Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on: 1. Key concepts and definitions with current understanding 2. Recent developments and latest research (prioritize 2023-2024 sources) 3. Current applications and real-world implementations 4. Expert opinions and analysis from authoritative sources 5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available. Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Disease Characteristics Research Template

Target Disease

Disease Name: Osteochondritis of Tarsal/Metatarsal Bone
MONDO ID: (if available)
Category: Complex

Research Objectives

Please provide a comprehensive research report on Osteochondritis of Tarsal/Metatarsal Bone covering all of the disease characteristics listed below. This report will be used to populate a disease knowledge base entry. Be thorough and cite primary literature (PMID preferred) for all claims.

For each section, suggested databases/resources are listed. These are the first places you should search for information on each topic.

1. Disease Information

Search first: OMIM, Orphanet, ICD-10/ICD-11, MeSH, PubMed

What is the disease? Provide a concise overview.
What are the key identifiers? (OMIM, Orphanet, ICD-10/ICD-11, MeSH, Mondo)
What are the common synonyms and alternative names?
Is the information derived from individual patients (e.g., EHR) or aggregated disease-level resources?

2. Etiology

Disease Causal Factors: What are the primary causes? (genetic, environmental, infectious, mechanistic)
Risk Factors:

Search first: PubMed, Cochrane Library, UpToDate, clinical guidelines, ClinVar, ClinGen, GWAS Catalog, PheGenI, CTD, CDC, WHO, epidemiological databases
Genetic risk factors (causal variants, susceptibility loci, modifier genes)
Environmental risk factors (toxins, lifestyle, occupational exposures, age, sex, family history)
Protective Factors:

Search first: PubMed, Cochrane Library, clinical trial databases, GWAS Catalog, gnomAD, WHO, CDC, nutrition databases
Genetic protective factors (protective variants, modifier alleles)
Environmental protective factors (diet, lifestyle, exposures that reduce risk)
Gene-Environment Interactions: How do genetic and environmental factors interact to influence disease?

Search first: CTD, PubMed, PheGenI, GxE databases

3. Phenotypes

Search first: HPO (Human Phenotype Ontology), OMIM, Orphanet, PubMed, clinicaltrials.gov, MedDRA, SNOMED CT, DECIPHER, LOINC

For each phenotype, provide: - Phenotype type: symptoms, clinical signs, physical manifestations, behavioral changes, or laboratory abnormalities

For symptoms/signs: HPO, OMIM, Orphanet, PubMed For behavioral changes: HPO, DSM, RDoC (Research Domain Criteria), PubMed For laboratory abnormalities: LOINC, SNOMED CT, LabTests Online, PubMed - Phenotype characteristics: Search first: OMIM, Orphanet, HPO, PubMed - Age of symptom onset (neonatal, childhood, adult-onset, late-onset) - Symptom severity (mild, moderate, severe, variable) - Symptom progression (stable, progressive, episodic, fluctuating) - Frequency among affected individuals (percentage or qualitative) - Quality of life impact: Effects on daily functioning and well-being (per-phenotype when possible) Search first: EQ-5D database, SF-36, WHO QOL databases, PubMed - Suggest HPO (Human Phenotype Ontology) terms for each phenotype

4. Genetic/Molecular Information

Causal Genes: Gene mutations or chromosomal abnormalities responsible for disease (gene symbols, OMIM IDs)

Search first: OMIM, ClinVar, HGMD, Ensembl, NCBI Gene
Pathogenic Variants:
Affected genes (gene symbols, HGNC IDs) > Search first: OMIM, NCBI Gene, Ensembl, HGNC, UniProt, GeneCards
Variant classification (pathogenic, likely pathogenic, VUS per ACMG/AMP guidelines) > Search first: ClinVar, ClinGen, ACMG/AMP guidelines, VarSome
Variant type/class (missense, frameshift, nonsense, splice-site, structural)
Allele frequency in population databases > Search first: gnomAD, 1000 Genomes, ExAC, TOPMed, dbSNP
Somatic vs germline origin > Search first: COSMIC (somatic), ClinVar, ICGC, TCGA
Functional consequences (loss of function, gain of function, dominant negative)
Modifier Genes: Genes that modify disease severity or expression
Epigenetic Information: DNA methylation, histone modifications, chromatin changes affecting disease

Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth
Chromosomal Abnormalities: Large-scale genetic changes (aneuploidy, translocations, inversions)

Search first: DECIPHER, ClinVar, ECARUCA, UCSC Genome Browser

5. Environmental Information

Environmental Factors: Non-genetic contributing factors (toxins, radiation, pollution, occupational exposure)

Search first: CTD (Comparative Toxicogenomics Database), TOXNET, PubMed, EPA databases
Lifestyle Factors: Behavioral factors (smoking, diet, exercise, alcohol consumption)

Search first: CDC databases, WHO, PubMed, NHANES
Infectious Agents: If applicable, pathogens causing or triggering disease (bacteria, viruses, fungi, parasites)

Search first: NCBI Taxonomy, ViPR, BV-BRC, MicrobeDB, GIDEON

6. Mechanism / Pathophysiology

Molecular Pathways: Specific signaling cascades or biochemical pathways involved (Wnt, MAPK, mTOR, PI3K-AKT, etc.)

Search first: KEGG, Reactome, WikiPathways, PathBank, BioCyc
Cellular Processes: Cell-level mechanisms (apoptosis, autophagy, cell cycle dysregulation, inflammation, etc.)

Search first: Gene Ontology (GO), Reactome, KEGG, PubMed
Protein Dysfunction: How protein structure or function is altered (misfolding, aggregation, loss of function, gain of function)

Search first: UniProt, PDB (Protein Data Bank), InterPro, Pfam, AlphaFold
Metabolic Changes: Alterations in metabolic processes (energy metabolism, lipid metabolism, amino acid metabolism)

Search first: KEGG, BioCyc, HMDB (Human Metabolome Database), BRENDA
Immune System Involvement: Role of immune response (autoimmunity, immunodeficiency, chronic inflammation)

Search first: ImmPort, Immunome Database, IEDB, Gene Ontology
Tissue Damage Mechanisms: How tissues/ are injured (oxidative stress, ischemia, fibrosis, necrosis)

Search first: PubMed, Gene Ontology, Reactome
Biochemical Abnormalities: Specific molecular defects (enzyme deficiencies, receptor dysfunction, ion channel defects)

Search first: BRENDA, UniProt, KEGG, OMIM, PubMed
Epigenetic Changes: DNA methylation, histone modifications affecting gene expression in disease

Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth
Molecular Profiling (if available):
Transcriptomics/gene expression changes > Search first: GEO (Gene Expression Omnibus), ArrayExpress, GTEx, Human Cell Atlas, SRA
Proteomics findings > Search first: PRIDE, ProteomeXchange, Human Protein Atlas, STRING, BioGRID
Metabolomics signatures > Search first: MetaboLights, Metabolomics Workbench, HMDB, METLIN
Lipidomics alterations > Search first: LIPID MAPS, SwissLipids, LipidHome, Metabolomics Workbench
Genomic structural features > Search first: UCSC Genome Browser, Ensembl, NCBI, dbVar, DGV
Advanced Technologies (if applicable):
Single-cell analysis findings (cell-type specific mechanisms, cellular heterogeneity) > Search first: Human Cell Atlas, Single Cell Portal, GEO, CELLxGENE
Spatial transcriptomics findings > Search first: GEO, Spatial Research, Vizgen, 10x Genomics data
Multi-omics integration results > Search first: TCGA, ICGC, cBioPortal, LinkedOmics, PubMed
Functional genomics screens (CRISPR, RNAi) > Search first: DepMap, GenomeRNAi, PubMed, BioGRID ORCS

For each mechanism, describe: - The causal chain from initial trigger to clinical manifestation - Which mechanisms are upstream vs downstream - What cell types and biological processes are involved - Suggest GO terms for biological processes and CL terms for cell types

7. Anatomical Structures Affected

Organ Level:
Primary organs directly affected
Secondary organ involvement (complications, secondary effects)
Body systems involved (cardiovascular, nervous, digestive, respiratory, endocrine, etc.)

