Gamekeeper's thumb (also known as skier's thumb or UCL tear) is a type of injury to the ulnar collateral ligament common among gamekeepers, especially Scottish fowl-hunters. The hunter woul carry home their game with a leather throng attached to their thumb draped over their shoulder. Other sources cite the fact that English gamekeepers sustained the injury because they killed rabbits with a forceful blow from their thumb to the back of the animals' necks.