what is a gamekeeper
Gamekeeper's Thumb. Gamekeeperâs thumb is a repetitive stress injury of the ulnar collateral ligamentâtough fibrous tissue that connects the bones at the base of the thumb. Over time, overuse leads to the loosening of the ulnar ligament.Gamekeeperâs thumb most often occurs as a result of chronic overuse in a sport such as skiing in which gripping of the pole exerts repeated stress on the thumb.ver time, overuse leads to the loosening of the ulnar ligament. Gamekeeperâs thumb most often occurs as a result of chronic overuse in a sport such as skiing in which gripping of the pole exerts repeated stress on the thumb.