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Tibial condyle articular cartilage

The tibial condyle articular cartilage forms the smooth, hyaline cartilage covering the superior surfaces of the medial and lateral tibial condyles, also known as the tibial plateau. It articulates with the femoral condyles, forming part of the tibiofemoral joint. The cartilage provides a low-friction, load-distributing surface essential for knee stability and mobility.

The thickness of tibial cartilage varies across the plateau, being generally thinner than femoral cartilage, with maximal thickness in the lateral tibial condyle. Degeneration, injury, or loss of this cartilage is central to the development of osteoarthritis and other knee pathologies.

Synonyms

  • Tibial plateau cartilage

  • Knee joint tibial articular cartilage

  • Articular cartilage of tibial condyles

Structure and Location

  • Composition: Hyaline cartilage consisting of chondrocytes within an extracellular matrix rich in type II collagen and proteoglycans

  • Zones: Superficial (tangential), transitional, radial (deep), and calcified cartilage zone

  • Location: Covers the superior aspect of both medial and lateral tibial condyles forming the tibial plateau

  • Relations:

    • Superiorly: Femoral condyles (weight-bearing articulation)

    • Inferiorly: Subchondral bone of tibial condyles

    • Medially and laterally: Menisci interposed between femoral and tibial cartilage surfaces

Function

  • Provides a smooth, lubricated surface for articulation with femoral condyles

  • Distributes load during weight-bearing, walking, and running

  • Absorbs shock and reduces stress on subchondral bone

  • Maintains stability of the tibiofemoral joint in association with menisci and ligaments

Clinical Significance

  • Osteoarthritis: Progressive thinning and loss of tibial cartilage is a hallmark feature

  • Trauma: Cartilage defects from fractures or sports injuries

  • Meniscal pathology: Alters loading and contributes to cartilage wear

  • Inflammatory disease: Rheumatoid arthritis may involve tibial cartilage erosion

  • Surgical planning: MRI evaluation critical for meniscal repair, cartilage restoration, or knee replacement

MRI Appearance

T1-weighted images:

  • Normal tibial cartilage shows intermediate-to-low signal intensity

  • Provides contrast with high-signal subchondral fat and marrow

T2-weighted images:

  • Cartilage shows intermediate-to-high signal intensity

  • Fluid-sensitive; defects or fissures appear as bright signal extending to subchondral bone

STIR (Short Tau Inversion Recovery):

  • Normal cartilage: intermediate signal

  • Edema in adjacent bone or cartilage lesions appears bright hyperintense

Proton Density Fat-Saturated (PD FS):

  • Normal cartilage: intermediate-to-high signal intensity

  • Cartilage defects, fissures, and early chondral lesions appear bright against suppressed fat background

T1 Fat-Sat Post-Contrast:

  • Normal cartilage enhances minimally

  • Pathologic cartilage (degeneration, inflammation) shows heterogeneous enhancement

  • Defects and fissures may enhance peripherally due to synovial fluid or vascular invasion in repair response

CT Appearance

Non-Contrast CT:

  • Cartilage itself is poorly visualized (low density, similar to joint fluid)

  • Indirect assessment via joint space width and subchondral bone changes

  • Calcified cartilage, if present, appears denser

Post-Contrast CT (CT Arthrography):

  • Intra-articular contrast outlines tibial cartilage as a smooth surface

  • Cartilage defects appear as contrast-filled clefts or surface irregularities

  • Useful for evaluating focal chondral injuries or postoperative cartilage repair

MRI image

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

MRI image

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