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Femoral condyle articular cartilage

The femoral condyle articular cartilage is a smooth layer of hyaline cartilage covering the medial and lateral femoral condyles where they articulate with the tibia and patella. It is an essential component of the knee joint, allowing low-friction articulation and efficient load distribution. The cartilage has no direct blood supply; instead, it relies on diffusion from synovial fluid for nutrition. Its integrity is critical for normal knee biomechanics, and damage leads to pain, osteoarthritis, or chondral defects.

Synonyms

  • Knee joint articular cartilage (femoral condyle)

  • Hyaline cartilage of femoral condyles

  • Femoral condylar cartilage

Structure and Attachments

  • Composed of hyaline cartilage organized into four zones:

    • Superficial (tangential) zone: Thin collagen fibers aligned parallel to the surface, resists shear forces

    • Middle (transitional) zone: Randomly oriented fibers, provides compressive strength

    • Deep (radial) zone: Fibers oriented perpendicular to subchondral bone, resists compression

    • Calcified cartilage zone: Anchors cartilage to subchondral bone

  • Thickness: Varies by region; thicker in the load-bearing central condyle, thinner near margins

  • No vascular, lymphatic, or neural supply

Relations

  • Superiorly: Continuous with periosteum of the femoral shaft near metaphysis

  • Inferiorly: In contact with tibial articular cartilage at tibiofemoral joint

  • Anteriorly: Forms part of patellofemoral articulation with patellar cartilage

  • Posteriorly: Related to posterior condylar surfaces and menisci attachments

Function

  • Provides a smooth, low-friction surface for femoral condyles

  • Distributes joint loads evenly across tibiofemoral and patellofemoral joints

  • Absorbs and resists compressive and shear forces during movement

  • Protects underlying subchondral bone

Clinical Significance

  • Susceptible to chondral injuries, osteochondral defects, and osteoarthritis

  • Common site of sports injuries (e.g., femoral condyle cartilage tears)

  • Cartilage loss leads to progressive joint degeneration and pain

  • Target for regenerative therapies (e.g., microfracture, autologous chondrocyte implantation)

MRI Appearance

T1-weighted images:

  • Normal cartilage: intermediate-to-low signal intensity

  • Lesions (fissures, defects): appear as focal low signal areas

T2-weighted images:

  • Normal cartilage: intermediate-to-high signal intensity, clearly delineated from low-signal subchondral bone

  • Cartilage degeneration or edema: heterogeneous bright signal

STIR (Short Tau Inversion Recovery):

  • Cartilage itself shows intermediate-to-high signal intensity

  • Pathology (inflammation, defect): appears as bright hyperintense areas

Proton Density Fat-Saturated (PD FS):

  • Excellent for cartilage evaluation

  • Normal cartilage: intermediate-to-high homogeneous signal

  • Cartilage defects, fissures, and edema: bright hyperintense

T1 Fat-Sat Post-Contrast:

  • Normal cartilage: minimal or no enhancement

  • Defects, repair tissue, or degeneration: variable enhancement at surface or subchondral interface

CT Appearance

Non-Contrast CT:

  • Cartilage is not well visualized; appears as a thin hypoattenuating layer over femoral condyles

  • Loss of cartilage is inferred by joint space narrowing or subchondral changes

Post-Contrast CT (CT Arthrography):

  • Contrast outlines cartilage thickness and defects

  • Fissures, thinning, or full-thickness defects appear as contrast filling defects or clefts

  • Superior to conventional CT for cartilage imaging

MRI image

Femoral condyle articular cartilage axial cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

MRI image

Femoral condyle articular cartilage sagittal cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

CT image

Femoral condyle articular cartilage ct image