title: [Simulated Total Wrist Fusion and its Influence on Hand Grip Function].
abstract: BACKGROUND
  Wrist fusion is still a common treatment for patients with advanced stage arthritis. Since patients are often intimidated by the functional limitations, we intended to evaluate the influence of the lack of wrist motion in different positions on the dynamic grip function and the grip strength of the hand.
  
  
  METHODS
  We simulated wrist fusion in 20° extension and 20° flexion and evaluated the following grip types: fist closure, 2 different power grips, pinch grip and precision grip. A TUB sensor glove was used, which allowed us to dynamically record the range of motion (ROM) of the finger joints as well as grip strength. Nineteen healthy subjects participated and all types of grips were performed using a standardised protocol with and without simulated wrist fusion.
  
  
  RESULTS
  Lack of wrist motion in 20° extension had no relevant effect on the fingers' ROM, grip speed or strength. Simulated fusion in 20° flexion also had no influence on ROM or grip speed, rejecting our hypothesis that a tenodesis effect of the extensors in flexion would decrease ROM in the finger joints and grip speed. However, we were able to show a significant decrease of grip strength in flexion compared with extension or healthy wrists. The decrease averaged between 23 and 42% of healthy values, depending on the grip type. There was no change in strength distribution among the fingers.
  
  
  CONCLUSIONS
  We didn't find any impact of lack of wrist motion on finger movement during forceful hand grip at normal speed. However, a significant loss of grip strength in flexed position of the wrist joint should be considered in patients with an indication for bilateral wrist fusion.
authors: Klinik für Unfall-, Hand-, Plastische- und Wiederherstellungschirurgie, Universitätsklinik Ulm, Ulm.
authors: J
authors: J
authors: Gülke
authors: Klinik für Neurochirurgie, Universitätsklinik Ulm, Ulm.
authors: H
authors: H
authors: Schöll
authors: Klinik für Unfall-, Hand-, Plastische- und Wiederherstellungschirurgie, Universitätsklinik Ulm, Ulm.
authors: T
authors: T
authors: Kapapa
authors: Klinik für Neurochirurgie, Universitätsklinik Ulm, Ulm.
authors: T
authors: T
authors: Geyer
authors: Klinik für Unfall-, Hand-, Plastische- und Wiederherstellungschirurgie, Universitätsklinik Ulm, Ulm.
authors: M
authors: M
authors: Mentzel
authors: Klinik für Handchirurgie, Plastische und Mikrochirurgie, Katharinenhospital, Klinikum Stuttgart, Stuttgart.
authors: N J
authors: NJ
authors: Wachter
mesh_terms: D005384:Finger Joint; D018737:Hand Strength; D006801:Humans; D019637:Orthopedic Procedures; D016059:Range of Motion, Articular; D014953:Wrist; D014955:Wrist Joint / Q000601:surgery*