Capitellar fracture is a rare type of fracture in the distal humerus.More rarely, type IV capitellar fracture is combined with lateral epicondylar fracture and valgus instability of the elbow joint.

• 摘要肱骨小头骨折是一种肱骨末端之罕见骨折，第四型肱骨小头骨折同时并有肱骨外侧上髁骨折及肘关节外翻性不稳，更是少见。