title: High tibial osteotomy with use of the Taylor Spatial Frame external fixator for osteoarthritis of the knee.
abstract: BACKGROUND
  High tibial osteotomy (HTO) is used to treat medial compartment osteoarthritis of the knee in active patients with varus alignment. In this study we review the clinical and radiographic outcomes associated with the Taylor Spatial Frame (Smith & Nephew), and its use in HTOs, and we include an illustrative case report.
  
  
  METHODS
  In 7 patients with medial compartment osteoarthritis of the knee and varus alignment, the Taylor Spatial Frame was applied to the tibia in the operating room and a proximal tibial osteotomy was performed. Patients followed a computer-generated turning schedule until the desired correction was achieved. The frame was removed when the osteotomy site had healed. The lower extremity measure (LEM) was used to assess physical function. Clinical outcome measures relating to the Taylor Spatial Frame included latency, time to correction, time in the frame, number of residual corrections and complications. Radiographic outcomes included preoperative Resnick grades of osteoarthritis, pre- and post-correction limb alignment and tibial slope measurements.
  
  
  RESULTS
  Average (and standard deviation) LEM grade at a mean 41 (14) months follow-up after correction was 94% (5%). Average latency was 8 days, time to correction was 15 days, time in the frame was 23 weeks and number of residual corrections was 1.3. Complications were similar to those for external fixators. Radiographic correction goals were met in all patients.
  
  
  CONCLUSIONS
  The Taylor Spatial Frame is a valuable asset when using HTO to treat medial compartment osteoarthritis of the knee.
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, London Health Sciences Centre - Victoria Campus, University of Western Ontario, London, ON.
authors.forename: Darius G
authors.initials: DG
authors.lastname: Viskontas
authors.forename: Mark D
authors.initials: MD
authors.lastname: MacLeod
authors.forename: David W
authors.initials: DW
authors.lastname: Sanders
mesh_terms: D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000601:surgery*; D004867:Equipment Design; D016267:External Fixators; D006801:Humans; D016916:Joint Deformities, Acquired / Q000209:etiology / Q000601:surgery; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D011859:Radiography; D012189:Retrospective Studies; D013977:Tibia / Q000601:surgery*