Gamekeeper’s thumb refers to the medical condition resulting from an injury to the ulnar collateral ligament of the thumb. The ligament may be torn, damaged or torn away from its insertion site in the proximal phalanx of the thumb. This type of injury is common among volleyball players or skiers. A common cause is attempting to break a fall with an outstretched hand.Common symptoms are pain, instability of the thumb and difficulty sustaining a strong pinch grasp. A thumb spica brace such as the ones below, chosen after consultation with your doctor, will provide the stabilization necessary to allow the injury to heal.