Profundus tendon blockage: quadriga in finger amputations.

After finger amputations, spontaneous adhesions of the resected profundus tendon may occur in the finger stump or palm. Because of the normal interconnections of the profundus tendons, such adhesions can block the excursion of the profundus tendons to intact fingers, resulting in the quadriga syndrome, or profundus tendon blockage. This causes a decrease in the power and range of movement of the terminal joints of the uninjured fingers when they are fully flexed. Three degrees of severity of this weakness are described. The findings and results of surgery in 20 patients demonstrate that the condition is surgically correctable by release of the adherent profundus tendon of the amputated digit. Full active flexion and extension of the intact fingers in the early postoperative period after primary amputation should prevent them from developing profundus tendon blockage.