title: Ulnar styloid fixation in the treatment of posttraumatic instability of the radioulnar joint: a biomechanical study with clinical correlation.
abstract: Biomechanical displacement testing was done on nine fresh human upper extremities to define the stabilizing influence of the triangular fibrocartilage on the radioulnar joint and the efficacy of triangular fibrocartilage-ulnar styloid avulsion fracture repair in restoring lost stability. Test data confirmed that the triangular fibrocartilage is a major stabilizer of the radioulnar joint and internal fixation of triangular fibrocartilage-ulnar styloid avulsion fractures can restore preavulsion stability in all positions of forearm rotation. On the basis of this data and a successful clinical experience, primary repair of displaced ulnar styloid avulsion fractures is advised as a means of stabilizing the radioulnar joint and preventing the disability associated with chronic radioulnar joint instability.
authors.affiliation: M.S. Hershey Medical Center, Pennsylvania State University, Division of Orthopaedic Surgery, Hershey 17033.
authors.forename: J A
authors.initials: JA
authors.lastname: Shaw
authors.forename: A
authors.initials: A
authors.lastname: Bruno
authors.forename: E M
authors.initials: EM
authors.lastname: Paul
mesh_terms: D001696:Biomechanical Phenomena; D004550:Elbow / Q000503:physiopathology*; D005592:Fracture Fixation; D006801:Humans; D006811:Humerus / Q000503:physiopathology*; D007593:Joint Instability / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D009068:Movement / Q000502:physiology*; D014458:Ulna Fractures / Q000150:complications / Q000503:physiopathology / Q000628:therapy*