In Addition to Direct Contusions on the Ulnar Nerve at the Posteromedial

In addition to direct contusions on the ulnar nerve at the posteromedial elbow leading to symptoms, the ulnar nerve may develop symptoms from which of the following?

A) Chronic contusions or pressure over ulnar nerve area
B) The ulnar nerve Subluxing or slipping out of its grooves
C) Traction injury to this nerve with the medial stress placed on the elbow during pitching or in conjunction with an ulnar collateral ligament sprain
D) All of the above