Search first: Uberon, FMA (Foundational Model of Anatomy), OMIM, HPO, ICD-11, MeSH, SNOMED CT
Tissue and Cell Level:
Specific tissue types affected (epithelial, connective, muscle, nervous)
Specific cell populations targeted (with Cell Ontology terms)

Search first: Uberon, Human Protein Atlas, Cell Ontology, Human Cell Atlas, CellMarker, PanglaoDB
Subcellular Level:
Cellular compartments involved (mitochondria, nucleus, ER, lysosomes) (with GO Cellular Component terms)

Search first: Gene Ontology (Cellular Component), UniProt, Human Protein Atlas
Localization:
Specific anatomical sites (with UBERON terms) > Search first: FMA, Uberon, NeuroNames (for brain), SNOMED CT
Lateralization (unilateral, bilateral, asymmetric) > Search first: HPO, clinical literature, imaging databases

8. Temporal Development

Onset:
Typical age of onset (congenital, pediatric, adult, geriatric)
Onset pattern (acute, subacute, chronic, insidious)

Search first: OMIM, Orphanet, HPO, PubMed
Progression:
Disease stages (early, intermediate, advanced, end-stage) > Search first: Cancer Staging Manual (AJCC), WHO classifications, PubMed
Progression rate (rapid, slow, variable)
Disease course pattern (episodic, relapsing-remitting, progressive, stable)
Disease duration (self-limited, chronic lifelong)

Search first: Disease registries, longitudinal cohort databases, natural history studies, PubMed, Orphanet, OMIM
Patterns:
Remission patterns (spontaneous, treatment-induced) > Search first: Clinical trial databases, disease registries, PubMed
Critical periods (time windows of vulnerability or opportunity for intervention) > Search first: PubMed, developmental biology databases, clinical guidelines

9. Inheritance and Population

Epidemiology:
Prevalence (cases per 100,000 at given time)
Incidence (new cases per 100,000 per year)

Search first: Orphanet, CDC, WHO, GBD (Global Burden of Disease), national registries, SEER, disease registries
For Genetic Etiology:
Inheritance pattern (AD, AR, X-linked, mitochondrial, multifactorial, polygenic) > Search first: OMIM, Orphanet, ClinVar, GTR (Genetic Testing Registry)
Penetrance (complete, incomplete, age-dependent) > Search first: ClinVar, OMIM, PubMed, ClinGen
Expressivity (variable, consistent) > Search first: OMIM, ClinVar, PubMed
Genetic anticipation (increasing severity in successive generations) > Search first: OMIM, PubMed (especially for repeat expansion disorders)
Germline mosaicism > Search first: ClinVar, OMIM, genetic counseling literature, PubMed
Founder effects (population-specific mutations) > Search first: gnomAD, population genetics databases, PubMed
Consanguinity role > Search first: OMIM, population studies, genetic counseling resources
Carrier frequency > Search first: gnomAD, carrier screening databases, GeneReviews, GTR
Population Demographics:
Affected populations (ethnic or demographic groups with higher prevalence) > Search first: gnomAD, 1000 Genomes, PAGE Study, PubMed, population registries
Geographic distribution (endemic areas, regional variation) > Search first: WHO, CDC, GBD, Orphanet, geographic epidemiology databases
Geographic distribution of specific variants
Sex ratio (male:female) > Search first: Disease registries, OMIM, PubMed, epidemiological databases
Age distribution of affected individuals > Search first: CDC, disease registries, SEER, Orphanet

10. Diagnostics

Clinical Tests:
Laboratory tests (blood, urine, tissue chemistry, specific enzyme assays) > Search first: LOINC, LabTests Online, PubMed
Biomarkers (proteins, metabolites, genetic markers, circulating biomarkers) > Search first: FDA Biomarker List, BEST (Biomarkers, EndpointS, and other Tools), PubMed
Imaging studies (X-ray, CT, MRI, PET, ultrasound) > Search first: RadLex, DICOM, Radiopaedia, imaging databases
Functional tests (pulmonary function, cardiac stress tests) > Search first: LOINC, clinical guidelines, PubMed
Electrophysiology (EEG, EMG, ECG, nerve conduction studies) > Search first: LOINC, clinical neurophysiology databases, PubMed
Biopsy findings (histopathology, immunohistochemistry) > Search first: SNOMED CT, College of American Pathologists resources, PubMed
Pathology findings (microscopic examination) > Search first: SNOMED CT, Digital Pathology databases, PubMed
Genetic Testing:

Search first: GTR (Genetic Testing Registry), GeneReviews, ClinGen
Overview of recommended genetic testing approach
Whole genome sequencing (WGS) utility > Search first: GTR, ClinVar, GEL (Genomics England), gnomAD
Whole exome sequencing (WES) utility > Search first: GTR, ClinVar, OMIM, GeneMatcher
Gene panels (which panels, which genes) > Search first: GTR, ClinVar, laboratory-specific databases
Single gene testing > Search first: GTR, ClinVar, OMIM, GeneReviews
Chromosomal microarray (CMA) > Search first: DECIPHER, ClinVar, dbVar, ECARUCA
Karyotyping > Search first: Chromosome Abnormality Database, ClinVar, cytogenetics resources
FISH > Search first: ClinVar, cytogenetics databases, PubMed
Mitochondrial DNA testing > Search first: MITOMAP, MSeqDR, ClinVar, GTR
Repeat expansion testing > Search first: GTR, ClinVar, repeat expansion databases, PubMed
Omics-Based Diagnostics (if applicable):
RNA sequencing / transcriptomics > Search first: GEO, ArrayExpress, GTEx, RNA-seq databases
Proteomics > Search first: PRIDE, ProteomeXchange, FDA Biomarker database
Metabolomics > Search first: MetaboLights, Metabolomics Workbench, HMDB
Epigenomics > Search first: GEO, ENCODE, Roadmap Epigenomics, MethBase
Liquid biopsy > Search first: COSMIC, ClinVar, liquid biopsy databases, PubMed
Clinical Criteria:
Standardized diagnostic criteria (DSM, ICD, society guidelines) > Search first: DSM-5, ICD-11, clinical society guidelines, UpToDate
Differential diagnosis (other conditions to rule out, with distinguishing features) > Search first: DynaMed, UpToDate, clinical decision support systems
Screening:
Screening methods for asymptomatic individuals (newborn screening, carrier screening, cascade screening) > Search first: ACMG recommendations, CDC newborn screening, GTR

11. Outcome/Prognosis

Survival and Mortality:
Survival rate (5-year, 10-year, overall) > Search first: SEER, cancer registries, disease-specific registries, PubMed
Life expectancy (with and without treatment if applicable) > Search first: Orphanet, disease registries, actuarial databases, PubMed
Mortality rate > Search first: CDC, WHO, GBD, national mortality databases
Disease-specific mortality (deaths directly attributable to disease) > Search first: Disease registries, CDC Wonder, GBD, PubMed
Morbidity and Function:
Morbidity (disease-related disability and health impacts) > Search first: GBD, WHO, disability databases, PubMed
Disability outcomes (long-term functional impairments) > Search first: ICF (International Classification of Functioning), disability registries
Quality of life measures (EQ-5D, SF-36, PROMIS, disease-specific tools) > Search first: EQ-5D database, SF-36, PROMIS, PubMed
Disease Course:
Complications (secondary problems: infections, organ failure, etc.) > Search first: ICD codes, disease registries, clinical databases, PubMed
Recovery potential (likelihood and extent of recovery, with vs without treatment) > Search first: Natural history studies, rehabilitation databases, PubMed
Prediction:
Prognostic factors (age, disease severity, biomarkers, treatment response) > Search first: Prognostic models databases, clinical calculators, PubMed
Prognostic biomarkers (molecular markers predicting disease course) > Search first: FDA Biomarker database, PubMed, cancer prognostic databases

