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
Open reduction is not required in which fracture : 
Select and explain. 
A. Patella, B. Outer 1/3 of radius head, C. Condyle of humerus, D. Olecranon displaced #
B: Outer 1/3 of radius head
Answer: B: Outer 1/3 of radius head 
Explanation: Involvement of > 1/3rd of the head is an indication for excision of the fragment (not open reduction).