🔗

Mappings

MONDO

MONDO:0003816 articular cartilage disorder

MONDO has no specific term for a focal traumatic full-thickness articular cartilage defect of the knee. MONDO:0003816 (articular cartilage disorder) is the closest available broader parent, so the disease_term binding is a broadMatch rather than an exact match; a more specific MONDO term should be requested upstream.

⚙

Pathophysiology

4

Full-Thickness Chondral Injury

An acute traumatic shear/impact load, osteochondritis dissecans, or repetitive microtrauma produces a discrete full-thickness defect of the hyaline articular cartilage, disrupting the smooth load-bearing joint surface while leaving the surrounding cartilage relatively intact. The lesion may be purely chondral or osteochondral when it extends into the subchondral bone; because the cartilage and its supporting subchondral plate function together as an osteochondral unit, the extent of subchondral disease shapes both the mechanical consequences and the choice of restoration procedure.

Chondrocyte CL:0000138

extracellular matrix GO:0031012

articular cartilage UBERON:0010996 knee joint UBERON:0001465

Downstream

Impaired Intrinsic Cartilage Repair A full-thickness defect in avascular hyaline cartilage cannot recruit a normal vascular healing response.

Show evidence (2 references)

PMID:40964061 SUPPORT Human Clinical

"avascularity of articular cartilage and the limited ability to proliferate and promote repair"

Establishes the focal chondral lesion of the knee as a structural cartilage injury in a tissue with intrinsically limited repair capacity.

PMID:38534520 SUPPORT Human Clinical

"The management of OCL is predicated on certain injury characteristics, including lesion location and the extent of subchondral disease"

Confirms that lesion location and subchondral bone involvement define the osteochondral injury and drive management, supporting the chondral-versus-osteochondral distinction.

Impaired Intrinsic Cartilage Repair

Mature hyaline articular cartilage is avascular, alymphatic, and aneural, and its resident chondrocytes are entrapped in a dense matrix with little capacity to proliferate or migrate into a defect. Consequently a full-thickness chondral lesion has minimal intrinsic self-repair and the damage is frequently permanent.

Chondrocyte CL:0000138

cartilage development GO:0051216 ↓ DECREASED wound healing GO:0042060 ↓ DECREASED

articular cartilage UBERON:0010996

Downstream

Fibrocartilaginous Repair Tissue Formation In the absence of true hyaline regeneration, any spontaneous or marrow-derived fill is fibrocartilaginous rather than hyaline.

Progression to Secondary Osteoarthritis A persistent unrepaired surface defect alters joint load distribution and drives degenerative change.

Show evidence (1 reference)

PMID:28244303 SUPPORT Human Clinical

"Articular cartilage has very little capacity for self-repair, so damage may be permanent"

Directly supports the core mechanism that a focal full-thickness defect does not heal because of the limited intrinsic repair capacity of hyaline cartilage.

Fibrocartilaginous Repair Tissue Formation

When repair does occur — spontaneously or after marrow-stimulation procedures (microfracture, drilling, abrasion arthroplasty) — bone-marrow mesenchymal stromal cells populate the defect and produce type I collagen-rich fibrocartilage rather than type II collagen hyaline cartilage. This fibrocartilage is biomechanically inferior and degrades over time, so it does not durably restore the articular surface.

Marrow-derived mesenchymal stromal cell CL:0000134

extracellular matrix organization GO:0030198 ↑ INCREASED

extracellular matrix GO:0031012

Downstream

Progression to Secondary Osteoarthritis Inferior fibrocartilage degrades under load, leaving the joint surface vulnerable to degenerative progression.

Show evidence (1 reference)

PMID:9533054 SUPPORT Human Clinical

"produce only fibrocartilage and therefore do not offer a long-term cure"

Supports that marrow-stimulation repair of chondral defects yields biomechanically inferior fibrocartilage rather than durable hyaline cartilage.

Progression to Secondary Osteoarthritis

An untreated or inadequately repaired focal chondral defect concentrates mechanical stress on adjacent cartilage and subchondral bone, promoting progressive cartilage loss that converges on the degenerative phenotype of secondary osteoarthritis and may ultimately require joint replacement. This is post-traumatic osteoarthritis: the focal lesion is the discrete injury that imposes the abnormal mechanical loading and chondrocyte stress program captured by the conserved osteoarthritis degradation module, motivating early restoration of the articular surface.

