Attrition of the Extensor Tendon of the Index Finger Following an Avulsion Fracture of the Third Metacarpal.

We report an avulsion fracture at the base of the third metacarpal involving the extensor carpi radialis brevis insertion and a resulting complication of attritional rupture of the extensor indicis proprius tendon and the extensor digitorum communis to the index finger, in a 67-year-old man.