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Sagittal section of the knee joint showing the tissues on which the proposed classification of osteoarthritis is based: articular cartilage (AC), subchondral bone (SB), meniscus (M), synovium (S) and (inset) ligament (L). C, capsule; CB, cancellous bone; F, femur; H, Hoffa's fat pad; P, patella; PL, patellar ligament; QT, quadriceps tendon; T, tibia. Anatomical specimen kindly provided by Dr Stefan Milz.
