<prompt> Supracondylar fracture is usually caused byHyperflexion injuryAxial rotationExtension injuryHyperextension injury  <response>: supracondylar fracture of the humerus is the most serious fracture in childhood. Mechanism: The fracture is caused by a fall on an outstretched hand.As hand strikes the ground the elbow is forced into hyperextension resulting in fracture of humerus above the condyles. Ref: Essential Ohopaedics, Maheswari Mhaskar, Edition 5, Page no: 97 