Hypothenar hammer syndrome: case reports and brief review.

Patients with hand and finger pain regularly present to primary care practices. Although a well-known clinical entity to specialists, hypothenar hammer syndrome is an uncommon vascular overuse syndrome that may not be familiar to primary care practices. It is caused by trauma to the palmar portion of the ulnar artery, usually as a result of occupational or sports activities which involve repetitively striking objects with the heel of the hand.