Chondrocyte CL:0000138

response to mechanical stimulus GO:0009612 ↑ INCREASED cellular response to stress GO:0033554 ↑ INCREASED

articular cartilage UBERON:0010996

Show evidence (1 reference)

PMID:40964061 SUPPORT Human Clinical

"Untreated lesions can lead to early development of arthritis and the need for joint replacement"

Supports the causal link from an untreated focal cartilage defect to secondary osteoarthritis and eventual arthroplasty.

⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.

●

Phenotypes

4

Metabolism 1

Joint swelling Joint swelling HP:0001386

Musculoskeletal 2

Mechanical symptoms and restricted motion Limitation of joint mobility HP:0001376

Show evidence (1 reference)

PMID:34507359 SUPPORT Human Clinical

"can clinically translate into pain and dysfunction in young patients with high activity demands"

Focal chondral defects produce mechanical dysfunction and functional limitation of the knee in young, active patients.

Secondary osteoarthritis Osteoarthritis HP:0002758

Course: PROGRESSIVE

Show evidence (1 reference)

PMID:40964061 SUPPORT Human Clinical

"Untreated lesions can lead to early development of arthritis and the need for joint replacement"

Documents progression of untreated cartilage lesions to osteoarthritis.

Other 1

Activity-related knee pain Knee pain HP:0030839

Show evidence (3 references)

PMID:24714783 SUPPORT Human Clinical

"The mean KOOS pain and function subscores from baseline to 2 years were significantly more improved with MACI than with MFX"

Pain (KOOS pain) is a co-primary clinical manifestation of symptomatic knee cartilage defects and improves with cartilage repair.

PMID:34507359 SUPPORT Human Clinical

"Focal chondral defects (FCDs) of the knee can be a debilitating condition that can clinically translate into pain and dysfunction in young patients with high activity demands"

Establishes pain and dysfunction in young, active patients as the defining clinical presentation of focal chondral defects.

PMID:38534520 SUPPORT Human Clinical

"Osteochondral lesions (OCL) of the knee have long been acknowledged as significant sources of knee pain and functional deficits"

Independent review confirming knee pain and functional deficit as the core manifestations of focal osteochondral lesions.

💊

Medical Actions

4

Matrix-Applied Autologous Chondrocyte Implantation (MACI)

Action: cellular therapy MAXO:0000016

Agent: autologous cultured chondrocytes NCIT:C87436

Two-stage autologous cell therapy for symptomatic full-thickness cartilage defects of the knee. Chondrocytes are arthroscopically harvested, expanded in culture, and seeded onto a porcine type I/III collagen membrane that is implanted into the debrided defect to regenerate hyaline-like cartilage. In the randomized SUMMIT trial, MACI was clinically and statistically superior to microfracture for symptomatic defects of the knee. MACI is indicated for focal cartilage defects, not for generalized osteoarthritis.

Mechanism Target:

RESTORES Impaired Intrinsic Cartilage Repair — MACI implants cultured autologous chondrocytes to regenerate hyaline-like cartilage, directly compensating for the cartilage's failed intrinsic repair.

Show evidence (1 reference)

PMID:24714783 SUPPORT Human Clinical

"MACI offers a more efficacious alternative than MFX with a similar safety profile for the treatment of symptomatic articular cartilage defects of the knee"

Randomized controlled evidence that MACI is efficacious for symptomatic focal cartilage defects of the knee.

Microfracture (marrow stimulation)

Action: surgical procedure MAXO:0000004

A single-stage arthroscopic marrow-stimulation procedure in which small perforations are made in the subchondral bone to recruit marrow mesenchymal cells into the defect. It is technically simple and lower cost but produces biomechanically inferior fibrocartilage and is generally less durable than cell-based repair for larger defects.

Mechanism Target:

BYPASSES Impaired Intrinsic Cartilage Repair — Perforating the subchondral plate recruits marrow mesenchymal cells into the defect, bypassing the avascular cartilage's failed intrinsic repair, but the resulting fill is fibrocartilage.

Show evidence (1 reference)

PMID:9533054 PARTIAL Human Clinical

"produce only fibrocartilage and therefore do not offer a long-term cure"

Marrow-stimulation techniques relieve symptoms but generate fibrocartilage rather than durable hyaline repair.

