This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around Arm & Elbow, Subject name: Orthopaedics
Malunion of the supracondylar fracture of the humerus in children results 
Select and explain. 
A. Flexion deformity, B. Extension deformity, C. Cubitus varus deformity, D. Cubitus valgus deformity
C: Cubitus varus deformity
Answer: C: Cubitus varus deformity 
Explanation: (Cubitus varus deformity) (599-Apley's 8th)* Malunion is the commonest complication of a supra condylar fracture and results in a cubitus varus deformity (Gun-stock deformity)* This is because the fracture unites with the distal fragment tilted medially and in internal rotation* Cubitus valgus deformity results from fracture lateral condyle of humerus. This may result in late ulnar nerve palsy (Tardy-ulnar nerve palsy)