Radioulnar Instability and Ulnar Stump Stabilization in Distal Radio Ulnar Joint Arthritis: A Cadaver Study

Background: Salvage procedures for distal radioulnar joint (DRUJ) arthritis, like the Darrach or Sauvé-Kapandji (S-K) procedures, often result in extensor tendon ruptures at ulnar stump. Radioulnar instability is considered underlying cause and stump stabilization techniques are employed. This study investigated instability, irritation, effectiveness of following salvage procedures. Methods: Six upper limbs from three cadavers were used. Forearm rotation was measured using magnetic position sensors to assess radial movement. The procedure performed on two limbs, comparing motion ranges different osteotomy positions. risk rupture assessed with applied weight. S-K four evaluating movement distance underweight. Results: Proximal positions increased range. Extensor irritation occurred when load volar sides, particularly a pronated forearm. Stump did not significantly contribute stabilization. Conclusions: DRUJ led potential complications. Load application especially forearm, rupture. showed limited utility stabilizing reducing These findings can inform strategies minimizing complications