title: Is overcorrection preferable for repair of degenerated articular cartilage after open-wedge high tibial osteotomy?
abstract: OBJECTIVE
  This study was performed to determine whether the overcorrected knee could obtain a higher ratio of articular cartilage repair in the medial compartment of the femorotibial joint after open-wedge high tibial osteotomy (HTO). The hypothesis of the study was that overcorrected knees had a higher ratio of articular cartilage repair than moderately corrected knees.
  
  
  METHODS
  A total of 71 knees that underwent arthroscopy to evaluate the articular cartilage during open-wedge HTO and second-look arthroscopy were reviewed. The articular cartilage was classified as no repair or repair according to Koshino et al. Overcorrection was defined as knees with femorotibial angle ≤166°.
  
  
  RESULTS
  Second-look arthroscopy was performed 410 ± 64 days after HTO. Based on arthroscopic observations, 45 knees (63.4 %) showed no repair and 26 knees (36.6 %) showed repair. In terms of the ratio of cartilage repair, there was no difference between overcorrected knees with mean femorotibial angle of 165° ± 1° and moderately corrected knees with mean femorotibial angle of 170° ± 2° (n.s.).
  
  
  CONCLUSIONS
  No significant differences were found in the ratio of cartilage repair between overcorrected and moderately corrected knees.
  
  
  METHODS
  Retrospective comparative study, Level III.
authors.affiliation: Department of Orthopaedic Surgery, Nekoyama Miyao Hospital, 14-7 Konan, Chuo-ku, Niigata, Niigata, 950-1151, Japan. s8058@nms.ac.jp.
authors.forename: Sachiyuki
authors.initials: S
authors.lastname: Tsukada
authors.affiliation: Department of Orthopaedic Surgery, Nekoyama Miyao Hospital, 14-7 Konan, Chuo-ku, Niigata, Niigata, 950-1151, Japan.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Wakui
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D001182:Arthroscopy; D002358:Cartilage, Articular / Q000382:microbiology / Q000601:surgery*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010027:Osteotomy; D012189:Retrospective Studies; D024162:Second-Look Surgery; D013264:Stifle; D013977:Tibia / Q000601:surgery*; D014945:Wound Healing
keywords: Cartilage; Knee; Navigation; Osteoarthritis; Osteotomy