12. Treatment

Pharmacotherapy:
Pharmacological treatments (drug names, drug classes, mechanisms of action) > Search first: DrugBank, RxNorm, ATC classification, DailyMed, FDA databases
Pharmacogenomics (how genetic variants affect drug metabolism, efficacy, toxicity) > Search first: PharmGKB, CPIC (Clinical Pharmacogenetics), FDA Table of PGx Biomarkers
Advanced Therapeutics:
Gene therapy (viral vectors, CRISPR, gene replacement, gene editing) > Search first: ClinicalTrials.gov, FDA gene therapy database, ASGCT resources
Cell therapy (stem cell transplant, CAR-T, cellular therapeutics) > Search first: ClinicalTrials.gov, FDA cell therapy database, FACT standards
RNA-based therapies (ASOs, siRNA, mRNA therapies) > Search first: ClinicalTrials.gov, FDA approvals, PubMed
Targeted therapies (treatments directed at specific molecular targets) > Search first: My Cancer Genome, OncoKB, ClinicalTrials.gov, FDA approvals
Immunotherapies (checkpoint inhibitors, monoclonal antibodies) > Search first: Cancer Immunotherapy Database, FDA approvals, ClinicalTrials.gov
Surgical and Interventional:
Surgical interventions (types of surgery, timing, outcomes) > Search first: CPT codes, surgical registries, clinical guidelines, PubMed
Supportive and Rehabilitative:
Supportive care (symptom management, pain control, nutrition) > Search first: Clinical guidelines, Cochrane Library, PubMed
Rehabilitation (physical therapy, occupational therapy, speech therapy) > Search first: Rehabilitation medicine databases, clinical guidelines, PubMed
Experimental:
Experimental treatments in clinical trials (with NCT identifiers if available) > Search first: ClinicalTrials.gov, EU Clinical Trials Register, WHO ICTRP
Treatment Outcomes:
Treatment response rates > Search first: Clinical trial databases, FDA reviews, systematic reviews, PubMed
Side effects and adverse events > Search first: FDA Adverse Event Reporting System (FAERS), MedWatch, PubMed
Treatment Strategy:
Treatment algorithms (clinical pathways, decision trees) > Search first: Clinical practice guidelines, NCCN Guidelines, UpToDate
Combination therapies > Search first: ClinicalTrials.gov, treatment guidelines, PubMed
Personalized medicine approaches (genotype-guided treatment) > Search first: My Cancer Genome, CIViC, PharmGKB, precision medicine databases

For each treatment, suggest MAXO (Medical Action Ontology) terms where applicable.

13. Prevention

Prevention Levels:
Primary prevention (preventing disease occurrence: vaccination, risk factor modification) > Search first: CDC, WHO, USPSTF recommendations, Cochrane Library
Secondary prevention (early detection and treatment: screening programs, early intervention) > Search first: USPSTF, CDC screening guidelines, WHO
Tertiary prevention (preventing complications in those with disease) > Search first: Clinical guidelines, disease management protocols, PubMed
Immunization: Vaccine strategies (if applicable)

Search first: CDC vaccine schedules, WHO immunization, FDA vaccine database
Screening and Early Detection:
Screening programs (population-based: newborn screening, cancer screening) > Search first: CDC screening programs, USPSTF, cancer screening databases
Genetic screening (carrier screening, preimplantation genetic diagnosis, prenatal testing) > Search first: ACMG recommendations, ACOG guidelines, GTR
Risk stratification (identifying high-risk individuals for targeted prevention) > Search first: Risk prediction models, clinical calculators, PubMed
Behavioral Interventions: Lifestyle modifications to reduce risk

Search first: CDC, WHO, behavioral intervention databases, Cochrane Library
Counseling: Genetic counseling (risk assessment, family planning guidance)

Search first: NSGC resources, ACMG guidelines, GeneReviews
Public Health:
Public health interventions (sanitation, vector control, health education) > Search first: CDC, WHO, public health databases, PubMed
Environmental interventions (reducing environmental risk factors) > Search first: EPA databases, WHO environmental health, PubMed
Prophylaxis: Preventive medications or procedures

Search first: Clinical guidelines, FDA approvals, PubMed

14. Other Species / Natural Disease

Taxonomy: Species affected (with NCBI Taxon identifiers)

Search first: NCBI Taxonomy
Breed: Specific breeds affected (with VBO identifiers if applicable)

Search first: VBO (Vertebrate Breed Ontology)
Gene: Orthologous genes in other species (with NCBI Gene IDs)

Search first: NCBI Gene
Natural Disease:
Naturally occurring disease in other species (companion animals, wildlife) > Search first: OMIA (Online Mendelian Inheritance in Animals), VetCompass, PubMed
Veterinary relevance and importance in animal health > Search first: OMIA, veterinary databases, PubMed
Comparative Biology:
Comparative pathology (similarities and differences across species) > Search first: OMIA, comparative pathology databases, PubMed
Evolutionary conservation of disease mechanisms > Search first: HomoloGene, OrthoMCL, Alliance of Genome Resources
Transmission (if applicable):
Zoonotic potential > Search first: CDC zoonotic diseases, WHO zoonoses, GIDEON
Cross-species susceptibility > Search first: NCBI Taxonomy, veterinary databases, PubMed

15. Model Organisms

Model Types:
Model organism type (mammalian, invertebrate, cellular, in vitro) > Search first: Alliance of Genome Resources, model organism databases
Specific model systems (mouse, rat, zebrafish, Drosophila, C. elegans, yeast, cell lines, organoids, iPSCs) > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, SGD, ATCC, Cellosaurus
Induced models (drug treatment, surgical intervention, environmental manipulation) > Search first: MGI, model organism databases, PubMed
Genetic Models:
Types available (knockout, knock-in, transgenic, conditional, humanized) > Search first: MGI, IMPC, KOMP, EuMMCR, IMSR
Model Characteristics:
Phenotype recapitulation (how well model reproduces human disease features) > Search first: Model organism databases, comparative studies, PubMed
Model limitations (aspects of human disease not captured) > Search first: Model organism databases, PubMed, review articles
Applications:
Research applications (what aspects of disease can be studied) > Search first: Model organism databases, PubMed
Resources:
Model databases > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, IMSR, EMMA, MMRRC

Citation Requirements

Cite primary literature (PMID preferred) for all mechanistic and clinical claims
Prioritize recent reviews and landmark papers
Include direct quotes from abstracts where possible to support key statements
Distinguish evidence source types: human clinical, model organism, in vitro, computational

Output Format

Structure your response as a comprehensive narrative organized by the sections above. For each section, provide: - Factual content with specific details (numbers, percentages, gene names, variant nomenclature) - Ontology term suggestions (HPO, GO, CL, UBERON, CHEBI, MAXO, MONDO) where applicable - Evidence citations with PMIDs - Direct quotes from abstracts to support key claims - Clear indication when information is not available or not applicable for this disease