Osteochondral Allograft Transplantation

Action: surgical procedure MAXO:0000004

Transplantation of size-matched donor osteochondral plugs (mature hyaline cartilage on a supporting bone base) into the debrided defect. It is a restorative option reserved for larger or deeper lesions and osteochondral defects involving the subchondral bone, where surface-based or marrow- stimulation techniques are less durable.

Mechanism Target:

RESTORES Full-Thickness Chondral Injury — A mature osteochondral graft physically replaces the defect, restoring the articular surface and, for osteochondral lesions, the underlying subchondral bone.

BYPASSES Impaired Intrinsic Cartilage Repair — Transplanting pre-formed mature hyaline cartilage bypasses the need for intrinsic repair the host cartilage cannot achieve.

Show evidence (1 reference)

PMID:34507359 SUPPORT Human Clinical

"chondral lesions that involve a larger area or depth require restorative procedures such as osteochondral allograft transplantation or other cell-based techniques"

Supports osteochondral allograft transplantation as the restorative approach for larger or deeper focal chondral lesions.

Osteochondral Autograft Transfer (OAT / mosaicplasty)

Action: surgical procedure MAXO:0000004

Transfer of one or more autologous osteochondral plugs harvested from a low-weightbearing region of the knee into the defect, restoring the surface with the patient's own mature hyaline cartilage. It is generally used for smaller focal osteochondral lesions. A 10-year randomized trial in athletes found OAT gave higher rates of return to and maintenance of preinjury-level sport than microfracture.

Mechanism Target:

RESTORES Full-Thickness Chondral Injury — Autologous osteochondral plugs physically restore the cartilage (and subchondral) surface at the defect.

BYPASSES Impaired Intrinsic Cartilage Repair — Grafting mature autologous hyaline cartilage bypasses the cartilage's failed intrinsic repair.

Show evidence (1 reference)

PMID:23024150 SUPPORT Human Clinical

"The OAT technique for ACD or OCD repair in the athletic population allows for a higher rate of return to and maintenance of sports at the preinjury level compared with MF"

A 10-year randomized controlled trial supports osteochondral autograft transfer as superior to microfracture for return to sport after focal osteochondral defects.

