Injury to the ulnar collateral ligament (at the base of the thumb closer to the index finger) can result from a force, which stretches the thumb away from the index finger.

Sports Injuries: Skier's Thumb

The Injury

Injury to the ulnar collateral ligament (at the base of the thumb closer to the index finger) can result from a force, which stretches the thumb away from the index finger. It often occurs with a ski pole forcing the thumb deviation. Pain is located at the base of the thumb and X-rays will rule out an associated fracture. A physician should evaluate the injury. Treatment depends on the severity of the ligament disruption. Immobilization will help control pain and allow healing of incomplete tears. Complete disruption of the ligament may require surgery.