This report will be used to populate a disease knowledge base entry with: - Pathophysiology descriptions with causal chains - Gene/protein annotations (HGNC, GO terms) - Phenotype associations (HP terms) with frequencies - Cell type involvement (CL terms) - Anatomical locations (UBERON terms) - Chemical entities (CHEBI terms) - Treatment annotations (MAXO terms) - Evidence items with PMIDs and exact abstract quotes - Epidemiology, prognosis, diagnostic, and prevention information - Animal model descriptions with phenotype recapitulation details

Comprehensive disease characteristics report: Osteochondritis/Osteochondrosis of tarsal/metatarsal bone

Scope and entity mapping (important nosology note)

The umbrella phrase “osteochondritis of tarsal/metatarsal bone” is not a single well-defined disease entity in the retrieved literature; rather, it most consistently maps to a group of osteochondroses/osteonecroses affecting (i) the tarsal navicular in children (Köhler disease), (ii) the metatarsal head (classically the 2nd) in adolescents (Freiberg disease / Freiberg infraction), and (iii) the tarsal navicular in adults (Müller–Weiss disease, spontaneous adult navicular osteonecrosis). (liu2024footpainin pages 8-10, goncalvesdos2024necrosisavasculardel pages 2-4, maruszczak2024lowerlimbosteochondrosis pages 9-10)

Because no ontology/terminology databases (MONDO/Orphanet/MeSH/ICD) were directly queried in the available toolchain for this run, definitive MONDO IDs, MeSH IDs, Orphanet IDs, and ICD-10/ICD-11 codes could not be verified from primary evidence in the retrieved texts. The report therefore focuses on evidence-backed clinical entities and their characteristics.

Table (click to expand)

Entity	Primary bone/joint	Typical age	Sex predominance	Key synonyms	Key imaging features	Notes on etiology/risk factors	Key sources with DOI and year
Freiberg disease	Usually 2nd metatarsal head / 2nd metatarsophalangeal joint; less often 3rd, 4th metatarsal head	Adolescence; often adolescent athletes	Female predominance; reported ~5:1 female:male	Freiberg infraction; osteochondrosis/avascular necrosis of the metatarsal head	Radiographs: widening of MTP joint, then subchondral flattening/collapse, sclerosis, fragmentation; MRI: bone marrow edema and subchondral/cartilage defects; US: flattened/fragmented metatarsal head, irregular bony surface, synovial hyperplasia/effusion	Multifactorial; trauma/repetitive microtrauma, mechanical overload, possible vascular insufficiency/watershed supply, mechanical arterial compression; associated systemic disorders reported include hypercoagulability, SLE, diabetes	Carmont et al., 2009, DOI: 10.3113/fai-2009-0167; Kim et al., 2024, DOI: 10.7547/22-025; Liu et al., 2024, DOI: 10.14366/usg.24002 (liu2024footpainin pages 8-10, kim2024shorttermoutcomesof pages 1-2, carmont2009currentconceptsreview pages 1-2)
Köhler disease	Tarsal navicular	Usually children; commonly 4–7 years; also described in children <10 years	Male predominance; boys affected about 4 times more often; bilateral in up to 25%	Köhler’s disease; navicular osteochondrosis; avascular necrosis of the navicular in childhood	Radiographs: wafer-thin navicular, bony collapse, fragmentation, patchy sclerosis/increased radiodensity, flattening and loss of normal trabecular pattern; US: unsmooth/bumpy/fragmented navicular ossification center, possible deformity	Self-limited osteochondrosis in skeletally immature children; thought related to delayed/late ossification with increased mechanical compression/loading before complete ossification; trauma and ischemia also implicated	Maruszczak et al., 2024, DOI: 10.3390/app142411795; Liu et al., 2024, DOI: 10.14366/usg.24002; Steinborn & Glaser, 2019, DOI: 10.1055/s-0039-1695721 (liu2024footpainin pages 1-2, steinborn2019normalvariationsand pages 1-2, maruszczak2024lowerlimbosteochondrosis pages 9-10)
Müller-Weiss disease	Adult tarsal navicular / midfoot	Adults, typically 4th–6th decades; many diagnosed in 4th–5th decades	Female predominance; about 70% female in reviewed series	Müller-Weiss disease; spontaneous osteonecrosis/avascular necrosis of the navicular	Radiographs: condensation/sclerosis, fragmentation, dorsolateral fragmentation, deformity; may show osteophytes and paradoxical flatfoot; MRI may mimic osteonecrosis	Rare adult navicular osteonecrosis; proposed factors include delayed ossification plus abnormal force distribution, vascular compromise, bone dysplasia/uneven compressive stress, trauma/stress fracture history, childhood physical/nutritional stress; may be unilateral or bilateral	Gonçalves-dos Santos et al., 2024, DOI: 10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4, santos2024avascularnecrosisof pages 1-2)

Table: This table maps the umbrella concept of osteochondritis/osteochondrosis affecting tarsal or metatarsal bones to the main clinical entities encountered in practice. It summarizes age/sex patterns, synonymous names, imaging hallmarks, and supported etiologic notes using only the gathered evidence.

1. Disease information

1.1 Definitions (current understanding)

Freiberg disease (Freiberg infraction): described as osteochondrosis/avascular necrosis of the (usually) second metatarsal head, presenting at the metatarsophalangeal (MTP) joint. (liu2024footpainin pages 8-10, carmont2009currentconceptsreview pages 1-2)
Köhler disease: osteochondrosis/avascular necrosis of the tarsal navicular in children; described as a self-limited osteochondrosis of an ossification center in skeletally immature patients. (liu2024footpainin pages 1-2, tuthill2014imagingoftarsal pages 8-9, maruszczak2024lowerlimbosteochondrosis pages 9-10)
Müller–Weiss disease: adult navicular avascular necrosis/osteonecrosis characterized by deformation, fragmentation, and sclerosis/condensation of the navicular and associated midfoot pain and deformity patterns. (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4)

1.2 Synonyms / alternate names (examples from the literature)

Freiberg disease has multiple historical terms (e.g., “Kohler’s second disease”, “eggshell fracture”, “metatarsal epiphysitis”, “osteochondritis deformans metatarsojuvenilis”). (schade2015surgicalmanagementof pages 1-2, carmont2009currentconceptsreview pages 1-2)
Köhler disease is also explicitly called “avascular necrosis of the navicular bone” in a 2024 review. (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Müller–Weiss is consistently referred to as “avascular necrosis of the navicular” / “spontaneous osteonecrosis of the navicular” in 2024 systematic-review material. (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4, santos2024avascularnecrosisof pages 1-2)

1.3 Evidence source type

The retrieved evidence is mostly aggregated disease-level clinical literature (reviews and systematic reviews) plus a retrospective surgical cohort for Freiberg disease; it is not derived from EHR-scale datasets in the retrieved corpus. (goncalvesdos2024necrosisavasculardel pages 1-2, kim2024shorttermoutcomesof pages 1-2, schade2015surgicalmanagementof pages 1-2)

2. Etiology

2.1 Causal factors and risk factors

Freiberg disease - Etiology is described as multifactorial, with proposed roles for trauma/microtrauma, mechanical arterial compression, possible vascular “watershed” vulnerability, and systemic disorders including hypercoagulability, systemic lupus erythematosus, and diabetes. (liu2024footpainin pages 8-10, carmont2009currentconceptsreview pages 1-2) - Vascular anatomy studies in a systematic review context: one cadaveric study reported 65% of second metatarsals lacked a vascular branch from the first web-space artery; another noted the epiphysis is supplied by small vessels near the joint capsule, hypothesized to be vulnerable to compression. (schade2015surgicalmanagementof pages 1-2)

Köhler disease - 2024 review synthesis suggests the likely driver is increased mechanical compression/loading of the navicular before complete ossification, disrupting blood supply and leading to ischemia/avascular necrosis; trauma is also discussed as a possible contributor. (maruszczak2024lowerlimbosteochondrosis pages 9-10)

Müller–Weiss disease - Proposed etiologies in a 2024 systematic review include: delayed ossification plus abnormal force distribution, bone dysplasia/uneven compressive stress, and vascular compromise, with possible contributors such as intensive childhood physical stress, nutritional/environmental/metabolic factors, and trauma/stress fractures. (goncalvesdos2024necrosisavasculardel pages 1-2)

2.2 Protective factors / GxE

No specific protective genetic variants, environmental protective factors, or formal gene–environment interaction studies were identified in the retrieved evidence set.

