Abstract
Repetitive trauma to the hypothenar region may cause hypothenar hammer syndrome (HHS) characterized by inadequate circulation to the ulnar digits. We experienced a rare case of HHS caused by single trauma. A 13-year-old boy complained of numbness and cyanosis to three ulnar 3 digits after hitting the left hypothenar region on the floor when trying to receive a ball during volleyball game. Thermograms revealed low temperature of the three ulnar digits and angiograms showed occlusion of the ulnar artery whose superficial branch had little connection with the radial artery. We found a pseudo-aneurysm of the ulnar artery at the Guyon canal during surgery and an interpositional vein graft was performed after resection. After surgery his symptoms and signs disappeared and he could play volleyball again.
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