Game Keeper's thumb is injury to ?

GAMEKEEPER&;S THUMB/SKIER&;S THUMB The ulnar collateral ligament inses paly inyo the palmar plate. In PAIAL RUPTURE,only the ligament proper is torn and the thumb is unstable in flexion.Here the palmar plate is intact. In COMPLETE RUPTURE,both the ligament proper and the palmar plate are torn and the thumb is unstable in all positions. C/F:Tenderness and swelling precisely over the ulnar side of the thumb metacarpophalangeal joint. X-ray is essential,to exclude a fracture berfore carrying out any stress tests. TREATMENT: Paial tears can be treated by a sho period (2-4weeks)of immobilisation in a splint followed by icreasing movement. Complete tears need operative repair.Post operatively,the joint is immobilized in a thumb slint for 6 weeks,but can be moved early in the flexion-extension phase. Ref: Maheshwari and Mhaskar 9th ed pg 122