Permissible limits of flexor digitorum profundus tendon advancement--an anatomic study.

Lacerations of the profundus tendon distal to the superficialis insertion can be treated by advancement of the proximal cut end of the tendon to its insertion. In the English-language literature, limits cited for the distance a profundus tendon can be safely advanced vary from 0.75 to 2.5 cm and appear to be based on clinical impressions. Our cadaver model suggested the degree of tendon advancement tolerable was 1 cm. A delicate balance exists in the profundus tendon system, and this should be considered when surgical advancement is contemplated.