This document discusses common injuries involved in active recreational activities such as sprains, strains, knee injuries, fractures, and dislocations. Sprains are tears of ligaments from falls or blows to joints. Strains are tears of muscles or tendons from overstretching or overcontraction. Knee injuries can result from blows, twists, improper landings, or overexertion. Fractures are bone breaks from acute injuries or repeated stress over time. Dislocations involve the separation of bone joints, often from contact sports or falls.