What ligament is damaged in "gamekeeper's thumb"?

• A. Radial collateral ligament
• B. Ulnar collateral ligament
• C. Extensor tendon
• D. Flexor tendon

Answer: (B)

The correct answer is the ulnar collateral ligament. Gamekeeper's thumb is a term used to describe an injury where the ulnar collateral ligament of the thumb is damaged, often due to a forceful abduction or hyperextension of the thumb. This type of injury is common in sports like skiing, where the thumb may be forced outward.

The ulnar collateral ligament provides stability to the metacarpophalangeal joint of the thumb, and its injury can lead to significant instability, affecting grip strength and pinch strength. This is particularly critical for activities requiring a strong grasp or pinching motion.

In contrast, the radial collateral ligament is associated with the lateral stability of the thumb and does not play a primary role in gamekeeper's thumb. Likewise, while extensor and flexor tendons are crucial for thumb movement and function, they are not directly involved in the injury associated with gamekeeper's thumb, which specifically pertains to ligament damage.