{ }

Source YAML

click to show

name: Focal Articular Cartilage Defect of the Knee
creation_date: "2026-06-12T16:10:00Z"
category: Acquired Musculoskeletal Disorder
disease_term:
  term:
    id: MONDO:0003816
    label: articular cartilage disorder
  preferred_term: Focal articular cartilage defect of the knee
description: >-
  A focal articular cartilage defect of the knee is a discrete, full-thickness
  lesion of the hyaline articular cartilage of the femoral condyle, trochlea, or
  patella, typically arising from acute traumatic injury, osteochondritis
  dissecans, or repetitive mechanical overload. Unlike osteoarthritis — a
  diffuse, degenerative whole-joint disease — a focal chondral defect is a
  localized structural injury surrounded by relatively healthy cartilage.
  Because mature hyaline cartilage is avascular and aneural and its chondrocytes
  have minimal proliferative or migratory capacity, a full-thickness defect does
  not heal spontaneously: it either persists or fills with biomechanically
  inferior fibrocartilage. The unrepaired or poorly repaired surface produces
  symptomatic mechanical dysfunction and is a recognized driver of progression
  to secondary osteoarthritis. This entry is distinct from the degenerative
  osteoarthritis entry and is the lesion targeted by cartilage-restoration
  procedures such as matrix-applied autologous chondrocyte implantation (MACI)
  and marrow-stimulation techniques.
parents:
- Articular cartilage disorder
mappings:
  mondo_mappings:
  - term:
      id: MONDO:0003816
      label: articular cartilage disorder
    mapping_predicate: skos:broadMatch
    mapping_source: manual curation
    mapping_justification: >-
      MONDO has no specific term for a focal traumatic full-thickness articular
      cartilage defect of the knee. MONDO:0003816 (articular cartilage disorder)
      is the closest available broader parent, so the disease_term binding is a
      broadMatch rather than an exact match; a more specific MONDO term should be
      requested upstream.
prevalence:
- population: Focal chondral defects requiring surgery (United States)
  notes: >-
    Focal chondral defects of the knee are common and impose a substantial
    surgical burden, with approximately 200,000 procedures performed annually in
    the United States.
  evidence:
  - reference: PMID:34507359
    reference_title: "The Large Focal Isolated Chondral Lesion."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "the number of surgical procedures performed for FCDs, which is now approximately 200,000 annually"
    explanation: Quantifies the surgical burden of focal chondral defects of the knee.
pathophysiology:
- name: Full-Thickness Chondral Injury
  description: >-
    An acute traumatic shear/impact load, osteochondritis dissecans, or
    repetitive microtrauma produces a discrete full-thickness defect of the
    hyaline articular cartilage, disrupting the smooth load-bearing joint surface
    while leaving the surrounding cartilage relatively intact. The lesion may be
    purely chondral or osteochondral when it extends into the subchondral bone;
    because the cartilage and its supporting subchondral plate function together
    as an osteochondral unit, the extent of subchondral disease shapes both the
    mechanical consequences and the choice of restoration procedure.
  cell_types:
  - preferred_term: Chondrocyte
    term:
      id: CL:0000138
      label: chondrocyte
  locations:
  - preferred_term: articular cartilage
    term:
      id: UBERON:0010996
      label: articular cartilage of joint
  - preferred_term: knee joint
    term:
      id: UBERON:0001465
      label: knee
  cellular_components:
  - preferred_term: extracellular matrix
    term:
      id: GO:0031012
      label: extracellular matrix
  evidence:
  - reference: PMID:40964061
    reference_title: "Cartilage Conundrum: Investigating Outcomes in Knee Cartilage Restoration Techniques."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "avascularity of articular cartilage and the limited ability to proliferate and promote repair"
    explanation: Establishes the focal chondral lesion of the knee as a structural cartilage injury in a tissue with intrinsically limited repair capacity.
  - reference: PMID:38534520
    reference_title: "Knee Joint Preservation in Tactical Athletes: A Comprehensive Approach Based upon Lesion Location and Restoration of the Osteochondral Unit."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The management of OCL is predicated on certain injury characteristics, including lesion location and the extent of subchondral disease"
    explanation: Confirms that lesion location and subchondral bone involvement define the osteochondral injury and drive management, supporting the chondral-versus-osteochondral distinction.
    images:
    - Focal_Articular_Cartilage_Defect_of_the_Knee-deep-research-falcon_artifacts/image-1.png
  downstream:
  - target: Impaired Intrinsic Cartilage Repair
    description: A full-thickness defect in avascular hyaline cartilage cannot recruit a normal vascular healing response.
- name: Impaired Intrinsic Cartilage Repair
  description: >-
    Mature hyaline articular cartilage is avascular, alymphatic, and aneural,
    and its resident chondrocytes are entrapped in a dense matrix with little
    capacity to proliferate or migrate into a defect. Consequently a
