Game Keeper's thumb is :
Injury to the ulnar collateral ligament of the thumb metacarpophalangeal joint is commonly referred to as gamekeeper's thumb or skier's thumb.
Injury occurs by fall on hand with forceful radial and palmar adduction of thumb as seen in skiers.
It is the most common injury of MCP joint.
Ulnar collateral ligament injury of MCP Joint
Radial collateral ligament injury of MCP joint
Radial collateral ligament injury of CMC joint
Ulnar collateral ligament injury of CMC joint