Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.
chronic radial subluxation of the metacarpophalangeal joint of the thumb.
gamekeeper's thumbAn avulsion fracture at the ulnar base of the proximal phalanx of the thumb, linked to the ulnar collateral ligament of the metacarpophalangeal joint; GT occurs in 'week-end warriors', ie football or skiing injuries–as in a twisted ski pole, often due to falls Features Valgus instability, treated by a cast in adduction; if point instability is marked, open repair of ligament
game·keep·er's thumb(gām'kēp-ĕrz thŭmb)
Rupture of the volar ligament at the first metacarpophalangeal joint due to forceful abduction of the thumb while extended.