0:28
In this brief educational video, the speaker defines osteoarthritis (OA) as a degenerative joint disease caused by the loss of articular cartilage, which normally protects bone surfaces. Without this cartilage, bone‑on‑bone contact occurs, leading to pain. The speaker outlines the hallmark clinical features of OA: joint pain, stiffness, and reduced range of motion. Stiffness is typically most noticeable in the morning, improves with gentle movement, but pain tends to worsen later in the day with joint use. The explanation emphasizes the relationship between cartilage wear, mechanical friction, and the characteristic symptom pattern.
