<prompt> Crutch palsy is injury to which nerve?Radial nerveUlnar nerveMedian nerveMusculocutaneous nerve  <response>: 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. 