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
Crutch palsy is injury to which nerve? 
Select and explain. 
A. Radial nerve, B. Ulnar nerve, C. Median nerve, D. Musculocutaneous nerve
A: Radial nerve
Answer: A: Radial nerve 
Explanation: Answer-A. Radial nerveVery high lesions of radial nerve may be caused by trauma or operations around the shoulder.This is seen in drink and drug addicts who fall into a stupor with the arm dangling over the back of a chair ('saturday night pals/) or in thin elderly patients using crutches ('crutch palsy').