A 58-year-old woman is diagnosed with osteoarthritis (OA) in her hips. Which of the following most closely describes the pathophysiology of OA?

Choice A reason: Osteoarthritis is not caused by bacterial infection. While septic arthritis involves infection, OA is a degenerative joint disease resulting from mechanical wear and tear, not infectious etiology. Choice B reason: OA is not an autoimmune disorder and is not linked to Epstein-Barr virus. Autoimmune joint diseases such as rheumatoid arthritis involve immune-mediated synovial inflammation, which is not characteristic of OA. Choice C reason: This description applies to rheumatoid arthritis, not OA. In RA, synovial inflammation leads to joint destruction and deformity due to autoimmune mechanisms. OA involves cartilage degeneration without significant synovial inflammation. Choice D reason: OA is a chronic, progressive condition characterized by the breakdown of articular cartilage, subchondral bone remodeling, and joint space narrowing. It leads to pain, stiffness, and reduced mobility, especially in weight-bearing joints like the hips.