title: Effectiveness of four-corner arthrodesis with use of a locked dorsal circular plate.
abstract: BACKGROUND
  Compared with traditional methods of fixation in four-corner arthrodesis, reviews of results using a dorsal circular plate (DCP) have identified higher complication rates. As the use of circular plate fixation for limited wrist arthrodesis was found to be a valuable concept per se and continued innovation and technical advancement are crucial to improve future treatment, changes in plate design were encouraged.
  
  
  OBJECTIVE
  To further evaluate the use of DCP fixation in four-corner arthrodesis, we report the first results using a radiolucent, nonmetallic (polyetheretherketone), locked DCP for four-corner arthrodesis.
  
  
  METHODS
  We retrospectively analyzed the clinical and radiographic results of 24 patients who underwent four-corner arthrodesis with a locked DCP at a minimum followup of 63 months (mean, 76 months; range, 63-91 months). There were nine women and 15 men, with a mean age of 53 years (range, 37-78 years) at the time of surgery. We evaluated ROM with a goniometer and grip strength with a dynamometer. Function was assessed using QuickDASH. Radiographs were evaluated for union, carpal alignment, and hardware problems.
  
  
  RESULTS
  At latest followup, ROM averaged 66% and 77% of the uninjured side in flexion-extension and radioulnar deviation, respectively. Grip strength averaged 70% of the uninjured side. The average postoperative QuickDASH score was 19.11. Union was achieved by 22 of the 24 patients.
  
  
  CONCLUSIONS
  Our data show four-corner arthrodesis with a radiolucent, nonmetallic, locked DCP is an effective procedure that allows stable primary fixation as a basis for good functional outcome, provided surgical technique and quality of bone graft are adequate.
  
  
  METHODS
  Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
authors.affiliation: Department of Orthopaedic Surgery, Innsbruck Medical University, Anichstrasse 35, 6020, Innsbruck, Austria. matthias.luegmair@gmx.at
authors.forename: Matthias
authors.initials: M
authors.lastname: Luegmair
authors.forename: Patrick
authors.initials: P
authors.lastname: Houvet
mesh_terms: D000328:Adult; D000368:Aged; D001174:Arthrodesis / Q000295:instrumentation* / Q000379:methods*; D001860:Bone Plates; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000601:surgery*; D011474:Prosthesis Design; D012189:Retrospective Studies; D014955:Wrist Joint / Q000601:surgery*