The Pathophysiology of osteoarthritis is the affection of articular cartilage, along with the synovial fluid in the joint, permitting almost frictionless movement of joint bones at their points of contact. The frictional resistance of normal joints is the cartilage layer to absorb the shock associated with joint use. When weight is loaded onto the joint, the cartilage layer compresses. Once the weight is removed, the cartilage rebounds to its original dimensions. The articular cartilage is firmly attached to its underlying subchondral bone by a subchondral plate. This allows the subchondral plate to act as a shock absorber, which protects the joint from applied
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