Final answer:
A closed bone or joint injury is an injury that occurs in a bone or joint without any break in the skin or open wound.
Step-by-step explanation:
A closed bone or joint injury is best defined as an injury that occurs in a bone or joint. It is not necessarily an injury that occurs in a closed environment, is due to a fracture, or is due to a dislocation. A closed injury means that the skin is intact and there is no open wound or break in the skin.