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(a) Front and sectional side views of relatively healthy adult human femoral condyle (knee joint), showing articular cartilage as the white tissue covering the end of this long bone (vertical dimension ≈ 8 cm). (b) Osteoarthrtitic adult human humeral head (shoulder joint) cartilage looks more yellowish. In this image, cartilage has worn down to the bone at two locations. The radius of the humeral head articular surface is approximately 2.5 cm.
