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: Orthopaedics
Excision of the head of the radius in a child should not be done because : 
Select and explain. 
A. It produces instability of elbow joint, B. It leads to secondary osteoarthritis of elbow, C. It causes subluxation of inferior radio-ulnar joint, D. It causes myositis ossificans
C: It causes subluxation of inferior radio-ulnar joint
Answer: C: It causes subluxation of inferior radio-ulnar joint 
Explanation: Complications of radial head excision in children :

Proximal migration of radius with inferior radio - ulnar (distal radio - ulnar) joint instability.
Postero-lateral instability.
Cubitus valgus deformity.