Final answer:
A sprain is a musculoskeletal injury that involves partial separation of the bone ends and stretching or tearing of ligaments. Ligament sprains are caused by the overstretching or tearing of ligaments that connect bones together.
Step-by-step explanation:
A sprain is a musculoskeletal injury in which there is partial or temporary separation of the bone ends as well as partial stretching or tearing of the supporting ligaments. Ligament sprains are caused by the overstretching or tearing of ligaments, which are short bands of tough connective tissue that connect bones together to form a joint. An example of a common sprain is an ankle sprain.