Treatment of Ulnar Collateral Ligament Fracture-Avulsion of the Thumb: A Case Report

Abstract

Ulnar collateral ligament (UCL) injuries of the thumb, often termed "gamekeeper's thumb," can result from falls or repetitive thumb abduction, predominantly affecting males. The severity ranges from stretching (grade I) to complete tearing (grade III), occasionally accompanied by avulsion fractures. Surgical intervention is advocated in some cases to restore joint stability and prevent osteoarthritis. The authors present a case report of a 51-year-old male with a displaced avulsion fracture at the UCL's distal attachment. Surgical treatment was performed. A lazy S dorsomedial approach over the first metacarpophalangeal joint was made, with careful protection of the dorsal cutaneous branches of the radial sensory nerve. An anatomic reduction of the fracture was achieved with the use of a suture passing k wire that was inserted through the avulsed fragment and then the phalanx and a non-absorbable suture (fiberwire) was passed. The free ends of the suture were securely tied on the distal radial side of the proximal phallanx, ensuring a stable fixation. Postoperative immobilization and rehabilitation led to a successful outcome, with the patient returning to work within 6 weeks, without complications. This case underscores the importance of surgical techniques in managing UCL injuries, emphasizing the restoration of joint stability to prevent long-term complications such as osteoarthritis, chronic pain and stiffness. The described method offers a viable option for treating UCL avulsion fractures, facilitating early recovery and preserving joint function.