3. Phenotypes

Across entities, pain and functional limitation are dominant, with entity-specific location and imaging findings.

Table (click to expand)

Entity	Phenotype (plain language)	Phenotype type (symptom/sign/imaging)	Typical onset/age	Frequency (if available)	Suggested HPO term(s) (best-effort)	Supporting citation (with DOI/year)
Freiberg disease	Forefoot chronic pain	Symptom	Adolescence; often adolescent athletic females	not reported	HP:0001836 Pain in the metatarsal region; HP:0001767 Foot pain	Liu et al., 2024, DOI:10.14366/usg.24002 (liu2024footpainin pages 8-10)
Freiberg disease	Swelling around the metatarsophalangeal joint	Sign	Adolescence	not reported	HP:0001389 Arthritis; HP:0011463 Swelling of joint	Liu et al., 2024, DOI:10.14366/usg.24002 (liu2024footpainin pages 8-10)
Freiberg disease	Tenderness over affected metatarsal head	Sign	Adolescence	not reported	HP:0033748 Tenderness	Liu et al., 2024, DOI:10.14366/usg.24002; Gillespie, 2010, DOI:10.1249/jsr.0b013e3181f19488 (liu2024footpainin pages 8-10, gillespie2010osteochondrosesandapophyseal pages 1-2)
Freiberg disease	Restricted metatarsophalangeal joint motion	Sign	Adolescence	not reported	HP:0031372 Reduced joint range of motion	Liu et al., 2024, DOI:10.14366/usg.24002 (liu2024footpainin pages 8-10)
Freiberg disease	Focal pain and tenderness	Symptom/sign	Adolescent girls	not reported	HP:0001767 Foot pain; HP:0033748 Tenderness	Reginelli et al., 2018, DOI:10.23750/abm.v89i1-s.7009 (steinborn2019normalvariationsand pages 1-2)
Freiberg disease	Widening of the MTP joint, followed by metatarsal head collapse and sclerosis on radiographs	Imaging	Adolescence	not reported	HP:0001363 Osteonecrosis; HP:0100807 Abnormality of the metatarsal bones	Gillespie, 2010, DOI:10.1249/jsr.0b013e3181f19488 (gillespie2010osteochondrosesandapophyseal pages 1-2)
Freiberg disease	Flattened/fragmented metatarsal head with rough irregular bony surface on ultrasound	Imaging	Adolescence	not reported	HP:0100807 Abnormality of the metatarsal bones; HP:0001363 Osteonecrosis	Liu et al., 2024, DOI:10.14366/usg.24002 (liu2024footpainin pages 8-10)
Freiberg disease	Bone marrow edema and subchondral/cartilage defects on MRI	Imaging	Adolescence to adulthood	not reported	HP:0011849 Abnormality of the epiphysis; HP:0001363 Osteonecrosis	Kim et al., 2024, DOI:10.7547/22-025 (kim2024shorttermoutcomesof pages 1-2)
Köhler disease	Dorsomedial midfoot pain	Symptom	Children, usually 4–7 years	not reported	HP:0001767 Foot pain	Maruszczak et al., 2024, DOI:10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Köhler disease	Local swelling over navicular region	Sign	Children, usually 4–7 years	not reported	HP:0001389 Arthritis; HP:0011463 Swelling of joint	Maruszczak et al., 2024, DOI:10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Köhler disease	Tenderness over navicular	Sign	Children <10 years; commonly 4–7 years	not reported	HP:0033748 Tenderness	Maruszczak et al., 2024, DOI:10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Köhler disease	Limp favoring the lateral side of the foot	Sign	Children, usually 4–7 years	not reported	HP:0002204 Abnormal gait; HP:0002515 Limping	Maruszczak et al., 2024, DOI:10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Köhler disease	Bilateral involvement	Sign/distribution	Children younger than 10 years	up to 25%	HP:0012832 Bilateral	Liu et al., 2024, DOI:10.14366/usg.24002 (liu2024footpainin pages 1-2)
Köhler disease	Unsmooth, bumpy, fragmented, sometimes deformed navicular ossification center on ultrasound	Imaging	Children younger than 10 years	not reported	HP:0000925 Abnormality of the skeletal system; HP:0011849 Abnormality of the epiphysis	Liu et al., 2024, DOI:10.14366/usg.24002 (liu2024footpainin pages 1-2)
Köhler disease	Wafer-thin navicular with collapse, fragmentation, patchy sclerosis, and increased radiodensity on radiographs	Imaging	Children, usually 4–7 years	not reported	HP:0001363 Osteonecrosis; HP:0000925 Abnormality of the skeletal system	Maruszczak et al., 2024, DOI:10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Köhler disease	Navicular flattening, increased density, and fragmentation on radiographs	Imaging	Children aged ~3–9 years	not reported	HP:0001363 Osteonecrosis; HP:0000925 Abnormality of the skeletal system	Steinborn & Glaser, 2019, DOI:10.1055/s-0039-1695721 (steinborn2019normalvariationsand pages 1-2)
Müller-Weiss disease	Chronic midfoot pain	Symptom	Adults, typically 4th–6th decades	not reported	HP:0001767 Foot pain	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 1-2)
Müller-Weiss disease	Long-term mechanical dorsal foot pain	Symptom	Adults, usually diagnosed in 4th–5th decades	not reported	HP:0001767 Foot pain	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)
Müller-Weiss disease	Midfoot varus deformity	Sign	Adults, 4th–6th decades	not reported	HP:0004689 Varus deformity of foot	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 1-2)
Müller-Weiss disease	Ankle instability	Sign/symptom	Adults	not reported	HP:0002141 Ankle instability	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)
Müller-Weiss disease	Reduced subtalar mobility	Sign	Adults	not reported	HP:0031372 Reduced joint range of motion	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)
Müller-Weiss disease	Peroneal tendonitis	Sign	Adults	not reported	HP:0100526 Tendinitis	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)
Müller-Weiss disease	Condensation/sclerosis and fragmentation of the navicular on radiographs	Imaging	Adults, 4th–6th decades	not reported	HP:0001363 Osteonecrosis; HP:0000925 Abnormality of the skeletal system	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 1-2, santos2024avascularnecrosisof pages 1-2)
Müller-Weiss disease	Osteophytes and dorsolateral fragmentation of the navicular	Imaging	Adults	not reported	HP:0002808 Osteophyte; HP:0001363 Osteonecrosis	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)
Müller-Weiss disease	Paradoxical flatfoot	Sign/imaging	Adults	not reported	HP:0001762 Flat feet	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)
Müller-Weiss disease	Bilateral or unilateral involvement	Sign/distribution	Adults	not reported	HP:0012832 Bilateral	Gonçalves-dos Santos et al., 2024, DOI:10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 2-4)

Table: This table summarizes key clinical and imaging phenotypes reported in context for Freiberg disease, Köhler disease, and Müller-Weiss disease. It is useful for building phenotype annotations and suggested HPO mappings while clearly marking where frequencies were not reported.

