[Osseous avulsion of the opponens pollicis muscle. Case report of a rare injury in skiing].

Two cases in which the M. opponens pollicis was ruptured with a bony fragment are reported. In each case the injury, which occurred in young people (24-29 years of age), was the outcome of a fall during alpine skiing, whereby the hand hit the icy slope. Operative treatment was necessary due to the intense subjective pain which followed a significant thenar hematoma.