This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
In extension type of supracondylar fracture, the usual displacement 
Select and explain. 
A. Anterolateral, B. Anterolateral, C. Posteromedial, D. Posterolateral
D: Posterolateral
Answer: D: Posterolateral 
Explanation: Ans. is 'd' i.e., Posterolateral Types of supracondylar fracture Supracondylar fracture is broadly classified into extension type and flexion type. 1. Extension type It is the most common type (97 - 99%). Distal fragment is extended (tilted backward/posteriorly) in relation to proximal fragment. Occurs due to hyperextension injury after fall on outstretched hands. Generally, displacement of distal fragment may be : ? Posteromedial (70-80%) Posterolateral (20-30%) 2. Flexion type It is less common type (1-3 %) Distal fragment is flexed (tilted forward/anteriorly) in relation to proximal fragments. The mechanism of injury generally is believed to be a fall directly onto the elbow rather than a fall on outstretched hand. As the extension type fracture is more common (97 - 99%), the most common elbow injury in children is extension type of supracondylar fracture.