title: Opening-wedge high tibial osteotomy with a locked low-profile plate: surgical technique.
abstract: BACKGROUND
  High tibial osteotomy has been recognized as a beneficial treatment for osteoarthritis of the medial compartment of the knee. The purpose of this prospective study was to assess the short-term results of opening-wedge high tibial osteotomies with locked plate fixation.
  
  
  METHODS
  From September 2002 to November 2005, fifty-one consecutive medial opening-wedge high tibial osteotomies were performed. The mean age of the patients at the time of the index operation was forty-nine years. The preoperative and postoperative factors analyzed included the grade of arthritis of the tibiofemoral compartment (the Ahlbäck radiographic grade), the anatomic tibiofemoral angle, patellar height, the Hospital for Special Surgery rating system score, and the Lysholm and Gillquist knee score.
  
  
  RESULTS
  Postoperatively, one superficial wound infection occurred. Fifty of the fifty-one osteotomies healed after an average period of 12.9 weeks (range, eight to sixteen weeks) without bone grafts. A nonunion developed in a sixty-two-year-old patient who was a cigarette smoker. The average postoperative tibiofemoral angle was 9° of valgus. Forty-nine patients were followed for a mean of fifty-two months. The average score on the Hospital for Special Surgery rating system was 86 points at the time of the most recent follow-up. The rating was excellent in twenty-eight patients (57%), good in twelve (24%), fair in four (8%), and poor in five (10%). The average score on the Lysholm and Gillquist knee-scoring scale was 83 points. According to these scores, the outcome was excellent in nine patients (18%), good in thirty-one (63%), fair in three (6%), and poor in six (12%). Four knees failed after an average of thirty-six months.
  
  
  CONCLUSIONS
  Our results suggest that an opening-wedge high tibial osteotomy with locked plate fixation allows a correct valgus angle to be achieved with good short-term results.
authors.affiliation: Department of Trauma Surgery, Bethesda Hospital, Hohenheimer Strasse 21, 70184 Stuttgart, Germany. drwerner.kolb@t-online.de
authors.forename: Werner
authors.initials: W
authors.lastname: Kolb
authors.forename: Hanno
authors.initials: H
authors.lastname: Guhlmann
authors.forename: Christoph
authors.initials: C
authors.lastname: Windisch
authors.forename: Heiko
authors.initials: H
authors.lastname: Koller
authors.forename: Paul
authors.initials: P
authors.lastname: Grützner
authors.forename: Klaus
authors.initials: K
authors.lastname: Kolb
mesh_terms: D000368:Aged; D001860:Bone Plates; D001864:Bone Wires; D004838:Epiphyses / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery*; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000503:physiopathology; D011446:Prospective Studies; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D020127:Recovery of Function; D018570:Risk Assessment; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery*; D016896:Treatment Outcome