Knee in : Collateral ligament sprain · 525

The knee is the body's largest joint and one of its most frequently injured, relying on ligaments and surrounding muscles rather than bony shape for stability. Modified hinge (tibiofemoral + patellofemoral) Overuse, ligament sprain, meniscus injury, osteoarthritis 6–12 weeks for most soft-tissue injuries

Locked knee or inability to bear weight The knee is the largest and one of the most heavily loaded joints in the body, connecting the thigh bone to the shin bone while the kneecap glides in a groove at the front to assist with leg extension. Unlike the hip, the knee's bony surfaces are relatively flat, so stability depends heavily on a set of internal and surrounding ligaments.

Because the knee bears substantial load during walking, running, jumping, and pivoting, it is among the most frequently injured joints in sport and one of the most common sites of age-related osteoarthritis. Conditions range from overuse-related tendon and cartilage irritation to acute ligament and meniscus injuries.