Treatment of dislocation of distal or proximal radioulnar joint, by open reduction, including either or both of the following (if performed): (a) styloid fracture; (b) triangular fibrocartilage complex repair; other than a service associated with a service to which another item in this Schedule applies if the service described in the other item is for the purpose of treating fracture or dislocation in the same region (H) (Anaes.) (Assist.)