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Part 9 > Chapter 132　Ulnar Collateral Ligament Tear of the Thumb(Ski Pole, Skier’s, or Gamekeeper’s Thumb)

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著者：Katherine Dolbec and Joe Ravera
 
Abstract
Ulnar collateral ligament sprain, generally occurring after an abduction force has been placed on an extended thumb, is a painful and potentially debilitating injury that requires recognition. Patients present with pain at the base of the affected thumb. When a complete rupture is present, there may be significant instability, and surgery may be required to prevent long-term instability and poor function.
 
Keywords
first metacarpophalangeal (MCP) joint
gamekeeper's thumb
ski pole thumb
skier's thumb
Stener lesion
thumb injury
thumb sprain
ulnar collateral ligament
Ulnar collateral ligament tear of the thumb

Presentation  
    The patient fell while holding on to a ski pole, banister, or other fixed object, forcing the thumb radially into abduction and causing pain at the base of the thumb. The metacarpophalangeal (MCP) joint of the thumb is swollen and tender and may be ecchymotic. When tested for stability, it may show varying degrees of joint widening toward the radial (or palmar) aspect more than the MCP joint of the other thumb. The patient’s power pinch between the thumb and index finger, if possible at all, is less strong than with the other hand (Fig. 132.1).
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