Pathologic rupture of flexor tendons due to longstanding Kienb?ck's disease

A 62-year-old man was seen for rupture of the flexor digitorum superficialis and profundus to the index finger. X-ray films showed longstanding Kienb?ck's disease with a completely fragmented lunate bone with fragments lying in front of the anterior lip of the radius. Tendon transfer restored active flexion to the index finger.