Author: Ryan Circh, MD Educational Pearls: Ulnar collateral ligament injury is often called gamekeeper’s thumb or skier’s thumb Can results from traumatic deviating the thumb radially (abduction) Poor rabbits Have a low threshold for referral to hand surgery for follow up - treatment for minor injuries can be conservative but more severe require surgery to preserve function This injury should be placed in a thumb spica splint Radiographs are often negative unless an avulsion fracture is present Editor’s note: to test for UCL injuries, I like this. References: Schroeder NS, Goldfarb CA. Thumb ulnar collateral and radial collateral ligament injuries. Clin Sports Med. 2015 Jan;34(1):117-26. doi: 10.1016/j.csm.2014.09.004. Epub 2014 Oct 11. Review. PubMed PMID: 25455399. Madan SS, Pai DR, Kaur A, Dixit R. Injury to ulnar collateral ligament of thumb. Orthop Surg. 2014 Feb;6(1):1-7. doi: 10.1111/os.12084. Review. PubMed PMID: 24590986. Summarized by Travis Barlock, MS4 | Edited by Erik Verzemnieks, MD