4. Genetic / molecular information

The pediatric imaging-focused review describes Freiberg’s disease etiology as including possible “genetic susceptibility” among multiple factors, but no specific genes/variants, inheritance patterns, or ClinVar-grade pathogenic variants were identified in the retrieved corpus. (liu2024footpainin pages 8-10)
Consequently, no causal genes can be asserted from the retrieved evidence. The current retrieved literature supports predominantly biomechanical/vascular/ossification-timing hypotheses rather than a monogenic etiology for these specific entities. (goncalvesdos2024necrosisavasculardel pages 1-2, maruszczak2024lowerlimbosteochondrosis pages 9-10, carmont2009currentconceptsreview pages 1-2)

5. Environmental information

The evidence base emphasizes mechanical load/repetitive stress and (for adult navicular osteonecrosis) systemic/metabolic contributors as possible factors, rather than discrete toxins or infectious causes. (goncalvesdos2024necrosisavasculardel pages 1-2, maruszczak2024lowerlimbosteochondrosis pages 9-10)

6. Mechanism / pathophysiology (causal chains)

6.1 Osteochondrosis as a process (general)

A sports-medicine review describes osteochondroses as “bone-cartilage conditions” associated with disturbed endochondral ossification and a typical sequence of necrosis → revascularization → granulation/invasion → osteoclast resorption → osteoid replacement and lamellar bone formation. (gillespie2010osteochondrosesandapophyseal pages 1-2)

6.2 Entity-specific mechanistic hypotheses

Freiberg disease: proposed chain includes repetitive microtrauma/overload in a vulnerable epiphysis during growth, plus compromised blood supply (e.g., anatomically variable arterial supply) leading to subchondral necrosis/structural collapse and degenerative changes. (carmont2009currentconceptsreview pages 1-2)
Köhler disease: mechanical compression/loading of the navicular during incomplete ossification is proposed to disrupt blood supply, causing ischemia and transient osteonecrosis with later resolution (self-limited course). (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Müller–Weiss disease: overload and compressive deformation of the navicular within the medial arch, plus vascular obstruction and stress fracture/trauma contributions, are proposed to lead to chronic fragmentation/deformity and arthritic changes with pain and gait alteration. (goncalvesdos2024necrosisavasculardel pages 2-4)

Suggested GO biological processes (best-effort, not explicitly asserted in retrieved texts): endochondral ossification; bone remodeling; angiogenesis; response to mechanical stress.

Suggested CL cell types (best-effort): osteoblast; osteoclast; chondrocyte; endothelial cell.

7. Anatomical structures affected

Freiberg: metatarsal head and MTP joint (classically 2nd). (carmont2009currentconceptsreview pages 1-2)
Köhler: tarsal navicular in the midfoot. (liu2024footpainin pages 1-2, maruszczak2024lowerlimbosteochondrosis pages 9-10)
Müller–Weiss: tarsal navicular with associated perinavicular arthritis and midfoot deformity (e.g., midfoot varus; paradoxical flatfoot). (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4)

UBERON suggestions (best-effort): navicular bone of foot; metatarsal bone; metatarsophalangeal joint; midfoot.

8. Temporal development

Köhler: pediatric onset (commonly ~4–7 years in 2024 review). (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Freiberg: onset typically during adolescence/skeletal growth; clinical series included Smillie stages I–V at treatment. (kim2024shorttermoutcomesof pages 1-2, carmont2009currentconceptsreview pages 1-2)
Müller–Weiss: adult onset/diagnosis primarily in 4th–6th decades; systematic review reports ages 28–69 with most patients >40. (goncalvesdos2024necrosisavasculardel pages 2-4)

9. Inheritance and population / epidemiology

9.1 Demographics (from retrieved sources)

Köhler: male predominance; bilateral involvement up to 25%. (liu2024footpainin pages 1-2)
Freiberg: strong predilection for adolescent athletic females; female:male ratio reported as ~5:1. (liu2024footpainin pages 8-10, carmont2009currentconceptsreview pages 1-2)
Müller–Weiss: systematic review across included studies reports 134 patients (138 feet) with female predominance ~70% and typical diagnosis in the 4th–5th decades. (goncalvesdos2024necrosisavasculardel pages 2-4)

9.2 Prevalence/incidence

No population-based prevalence/incidence estimates for these entities were identified in the retrieved evidence set.

10. Diagnostics

10.1 Imaging and clinical workup

Radiography is repeatedly identified as front-line for Köhler and Freiberg; Freiberg commonly uses radiographs for Smillie staging. (kim2024shorttermoutcomesof pages 2-6, maruszczak2024lowerlimbosteochondrosis pages 9-10)
MRI is emphasized for detecting bone marrow edema and subchondral/cartilage abnormalities (Freiberg), and for evaluating navicular osteonecrosis-like changes (Müller–Weiss). (liu2024footpainin pages 8-10, kim2024shorttermoutcomesof pages 2-6, goncalvesdos2024necrosisavasculardel pages 2-4)
High-frequency musculoskeletal ultrasound is described as a useful pediatric modality for diagnosis and monitoring, capable of visualizing bone surfaces and adjacent soft tissues in real time; ultrasonographic patterns are described for Köhler and Freiberg. (liu2024footpainin pages 1-2, liu2024footpainin pages 8-10)

10.2 Freiberg staging/classification (Smillie)

A 2024 retrospective arthroscopy cohort restates Smillie I–V definitions (I fissure+sclerosis; II cancellous absorption with dorsal sinking; III absorption with bony projections; IV loose body; V arthrosis with flattening/deformity) and reports surgical outcomes across stages. (kim2024shorttermoutcomesof pages 1-2)

11. Outcome / prognosis

Köhler: characterized as self-limiting in a 2024 review, supporting a generally favorable prognosis with conservative management. (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Freiberg: surgical literature suggests many procedures can relieve pain and restore activity; systematic review notes joint-sparing procedures are reported more often and appear to have better prognosis for symptom resolution and return to activity. (schade2015surgicalmanagementof pages 1-2)
Müller–Weiss: chronic course with long-term mechanical pain; treatment selection is stage-dependent, and classification/consensus limitations are noted in 2024 systematic review material. (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4)

12. Treatment

A consolidated treatment-and-outcomes table is provided below.

Table (click to expand)

