title: Prospective evaluation of a new plate fixator for valgus-producing medial open-wedge high tibial osteotomy.
abstract: OBJECTIVE
  The purpose of this study was to prospectively evaluate the clinical, radiographic, and sports-related outcome at 24 months after valgus-producing medial open-wedge high tibial osteotomy (owHTO) using a 2nd generation peek-carbon composite plate.
  
  
  METHODS
  Between 2010 and 2011, the 2nd generation PEEKPower HTO-Plate(®) was used for medial owHTO in 28 consecutive patients (19 men, 9 women; mean age ± SD: 45 ± 11 years; mean varus deviation ± SD: 4° ± 2°). All of the patients had an osteotomy gap height of ≤12 mm without bone grafting. Visual analog scale (VAS) for pain, WOMAC score, and Lysholm score were evaluated preoperatively and at 12 and 24 months postoperatively. Sports-related outcomes included the Tegner scale, and a self-designed questionnaire preoperatively and 24 months postoperatively. Fixation stability of the implant was evaluated radiographically in two planes by comparing the medial proximal tibial angle (MPTA) and tibial slope 2 days after medial owHTO (baseline measurements) and after implant removal (follow-up measurements). Complications were recorded during the whole study period.
  
  
  RESULTS
  Compared to preoperative conditions, VAS, WOMAC, and Lysholm scores improved significantly (p < 0.05) at the 12- and 24-month follow-up. No significant differences were found between the 12- and 24-month follow-up. After 24 months, the sports frequency increased significantly (p < 0.05). No significant differences between baseline and follow-up measurements for the MPTA and tibial slope were observed. Total complication rate was 4 %, with one patient developing non-union.
  
  
  CONCLUSIONS
  In the clinical practice, the 2nd generation PEEKPower HTO-Plate(®) is a safe and efficient implant for medial owHTO without bone grafting in patients with an osteotomy gap of ≤12 mm.
  
  
  METHODS
  III.
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Cotic
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.|Department of Orthopaedic Sports Medicine, Hessing Stiftung Augsburg, Augsburg, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Vogt
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.|Department of Orthopedic Surgery and Traumatology, University Hospital Freiburg, Freiburg, Germany.
authors.forename: Matthias J
authors.initials: MJ
authors.lastname: Feucht
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.|Department of Trauma and Orthopaedic Surgery, Berufsgenossenschaftliche Unfallklinik Murnau, Murnau, Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Saier
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Minzlaff
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.|Sportsclinic Germany GmbH, Munich, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Hinterwimmer
authors.affiliation: Department of Orthopaedic Sports Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany. a.imhoff@lrz.tum.de.
authors.forename: Andreas B
authors.initials: AB
authors.lastname: Imhoff
mesh_terms: D000328:Adult; D001860:Bone Plates; D020878:Device Removal; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010027:Osteotomy / Q000295:instrumentation*; D011446:Prospective Studies; D013977:Tibia / Q000601:surgery*
keywords: 2nd generation PEEKPower HTO-Plate; High tibial osteotomy; Open wedge; Plate fixator