We have treated four patients with rupture of one or more digital
extensor tendons following a distal ulnar resection for a traumatic
problem. The rupture was caused by the abrasive effect of the distal part
of the ulna at the site of resection during pronation and supination. Two
patients were treated with a silicone-rubber prosthesis ad tendon grafts
and two, with resection of an ulnar bone spike and local tendon transfers.
Tendon rupture is best avoided by strict adherence to the surgical
technique described by Darrach. If rupture of the tendon occurs,
reconstructive procedures must be devised to repair the individual lesion
found at operation.