strain fracture

a·vul·sion frac·ture

a fracture that occurs when a joint capsule, ligament, or muscle insertion or origin is pulled from the bone as a result of a sprain, dislocation, or strong contracture of the muscle against resistance; as the soft tissue is pulled away from the bone, a fragment (or fragments) remains attached to the soft tissue of the bone. Synonym(s): strain fracture

avulsion fracture

A fracture which occurs when a fragment of bone is forced out of the surrounding bone by tightened ligaments due to a strain or intense muscle contraction against resistance.

strain frac·ture

(strān frak'shŭr) The tearing off, by a sudden force, of a piece of bone attached to a tendon, ligament, or capsule.