Why OA is not just wear and tear — it's systemic inflammatory disease
Fsteoarthritis was classically taught as "joint wear from use" — simple mechanical model. Modern evidence has completely reconceptualized: it's an inflammatory disease of the entire joint involving cartilage, subchondral bone, synovium, ligaments, and periarticular muscle. There's measurable chronic low-grade inflammation (cytokines, MMPs, complement), subchondral bone remodeling, synovitis, and periarticular muscle atrophy.
This reading changes intervention. Osteoarthritis has causal link with central obesity — not only by mechanical load but by systemic inflammaging and altered adipokines. Has link with sarcopenia — periarticular muscle atrophy accelerates damage. And has link with cardiometabolic cluster — OA patients have higher incidence of HTN, T2D, CV events. That's the longevity view: it's not just joint, it's systemic cluster.
OA is not just wear — it's systemic inflammatory disease with links to cardiometabolic cluster and sarcopenia. That view changes management.