Final answer:
A sprain is the injury that results when a joint is overstretched, causing ligament damage without bone deformity.
Step-by-step explanation:
The type of injury that occurs when a joint is twisted or stretched beyond its normal range of motion, resulting in swelling but no deformity, is known as a sprain. A ligament is a short band of tough connective tissue that connects bones together to form a joint. When a ligament is injured, the protein fibers can become strained or torn, which causes pain and swelling. Common examples include ankle sprains or high ankle sprains, which affect the ligaments connecting the tibia and fibula. In contrast, a strain refers to injuries to muscles or tendons, fractures refer to broken bones, and dislocations occur when the ends of bones are forced out of their normal positions in a joint.