What joint is involved in Gamekeeper's thumb?

Gamekeeper's thumb, also known as skier's thumb, is primarily associated with the carpometacarpal (CMC) joint of the thumb. This condition typically arises from a strain or tear of the ulnar collateral ligament (UCL) at the CMC joint, which is crucial for the stability and function of the thumb during gripping and pinch activities.

The mechanics of the injury often involve an acute injury from a fall or a sudden force applied to the thumb, which can overstretch or rupture the ligament. Understanding the specific anatomical location of this injury is vital for proper diagnosis and treatment, as it can lead to significant impairment if not addressed.

The other joints listed—the elbow joint, hip joint, and knee joint—are not directly related to this specific thumb injury, solidifying the CMC joint as the correct answer for Gamekeeper’s thumb. Recognizing the specific joint involved aids in targeted rehabilitation and orthotic fitting in practice.