In osteoarthritis, which tissue is primarily affected?

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Multiple Choice

In osteoarthritis, which tissue is primarily affected?

Explanation:
Articular cartilage is the tissue primarily affected in osteoarthritis. The disease starts with breakdown of the cartilage matrix—loss of proteoglycans and type II collagen—due to mechanical wear and limited repair by chondrocytes in this avascular tissue. As cartilage thins and fibrillates, the joint loses its smooth, shock‑absorbing surface, leading to exposure and remodeling of the subchondral bone, sclerosis, cysts, and osteophyte formation. Synovial inflammation can occur, but it usually arises secondary to cartilage debris and ongoing joint damage rather than being the initial target of OA.

Articular cartilage is the tissue primarily affected in osteoarthritis. The disease starts with breakdown of the cartilage matrix—loss of proteoglycans and type II collagen—due to mechanical wear and limited repair by chondrocytes in this avascular tissue. As cartilage thins and fibrillates, the joint loses its smooth, shock‑absorbing surface, leading to exposure and remodeling of the subchondral bone, sclerosis, cysts, and osteophyte formation. Synovial inflammation can occur, but it usually arises secondary to cartilage debris and ongoing joint damage rather than being the initial target of OA.

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