Ski thumb

A skier’s thumb is a common injury among skiers, which is where the name comes from. It is also known as gamekeeper’s thumb. This injury often occurs after a fall in which someone tries to break the fall with their hands. Another common cause is when a ball hits the thumb directly (hence the name gamekeeper’s thumb).

Keep in mind that a skier’s thumb can also occur during other (sports) activities. During many types of sports or accidental falls, the ulnar collateral ligament (UCL) of the thumb joint can be damaged. In a skier’s thumb, this ligament becomes stretched, loosened, or torn. This ligament is located on the inner side of the thumb. When it is affected, the thumb joint can become unstable.