    full-thickness chondral lesion has minimal intrinsic self-repair and the
    damage is frequently permanent.
  cell_types:
  - preferred_term: Chondrocyte
    term:
      id: CL:0000138
      label: chondrocyte
  locations:
  - preferred_term: articular cartilage
    term:
      id: UBERON:0010996
      label: articular cartilage of joint
  biological_processes:
  - preferred_term: cartilage development
    term:
      id: GO:0051216
      label: cartilage development
    modifier: DECREASED
  - preferred_term: wound healing
    term:
      id: GO:0042060
      label: wound healing
    modifier: DECREASED
  evidence:
  - reference: PMID:28244303
    reference_title: "Autologous chondrocyte implantation in the knee: systematic review and economic evaluation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Articular cartilage has very little capacity for self-repair, so damage may be permanent"
    explanation: Directly supports the core mechanism that a focal full-thickness defect does not heal because of the limited intrinsic repair capacity of hyaline cartilage.
  downstream:
  - target: Fibrocartilaginous Repair Tissue Formation
    description: In the absence of true hyaline regeneration, any spontaneous or marrow-derived fill is fibrocartilaginous rather than hyaline.
  - target: Progression to Secondary Osteoarthritis
    description: A persistent unrepaired surface defect alters joint load distribution and drives degenerative change.
- name: Fibrocartilaginous Repair Tissue Formation
  description: >-
    When repair does occur — spontaneously or after marrow-stimulation
    procedures (microfracture, drilling, abrasion arthroplasty) — bone-marrow
    mesenchymal stromal cells populate the defect and produce type I
    collagen-rich fibrocartilage rather than type II collagen hyaline cartilage.
    This fibrocartilage is biomechanically inferior and degrades over time, so
    it does not durably restore the articular surface.
  cell_types:
  - preferred_term: Marrow-derived mesenchymal stromal cell
    term:
      id: CL:0000134
      label: mesenchymal stem cell
  cellular_components:
  - preferred_term: extracellular matrix
    term:
      id: GO:0031012
      label: extracellular matrix
  biological_processes:
  - preferred_term: extracellular matrix organization
    term:
      id: GO:0030198
      label: extracellular matrix organization
    modifier: INCREASED
  evidence:
  - reference: PMID:9533054
    reference_title: "Current treatment options for the restoration of articular cartilage."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "produce only fibrocartilage and therefore do not offer a long-term cure"
    explanation: Supports that marrow-stimulation repair of chondral defects yields biomechanically inferior fibrocartilage rather than durable hyaline cartilage.
  downstream:
  - target: Progression to Secondary Osteoarthritis
    description: Inferior fibrocartilage degrades under load, leaving the joint surface vulnerable to degenerative progression.
- name: Progression to Secondary Osteoarthritis
  conforms_to: "osteoarthritis_cartilage_degradation#Mechanical Overload and Chondrocyte Stress"
  description: >-
    An untreated or inadequately repaired focal chondral defect concentrates
    mechanical stress on adjacent cartilage and subchondral bone, promoting
    progressive cartilage loss that converges on the degenerative phenotype of
    secondary osteoarthritis and may ultimately require joint replacement. This
    is post-traumatic osteoarthritis: the focal lesion is the discrete injury
    that imposes the abnormal mechanical loading and chondrocyte stress program
    captured by the conserved osteoarthritis degradation module, motivating early
    restoration of the articular surface.
  cell_types:
  - preferred_term: Chondrocyte
    term:
      id: CL:0000138
      label: chondrocyte
  biological_processes:
  - preferred_term: response to mechanical stimulus
    term:
      id: GO:0009612
      label: response to mechanical stimulus
    modifier: INCREASED
  - preferred_term: cellular response to stress
    term:
      id: GO:0033554
      label: cellular response to stress
    modifier: INCREASED
  locations:
  - preferred_term: articular cartilage
    term:
      id: UBERON:0010996
      label: articular cartilage of joint
  evidence:
  - reference: PMID:40964061
    reference_title: "Cartilage Conundrum: Investigating Outcomes in Knee Cartilage Restoration Techniques."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Untreated lesions can lead to early development of arthritis and the need for joint replacement"
    explanation: Supports the causal link from an untreated focal cartilage defect to secondary osteoarthritis and eventual arthroplasty.
phenotypes:
- name: Activity-related knee pain
  description: >-
    Localized, activity-related knee pain and functional limitation are the
    cardinal symptoms of a symptomatic focal cartilage defect and are the
    primary outcomes measured in cartilage-repair trials. Because mature
    articular cartilage is itself aneural, the pain is thought to arise from
    secondary synovial inflammation and increased load on the innervated
    subchondral bone rather than from the cartilage lesion directly.
  phenotype_term:
    preferred_term: Knee pain
    term:
      id: HP:0030839
      label: Knee pain
  evidence:
