What is the primary characteristic of osteoarthritis (OA)?

The primary characteristic of osteoarthritis (OA) is that it is a progressive, degenerative joint disease. This means that OA is marked by the gradual deterioration of joint cartilage and the underlying bone, often leading to pain, stiffness, and decreased mobility in the affected joints. As the condition progresses, the wear and tear on the joints can result in further damage, which may include bone spurs and changes in joint structure. This process typically occurs over time and is often associated with age, repetitive stress on the joints, or previous injuries. By understanding OA as a degenerative disorder, one can appreciate the implications for treatment and management, which often focus on pain relief and maintaining joint function.