Methods: Retrospective analysis of 21 supracondylar fractures of femur treated by retrograde intramedullary nailing, of which 18 cases were A1 supracondylar fracture and 3 cases A2.

• 方法：应用股骨髁上逆向交锁髓内钉治疗21例股骨髁上骨折患者，其中A1型18例，A2型3例。