disease process for osteoarthritis
Osteoarthritis (OA). Osteoarthritis (OA) is a chronic disease process affecting synovial joints, particularly large weight-bearing joints. OA is particularly common in older patients but can occur in younger patients either through a genetic mechanism or, more commonly, because of previous joint trauma.steoarthritis (OA) is a chronic disease process affecting synovial joints, particularly large weight-bearing joints.