[Comparison of the results between reconstruction of the extensor pollicis longus tendon using a free interposition tendon graft and extensor indicis transposition].

QUESTION Is there a difference in the results of free tendon grafting or transfer of the extensor indicis tendon for the reconstruction of the extensor pollicis longus tendon? PATIENTS AND METHODS Two groups of patients, who underwent surgery between 1992 and 1998, were compared. From 58 patients with tendon grafts 48 were re-examined. For reconstruction, a graft harvested from the palmaris longus tendon was applied that was woven into the proximal and distal stump of the extensor pollicis tendon according to the technique of Pulvertaft. From 56 patients with transfer of the extensor indicis tendon, 40 were re-examined. The extensor indicis transfer was performed by the standard technique. Extension and flexion of the metacarpophalangeal and interphalangeal joints of the thumb, retroposition, abduction and opposition were examined. In addition, the span of the hand, grip strength and pinch strength were measured. A summarising assessment was performed according to the Geldmacher score, the subjective impairment was assessed by the DASH score. RESULTS Both groups were comparable according to demographic data and aetiology of the rupture. The range of motion was nearly identical after both surgical techniques. Range of motion of the joints of the thumb, abduction and opposition reached normal values but both methods restored only 60 % of the normal retroposition. According to the Geldmacher score, both methods showed good and excellent results. The DASH score resulted in low values with 10 and, respectively, 14 points. After extensor indicis transfer all patients demonstrated isolated extension of the index. CONCLUSIONS Both methods establish equally good results. Free tendon grafting is technically more demanding but preserves a more powerful isolated extension of the index finger and should, therefore, be preferred in patients with special demands on this function (e.g., musicians). The transfer of the extensor indicis tendon is technically less demanding, requires retraining and may impair the isolated function of the index finger.