AbstractA young woman presented with an acute ulnar collateral ligament injury of the thumb, owing to a pathological fracture through an enchondroma. Treatment included bone graft and fracture fixation, with successful healing and functional recovery. Level of evidence: VKeywordsEnchondromaskier’s thumbulnar collateral ligamentcase reportGet full access to this articleView all access options for this article.Get accessReferences1. Gaulke R. The distribution of solitary enchondromata at the hand. J Hand Surg Br. 2002, 27: 444–5.2. Kapandji A. [Clinical test of apposition and counter-apposition of the thumb]. Ann Chir Main. 1986, 5: 67–73.3. Tang C Chan M Fok M Fung B. Current management of hand enchondroma: A review. Hand Surg. 2015, 20: 191–5.