  - reference: PMID:24714783
    reference_title: "Matrix-Applied Characterized Autologous Cultured Chondrocytes Versus Microfracture: Two-Year Follow-up of a Prospective Randomized Trial."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The mean KOOS pain and function subscores from baseline to 2 years were significantly more improved with MACI than with MFX"
    explanation: Pain (KOOS pain) is a co-primary clinical manifestation of symptomatic knee cartilage defects and improves with cartilage repair.
  - reference: PMID:34507359
    reference_title: "The Large Focal Isolated Chondral Lesion."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Focal chondral defects (FCDs) of the knee can be a debilitating condition that can clinically translate into pain and dysfunction in young patients with high activity demands"
    explanation: Establishes pain and dysfunction in young, active patients as the defining clinical presentation of focal chondral defects.
  - reference: PMID:38534520
    reference_title: "Knee Joint Preservation in Tactical Athletes: A Comprehensive Approach Based upon Lesion Location and Restoration of the Osteochondral Unit."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Osteochondral lesions (OCL) of the knee have long been acknowledged as significant sources of knee pain and functional deficits"
    explanation: Independent review confirming knee pain and functional deficit as the core manifestations of focal osteochondral lesions.
- name: Joint swelling
  description: >-
    Recurrent effusion/swelling of the affected knee is common, reflecting
    synovial irritation from the chondral lesion and debris.
  phenotype_term:
    preferred_term: Joint swelling
    term:
      id: HP:0001386
      label: Joint swelling
- name: Mechanical symptoms and restricted motion
  description: >-
    Catching, locking, and giving-way with limitation of knee motion occur when
    a chondral flap or loose body mechanically obstructs the joint.
  phenotype_term:
    preferred_term: Limitation of joint mobility
    term:
      id: HP:0001376
      label: Limitation of joint mobility
  evidence:
  - reference: PMID:34507359
    reference_title: "The Large Focal Isolated Chondral Lesion."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "can clinically translate into pain and dysfunction in young patients with high activity demands"
    explanation: Focal chondral defects produce mechanical dysfunction and functional limitation of the knee in young, active patients.
- name: Secondary osteoarthritis
  description: >-
    An untreated focal defect is a recognized precursor of secondary
    osteoarthritis of the knee.
  phenotype_term:
    preferred_term: Osteoarthritis
    term:
      id: HP:0002758
      label: Osteoarthritis
    clinical_course: PROGRESSIVE
  evidence:
  - reference: PMID:40964061
    reference_title: "Cartilage Conundrum: Investigating Outcomes in Knee Cartilage Restoration Techniques."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Untreated lesions can lead to early development of arthritis and the need for joint replacement"
    explanation: Documents progression of untreated cartilage lesions to osteoarthritis.
treatments:
- name: Matrix-Applied Autologous Chondrocyte Implantation (MACI)
  description: >-
    Two-stage autologous cell therapy for symptomatic full-thickness cartilage
    defects of the knee. Chondrocytes are arthroscopically harvested, expanded
    in culture, and seeded onto a porcine type I/III collagen membrane that is
    implanted into the debrided defect to regenerate hyaline-like cartilage. In
    the randomized SUMMIT trial, MACI was clinically and statistically superior
    to microfracture for symptomatic defects of the knee. MACI is indicated for
    focal cartilage defects, not for generalized osteoarthritis.
  therapeutic_modality: CELL_THERAPY
  treatment_term:
    preferred_term: cellular therapy
    term:
      id: MAXO:0000016
      label: cellular therapy
    therapeutic_agent:
    - preferred_term: autologous cultured chondrocytes
      term:
        id: NCIT:C87436
        label: Autologous Cultured Chondrocytes
  target_mechanisms:
  - target: Impaired Intrinsic Cartilage Repair
    treatment_effect: RESTORES
    description: MACI implants cultured autologous chondrocytes to regenerate hyaline-like cartilage, directly compensating for the cartilage's failed intrinsic repair.
  evidence:
  - reference: PMID:24714783
    reference_title: "Matrix-Applied Characterized Autologous Cultured Chondrocytes Versus Microfracture: Two-Year Follow-up of a Prospective Randomized Trial."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "MACI offers a more efficacious alternative than MFX with a similar safety profile for the treatment of symptomatic articular cartilage defects of the knee"
    explanation: Randomized controlled evidence that MACI is efficacious for symptomatic focal cartilage defects of the knee.
- name: Microfracture (marrow stimulation)
  description: >-
    A single-stage arthroscopic marrow-stimulation procedure in which small
    perforations are made in the subchondral bone to recruit marrow mesenchymal
    cells into the defect. It is technically simple and lower cost but produces
    biomechanically inferior fibrocartilage and is generally less durable than
    cell-based repair for larger defects.