Entity	First-line diagnostics	Key staging/classification	Conservative treatments	Surgical options	Reported outcomes/statistics (with numbers, follow-up) when available	Suggested MAXO terms (best-effort)	Supporting citations
Freiberg disease	Plain radiographs for diagnosis and Smillie staging; follow-up radiographs; MRI to assess bone marrow edema, subchondral cortical irregularity, and cartilage defects; ultrasound can show flattened/fragmented metatarsal head, irregular bony surface, synovial hyperplasia, effusion, Doppler angiogenesis	Smillie I-V: I fissure+sclerosis; II cancellous absorption with dorsal cartilage sinking; III further absorption with medial/lateral projections; IV central loose body; V arthrosis with flattening/deformity	Rest, activity modification, footwear modification, orthosis/padding, NSAIDs, immobilization	Arthroscopic synovectomy/debridement/chondroplasty/microfracture; core decompression; debridement; perichondral grafting; dorsal closing-wedge osteotomy; osteochondral autologous transplantation (OAT); arthroplasty; metatarsal head restoration/resection	Arthroscopy series: 13 patients/15 feet, 12-month radiographs showed no progression; AOFAS improved from 39.67±5.04 pre-op to 93.07±1.83 at 12 months; VAS 7.20±1.42 to 1.80±0.41; ROM 33.67°±4.81° to 51.67°±5.23°; return to normal activities in 4-6 weeks (12-month follow-up) (kim2024shorttermoutcomesof pages 2-6, kim2024shorttermoutcomesof pages 6-7). Systematic review: 257 joint-sparing procedures, mean follow-up 30.4 months, >90% pain resolution/full return to activity; 70 joint-destructive procedures, mean follow-up 15.0 months, >70% pain resolution/full return to activity (schade2015surgicalmanagementof pages 1-2). Adult late-stage comparative study: OAT AOFAS 95.7 vs DCWMO 87.9 at final follow-up; fewer complications with OAT (kim2020comparisonofosteochondral pages 7-7)	MAXO: physical activity modification; orthopedic insole/orthotic use; NSAID therapy; immobilization/casting; arthroscopic debridement; microfracture surgery; osteotomy; osteochondral graft transplantation; arthroplasty	(liu2024footpainin pages 8-10, kim2024shorttermoutcomesof pages 1-2, schade2015surgicalmanagementof pages 1-2, kim2020comparisonofosteochondral pages 7-7, kim2024shorttermoutcomesof pages 2-6, kim2024shorttermoutcomesof pages 6-7)
Köhler disease	Radiographs are the diagnostic method of choice; ultrasound can show unsmooth/bumpy/fragmented or deformed navicular ossification center; CT or MRI if symptoms fail to improve or more detail is needed	No formal staging/classification identified in retrieved context	Rest, ice, firm-soled shoes, arch supports, non-weight-bearing crutches, immobilization with cast (~6 weeks) or controlled-ankle-motion shoe, NSAIDs	Usually no surgery indicated; refractory pediatric cases reported with navicular decompression and microcirculation reconstruction	Disease is self-limiting; bilateral involvement reported in up to 25% (diagnostic/epidemiologic statistic). Small surgical series: 3 pediatric patients had pain resolution within 3 months and restoration of navicular density after decompression/microcirculation reconstruction (liu2024footpainin pages 1-2, maruszczak2024lowerlimbosteochondrosis pages 9-10)	MAXO: rest; cryotherapy; shoe modification; arch support; assistive device use/crutches; non-weight-bearing; cast immobilization; NSAID therapy; navicular decompression surgery	(liu2024footpainin pages 1-2, maruszczak2024lowerlimbosteochondrosis pages 9-10)
Müller-Weiss disease	Radiographs showing osteophytes, sclerosis/condensation, fragmentation, dorsolateral navicular fragmentation; MRI when radiographs are equivocal and for osteonecrosis-like changes; functional assessment often with AOFAS and VAS in studies	Early vs advanced stages referenced; early stages noted as S1-S2 in review context, but no full staging scheme provided in retrieved text	Conservative treatment may be used in early stages; reported as giving acute symptomatic improvement and favorable evaluation in S1-S2; biomechanical offloading considerations implied by altered plantar pressures	Arthrodesis most common (isolated talonavicular, double, triple/perinavicular), calcaneal osteotomy, grafting	Systematic review included 17 studies with 134 patients (138 feet); ages 28-69 years; most >40 years; females ~70%; conservative treatment favorable in early S1-S2, surgery preferred in remaining stages; outcomes commonly measured with AOFAS and VAS, but pooled quantitative response rates not available in retrieved context (goncalvesdos2024necrosisavasculardel pages 2-4). Another review states isolated talonavicular arthrodesis gives good results in early stages, with double/triple arthrodesis used in advanced disease (goncalvesdos2024necrosisavasculardel pages 1-2, santos2024avascularnecrosisof pages 1-2)	MAXO: activity modification; analgesic/NSAID therapy; orthotic/offloading support; talonavicular arthrodesis; double arthrodesis; triple arthrodesis; calcaneal osteotomy; bone grafting	(goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4, santos2024avascularnecrosisof pages 1-2)

Table: This table summarizes diagnostic approaches, staging systems, conservative care, surgical options, and reported outcomes for Freiberg disease, Köhler disease, and Müller-Weiss disease. It is useful for comparing how these related tarsal/metatarsal osteochondroses are diagnosed and managed in current evidence.

Visual evidence from recent clinical series (Freiberg)

A cropped outcome table and outcome figure from the 2024 arthroscopic Freiberg series provide visual confirmation of the AOFAS/VAS/ROM improvements summarized in Artifact-02. (kim2024shorttermoutcomesof media 28b80a18, kim2024shorttermoutcomesof media 2d3231ac)

13. Prevention

No disease-specific primary prevention programs or screening protocols were identified in the retrieved evidence set. Practical prevention concepts implied by etiology include load management / activity modification and early evaluation of persistent forefoot/midfoot pain in at-risk groups (adolescent athletes; active children; adults with chronic midfoot pain). (liu2024footpainin pages 8-10, maruszczak2024lowerlimbosteochondrosis pages 9-10, goncalvesdos2024necrosisavasculardel pages 2-4)

14. Other species / natural disease

No veterinary/natural disease evidence specific to these tarsal/metatarsal entities was retrieved in this run.

15. Model organisms

No model-organism–based mechanistic studies specific to these entities were retrieved in this run.

Recent developments (2023–2024 emphasis)

Broader adoption/positioning of musculoskeletal ultrasound in pediatric foot pain evaluation (including osteochondroses such as Köhler and Freiberg) is emphasized in a 2024 review, highlighting real-time imaging and monitoring potential beyond radiography/MRI in young patients. Publication: May 2024; URL: https://doi.org/10.14366/usg.24002 (liu2024footpainin pages 1-2, liu2024footpainin pages 8-10)
Updated synthesis of lower-limb osteochondroses in young athletes includes a dedicated Köhler section with practical conservative treatment recommendations and radiographic hallmarks. Publication: Dec 2024; URL: https://doi.org/10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Stage-inclusive arthroscopic management data for Freiberg disease: a 2024 retrospective study reports significant improvements in validated clinical scores and motion at 12 months across Smillie stages, supporting arthroscopy (debridement/microfracture-based) as a real-world option even across radiographic stages (short-term evidence). Publication: May/June 2024; URL: https://doi.org/10.7547/22-025 (kim2024shorttermoutcomesof pages 2-6, kim2024shorttermoutcomesof pages 6-7)
Müller–Weiss evidence remains limited and heterogeneous: a 2024 systematic review notes limited studies, variable approaches, and the need for long-term outcomes/complication data; it also summarizes available demographic patterns (female predominance; typical 4th–6th decade). Publication: Jan 2024; URL: https://doi.org/10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4)

Expert opinion / evidence-quality considerations

The Freiberg systematic review concludes that joint-sparing procedures are more commonly reported and appear to have better prognosis for symptom resolution/return to activity, but also highlights inconsistency in staging usage (“Smillie stage was not consistently …”). This reflects a broader limitation: most data are case series and retrospective cohorts rather than randomized trials. (schade2015surgicalmanagementof pages 1-2)
For Müller–Weiss, the 2024 systematic review characterizes the disease as rare with small study samples and notes that additional classifications might be needed/validated, again reflecting evidence scarcity and the importance of standardized staging/outcome reporting. (goncalvesdos2024necrosisavasculardel pages 2-4)

Key statistics (from the retrieved evidence)

Köhler disease: bilateral involvement up to 25%. (liu2024footpainin pages 1-2)
Freiberg disease: female:male ratio reported ~5:1. (carmont2009currentconceptsreview pages 1-2)
Müller–Weiss systematic review: 134 patients (138 feet); age range 28–69; ~70% female. (goncalvesdos2024necrosisavasculardel pages 2-4)
Freiberg arthroscopy cohort (n=13 patients/15 feet): AOFAS improved 39.67±5.04 → 93.07±1.83 at 12 months; VAS 7.20±1.42 → 1.80±0.41; ROM 33.67°±4.81° → 51.67°±5.23°, P=.001. (kim2024shorttermoutcomesof pages 2-6, kim2024shorttermoutcomesof pages 6-7)
Freiberg systematic review: 257 joint-sparing procedures (mean follow-up 30.4 months) with >90% pain resolution/return to activity; 70 joint-destructive procedures (mean follow-up 15.0 months) with >70% pain resolution/return to activity. (schade2015surgicalmanagementof pages 1-2)

Evidence gaps relative to knowledge-base template

Ontology identifiers (MONDO/MeSH/ICD/Orphanet/OMIM): not extractable from the retrieved texts in this run.
Genetics/variants: no specific genes/variants identified; only nonspecific “genetic susceptibility” mentioned for Freiberg among multifactorial risk factors. (liu2024footpainin pages 8-10)
Incidence/prevalence: no population-level estimates found in retrieved evidence.
Clinical trials: no clearly relevant interventional trials were identified from the clinical-trials search results used in this run.

