title: Complications after medial opening wedge high tibial osteotomy.
abstract: OBJECTIVE
  The purpose of this study was to investigate complications of the medial opening wedge high tibial osteotomy (HTO) procedure at our institution.
  
  
  METHODS
  All cases of medial opening wedge HTO performed between 2001 and 2004 at our institution were identified. Medical records, operative reports, and radiographs were retrospectively reviewed for all patients who experienced a complication within 12 months postsurgery. All complications were identified for analysis.
  
  
  RESULTS
  Forty-six patients were included in this study; 17 (36.9%) patients had a documented complication. There were 7 patients (15.2%) with loss of correction, 2 (4.3%) with intraoperative lateral cortex fractures, 2 (4.3%) with postoperative lateral cortex fractures, 2 (4.3%) with deep venous thrombosis, 2 (4.3%) with delayed unions, and 2 (4.3%) with symptomatic hardware. Patients with a loss of angular correction had a greater body mass index (BMI) than those without a loss of correction (mean BMI, 32.5 v 28.8; P = .0416). Of the 7 patients with loss of angular correction, 6 had a first-generation fixation device and 1 had a second-generation device. There was no apparent association between delayed union and graft type (allograft v autograft).
  
  
  CONCLUSIONS
  The medial opening wedge HTO is associated with a moderate frequency of complications. The frequency and type of complications seem to be similar to those reported for the lateral closing technique. Although there are technical advantages offered by the medial opening wedge HTO, their influence on the frequency and type of complications experienced by patients in our series was not apparent.
  
  
  METHODS
  Level IV, case series.
authors.affiliation: MedSport, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan 48106, USA. bsmiller@umich.edu
authors.forename: Bruce S
authors.initials: BS
authors.lastname: Miller
authors.forename: Brian
authors.initials: B
authors.lastname: Downie
authors.forename: E Barry
authors.initials: EB
authors.lastname: McDonough
authors.forename: Edward M
authors.initials: EM
authors.lastname: Wojtys
mesh_terms: D000293:Adolescent; D000328:Adult; D001860:Bone Plates; D016025:Bone Transplantation; D003161:Compartment Syndromes / Q000453:epidemiology / Q000209:etiology; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010027:Osteotomy; D020427:Peroneal Neuropathies / Q000453:epidemiology / Q000209:etiology; D011150:Popliteal Artery / Q000293:injuries; D011183:Postoperative Complications / Q000453:epidemiology* / Q000209:etiology; D011542:Pseudarthrosis / Q000453:epidemiology / Q000209:etiology; D011655:Pulmonary Embolism / Q000453:epidemiology / Q000209:etiology; D012189:Retrospective Studies; D013530:Surgical Wound Infection / Q000453:epidemiology; D013924:Thrombophlebitis / Q000453:epidemiology / Q000209:etiology; D013977:Tibia / Q000601:surgery*; D013978:Tibial Fractures / Q000453:epidemiology / Q000209:etiology; D014184:Transplantation, Homologous; D055815:Young Adult