[Aptis Prosthesis for the Treatment of Painful Instability of the Ulnar Stump Following Wide Excision of the Distal ulna].

We report the case of 35-year-old woman with severe Madelung's deformity. Having undergone a Kapandji-Sauvé-procedure with wide excision of the distal ulna, the patient suffered from painful instability of the ulnar stump. Although a corrective osteotomy of the distal radius had been performed, severe ulnar inclination of the distal radius remained, leaving persisting pain. Implantation of a constrained distal radioulnar joint prosthesis combined with a renewed extraarticular corrective osteotomy of the distal radius was performed. The peg of the radial plate of the prosthesis was placed in the screw hole of the large-fragment lag screw removed after the Kapandji-Sauvé-procedure.