Primary source URL list (publication date when available)

Liu L, Wang T, Qi H. Ultrasonography May 2024. https://doi.org/10.14366/usg.24002 (liu2024footpainin pages 1-2, liu2024footpainin pages 8-10)
Maruszczak K, Madej T, Gawda P. Applied Sciences Dec 2024. https://doi.org/10.3390/app142411795 (maruszczak2024lowerlimbosteochondrosis pages 9-10)
Kim J-K et al. J Am Podiatr Med Assoc May/June 2024. https://doi.org/10.7547/22-025 (kim2024shorttermoutcomesof pages 2-6, kim2024shorttermoutcomesof pages 6-7)
Gonçalves-dos Santos R et al. Acta Ortopédica Mexicana Jan 2024. https://doi.org/10.35366/117381 (goncalvesdos2024necrosisavasculardel pages 1-2, goncalvesdos2024necrosisavasculardel pages 2-4)
Schade VL. Foot & Ankle Specialist May 2015. https://doi.org/10.1177/1938640015585966 (schade2015surgicalmanagementof pages 1-2)
Carmont MR et al. Foot & Ankle International Feb 2009. https://doi.org/10.3113/fai-2009-0167 (carmont2009currentconceptsreview pages 1-2)

PMID note: PMIDs were not present in the retrieved text excerpts for these articles; therefore PMID-based citations could not be provided from the available evidence context.

References

(liu2024footpainin pages 8-10): Lihua Liu, Tiezheng Wang, and Hengtao Qi. Foot pain in children and adolescents: a problem-based approach in musculoskeletal ultrasonography. Ultrasonography, 43:193-208, May 2024. URL: https://doi.org/10.14366/usg.24002, doi:10.14366/usg.24002. This article has 7 citations.
(goncalvesdos2024necrosisavasculardel pages 2-4): Santos R Gonçalves-dos, V. Furtuoso-Junior, W. L. Pinto de Barros-Moreira, A. Assunção-Tostes, F. Caixeta, and T. dos Santos-Carneiro. Necrosis avascular del navicular (müller-weiss). una revisión sistemática. Acta Ortopédica Mexicana, 38:333-339, Jan 2024. URL: https://doi.org/10.35366/117381, doi:10.35366/117381. This article has 0 citations.
(maruszczak2024lowerlimbosteochondrosis pages 9-10): Krystian Maruszczak, Tomasz Madej, and Piotr Gawda. Lower limb osteochondrosis and apophysitis in young athletes—a comprehensive review. Applied Sciences, 14:11795, Dec 2024. URL: https://doi.org/10.3390/app142411795, doi:10.3390/app142411795. This article has 2 citations.
(kim2024shorttermoutcomesof pages 1-2): Jong-Kil Kim, Do-Yeon Kim, Jong-Sung Oh, Dong-ill Ko, and Kwang-Bok Lee. Short-term outcomes of arthroscopic treatment of freiberg disease. Journal of the American Podiatric Medical Association, May 2024. URL: https://doi.org/10.7547/22-025, doi:10.7547/22-025. This article has 0 citations and is from a peer-reviewed journal.
(carmont2009currentconceptsreview pages 1-2): Michael R. Carmont, Robin J. Rees, and Christopher M. Blundell. Current concepts review: freiberg's disease. Foot & Ankle International, 30:167-176, Feb 2009. URL: https://doi.org/10.3113/fai-2009-0167, doi:10.3113/fai-2009-0167. This article has 139 citations and is from a peer-reviewed journal.
(liu2024footpainin pages 1-2): Lihua Liu, Tiezheng Wang, and Hengtao Qi. Foot pain in children and adolescents: a problem-based approach in musculoskeletal ultrasonography. Ultrasonography, 43:193-208, May 2024. URL: https://doi.org/10.14366/usg.24002, doi:10.14366/usg.24002. This article has 7 citations.
(steinborn2019normalvariationsand pages 1-2): Marc Steinborn and Christian Glaser. Normal variations and pathologic disorders of chondrification and ossification of the foot and related diseases. Seminars in Musculoskeletal Radiology, 23:497-510, Sep 2019. URL: https://doi.org/10.1055/s-0039-1695721, doi:10.1055/s-0039-1695721. This article has 7 citations and is from a peer-reviewed journal.
(goncalvesdos2024necrosisavasculardel pages 1-2): Santos R Gonçalves-dos, V. Furtuoso-Junior, W. L. Pinto de Barros-Moreira, A. Assunção-Tostes, F. Caixeta, and T. dos Santos-Carneiro. Necrosis avascular del navicular (müller-weiss). una revisión sistemática. Acta Ortopédica Mexicana, 38:333-339, Jan 2024. URL: https://doi.org/10.35366/117381, doi:10.35366/117381. This article has 0 citations.
(santos2024avascularnecrosisof pages 1-2): RG Santos, VF Furtuoso-Junior, and WL Moreira. Avascular necrosis of the navicular (müller-weiss). a systematic review. Unknown journal, 2024.
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(gillespie2010osteochondrosesandapophyseal pages 1-2): Heather Gillespie. Osteochondroses and apophyseal injuries of the foot in the young athlete. Current Sports Medicine Reports, 9:265-268, Sep 2010. URL: https://doi.org/10.1249/jsr.0b013e3181f19488, doi:10.1249/jsr.0b013e3181f19488. This article has 103 citations and is from a peer-reviewed journal.
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(kim2024shorttermoutcomesof pages 6-7): Jong-Kil Kim, Do-Yeon Kim, Jong-Sung Oh, Dong-ill Ko, and Kwang-Bok Lee. Short-term outcomes of arthroscopic treatment of freiberg disease. Journal of the American Podiatric Medical Association, May 2024. URL: https://doi.org/10.7547/22-025, doi:10.7547/22-025. This article has 0 citations and is from a peer-reviewed journal.
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(kim2024shorttermoutcomesof media 28b80a18): Jong-Kil Kim, Do-Yeon Kim, Jong-Sung Oh, Dong-ill Ko, and Kwang-Bok Lee. Short-term outcomes of arthroscopic treatment of freiberg disease. Journal of the American Podiatric Medical Association, May 2024. URL: https://doi.org/10.7547/22-025, doi:10.7547/22-025. This article has 0 citations and is from a peer-reviewed journal.
(kim2024shorttermoutcomesof media 2d3231ac): Jong-Kil Kim, Do-Yeon Kim, Jong-Sung Oh, Dong-ill Ko, and Kwang-Bok Lee. Short-term outcomes of arthroscopic treatment of freiberg disease. Journal of the American Podiatric Medical Association, May 2024. URL: https://doi.org/10.7547/22-025, doi:10.7547/22-025. This article has 0 citations and is from a peer-reviewed journal.