Causes

A sprain occurs when you overextend or tear a ligament while severely stressing a joint. Sprains often occur in the following circumstances:

• Ankle — Walking or exercising on an uneven surface, landing awkwardly from a jump
• Knee — Pivoting during an athletic activity
• Wrist — Landing on an outstretched hand during a fall
• Thumb — Skiing injury or overextension when playing racquet sports, such as tennis

Children have areas of softer tissue, called growth plates, near the ends of their bones. The ligaments around a joint are often stronger than these growth plates, so children are more likely to experience a fracture than a sprain.