[A female patient with a weak, painful thumb].

Here we present the case of a 64-year-old female patient with a painful thumb. This case demonstrates how, with proper physical examination, a correct diagnosis of 'skier's thumb' with concomitant Stener lesion can be made. This condition is a tear of the ulnar collateral ligament (UCL) of the metacarpophalangeal joint with an interposition of the UCL and the aponeurosis adductor pollicis muscle. It is usually treated surgically.