Restoration of thumb opposition (opponensplasty).

The authors review the therapeutic principles that must be applied when restoring the thumb opposition surgically. Among the many surgical techniques, five are featured: transfer of the flexor digitorum superficialis of the third or fourth finger, transfer of the extensor indicis proprius, transfer of the palmaris longus, translocation of the flexor palmaris longus tendon, transfer of the extensor pollicis longus. After summarizing the procedures, they emphasize the practical points that must be respected. This surgery, which cannot restore sensitivity, requires a precise assessment of the patient's wishes and information on what can be really expected.