  therapeutic_modality: SURGERY
  treatment_term:
    preferred_term: surgical procedure
    term:
      id: MAXO:0000004
      label: surgical procedure
  target_mechanisms:
  - target: Impaired Intrinsic Cartilage Repair
    treatment_effect: BYPASSES
    description: Perforating the subchondral plate recruits marrow mesenchymal cells into the defect, bypassing the avascular cartilage's failed intrinsic repair, but the resulting fill is fibrocartilage.
  evidence:
  - reference: PMID:9533054
    reference_title: "Current treatment options for the restoration of articular cartilage."
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: "produce only fibrocartilage and therefore do not offer a long-term cure"
    explanation: Marrow-stimulation techniques relieve symptoms but generate fibrocartilage rather than durable hyaline repair.
- name: Osteochondral Allograft Transplantation
  description: >-
    Transplantation of size-matched donor osteochondral plugs (mature hyaline
    cartilage on a supporting bone base) into the debrided defect. It is a
    restorative option reserved for larger or deeper lesions and osteochondral
    defects involving the subchondral bone, where surface-based or marrow-
    stimulation techniques are less durable.
  therapeutic_modality: SURGERY
  treatment_term:
    preferred_term: surgical procedure
    term:
      id: MAXO:0000004
      label: surgical procedure
  target_mechanisms:
  - target: Full-Thickness Chondral Injury
    treatment_effect: RESTORES
    description: A mature osteochondral graft physically replaces the defect, restoring the articular surface and, for osteochondral lesions, the underlying subchondral bone.
  - target: Impaired Intrinsic Cartilage Repair
    treatment_effect: BYPASSES
    description: Transplanting pre-formed mature hyaline cartilage bypasses the need for intrinsic repair the host cartilage cannot achieve.
  evidence:
  - reference: PMID:34507359
    reference_title: "The Large Focal Isolated Chondral Lesion."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "chondral lesions that involve a larger area or depth require restorative procedures such as osteochondral allograft transplantation or other cell-based techniques"
    explanation: Supports osteochondral allograft transplantation as the restorative approach for larger or deeper focal chondral lesions.
- name: Osteochondral Autograft Transfer (OAT / mosaicplasty)
  description: >-
    Transfer of one or more autologous osteochondral plugs harvested from a
    low-weightbearing region of the knee into the defect, restoring the surface
    with the patient's own mature hyaline cartilage. It is generally used for
    smaller focal osteochondral lesions. A 10-year randomized trial in athletes
    found OAT gave higher rates of return to and maintenance of preinjury-level
    sport than microfracture.
  therapeutic_modality: SURGERY
  treatment_term:
    preferred_term: surgical procedure
    term:
      id: MAXO:0000004
      label: surgical procedure
  target_mechanisms:
  - target: Full-Thickness Chondral Injury
    treatment_effect: RESTORES
    description: Autologous osteochondral plugs physically restore the cartilage (and subchondral) surface at the defect.
  - target: Impaired Intrinsic Cartilage Repair
    treatment_effect: BYPASSES
    description: Grafting mature autologous hyaline cartilage bypasses the cartilage's failed intrinsic repair.
  evidence:
  - reference: PMID:23024150
    reference_title: "Ten-year follow-up of a prospective, randomized clinical study of mosaic osteochondral autologous transplantation versus microfracture for the treatment of osteochondral defects in the knee joint of athletes."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The OAT technique for ACD or OCD repair in the athletic population allows for a higher rate of return to and maintenance of sports at the preinjury level compared with MF"
    explanation: A 10-year randomized controlled trial supports osteochondral autograft transfer as superior to microfracture for return to sport after focal osteochondral defects.
references:
- reference: PMID:24714783
  title: "Matrix-Applied Characterized Autologous Cultured Chondrocytes Versus Microfracture: Two-Year Follow-up of a Prospective Randomized Trial."
- reference: PMID:28244303
  title: "Autologous chondrocyte implantation in the knee: systematic review and economic evaluation."
- reference: PMID:40964061
  title: "Cartilage Conundrum: Investigating Outcomes in Knee Cartilage Restoration Techniques."
- reference: PMID:9533054
  title: "Current treatment options for the restoration of articular cartilage."
- reference: PMID:34507359
  title: "The Large Focal Isolated Chondral Lesion."
- reference: PMID:38534520
  title: "Knee Joint Preservation in Tactical Athletes: A Comprehensive Approach Based upon Lesion Location and Restoration of the Osteochondral Unit."
- reference: PMID:23024150
  title: "Ten-year follow-up of a prospective, randomized clinical study of mosaic osteochondral autologous transplantation versus microfracture for the treatment of osteochondral defects in the knee joint of athletes."

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References & Deep Research

References

7

PMID:24714783

Matrix-Applied Characterized Autologous Cultured Chondrocytes Versus Microfracture: Two-Year Follow-up of a Prospective Randomized Trial.