Locked Distal Ulna Volar Dislocation Associated with a Malunited Fracture of the Distal Radius.

 The volar dislocation of the distal ulna is an uncommon injury and often missed due to its rarity. If diagnosed early, it can be managed with a simple closed reduction followed by immobilization. Open reduction is recommended in case of any interposition preventing reduction.  In this case report, we present a rare case of neglected volar distal ulna dislocation associated with a distal radius fracture presenting with a fixed supination deformity that was managed successfully with a Sauvé- Kapandji procedure using a modified approach to restore forearm rotation. At 10 months, the patient had a good union at the distal radio ulnar joint (DRUJ) with improved forearm rotations.  no previous cases of neglected volar distal ulna dislocation with distal radius fracture has been reported in the literature.  If DRUJ stability cannot be restored after closed reduction of distal radius fracture, open reduction and internal fixation of the fracture should always be performed to avoid subsequent DRUJ subluxation/dislocations.