Orecranon stress fracture is comparatively rare, and it is reported as a growth period baseball elbow failure. We experienced a three year natural progress of olecranon stress fracure in a 14-year-old boy.
Thought it was difficult to differentiate whether this case was stress fracture or epiphyseal closing disorder caused by traction action of the triceps brachii musle during pitching, we diagnosed it as olecranon stress fracture due to difference in the position of the epiphyseal line of the olecranon.
