<prompt> Tardy ulnar nerve palsy is due to ___:Cubitus valgusFixation of the nerve in the groove by osteoarthritisExcision of elbow jointFracture of internal condyle  <response>: Ans. A. Cubitus valgusTardy ulnar nerve palsy is due to cubitus valgus.Fracture of the lateral condyle of humerus in the long run can lead to complications such as cubitus valgus.Friction neuritis of the ulnar nerve as it moves over the medial epicondyle every time the elbow is flexed and extended may result in a late ulnar nerve palsy called as tardy ulnar nerve palsy. 