Final answer:
A sprain is an injury to the ligaments, articular capsule, synovial membrane, and tendons crossing the joint. Ligaments can get strained or torn when a joint gets twisted or bends too far, causing swelling and pain. Ankle sprains are a common type of sprain.
Step-by-step explanation:
A sprain is an injury to the ligaments, articular capsule, synovial membrane, and tendons crossing the joint. Ligaments are short bands of tough connective tissue that connect bones together to form a joint. When a joint gets twisted or bends too far, the ligaments can get strained or torn, causing swelling and pain. Ankle sprains are a common type of sprain.