title: Open-wedge high tibial osteotomy versus unicompartmental knee arthroplasty: no difference in progression of patellofemoral joint arthritis.
abstract: OBJECTIVE
  The purpose of this retrospective comparative study was to evaluate and compare, radiographically and clinically, progression of osteoarthritis (OA) in the patellofemoral (PF) compartment after open-wedge high tibial osteotomy (OWHTO), and unicompartmental knee arthroplasty (UKA) over a minimum follow-up of 5 years.
  
  
  METHODS
  In this study, 42 knees in an OWHTO group were compared with 59 knees in a UKA group in terms of radiographic parameters, such as the grading system for OA progression in the PF compartment, and clinical parameters, such as the PF pain and function scores over a minimum follow-up of 5 years.
  
  
  RESULTS
  There was no significant difference of OA progression in the PF compartment between the two groups on knee radiography. Compared with the preoperative grades, the UKA group showed significant progression of OA in the medial PF compartment at the final follow-up, whereas the medial PF compartment showed significant stepwise progression by only one grade when compared to the OWHTO group. The PF pain and function scores showed no statistical differences between the two groups at the final follow-up, regardless of OA progression.
  
  
  CONCLUSIONS
  There was no significant difference between OWHTO and UKA in terms of progression of OA in the PF compartment or deterioration of PF function score over a minimum follow-up of 5 years. However, the medial PF compartment of the UKA group was minimal, and worsened or progressed by only one grade.
  
  
  METHODS
  III.
authors.affiliation: Department of Orthopaedic Surgery, KonKuk University Medical Center, KonKuk University School of Medicne, Seoul, South Korea.
authors.forename: Kwang-Jun
authors.initials: KJ
authors.lastname: Oh
authors.affiliation: Department of Orthopaedic Surgery, IIsan Paik Hospital, Inje University, Goyang, South Korea.
authors.forename: Young Chan
authors.initials: YC
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, KS Hospital, Ansan, South Korea.
authors.forename: Jong Seong
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, IIsan Paik Hospital, Inje University, Goyang, South Korea.
authors.forename: Yong Suk
authors.initials: YS
authors.lastname: Chang
authors.affiliation: Department of Orhopaedic Surgery, Mullaji Knee Clinic, Mumbai, India.
authors.forename: Gautam M
authors.initials: GM
authors.lastname: Shetty
authors.affiliation: Department of Orthopaedic Surgery, IIsan Paik Hospital, Inje University, Goyang, South Korea. kwnhamj@hotmail.com.
authors.forename: Kyung Wook
authors.identifier: http://orcid.org/0000-0002-6946-9259
authors.initials: KW
authors.lastname: Nha
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D018450:Disease Progression; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery*; D010027:Osteotomy / Q000379:methods*; D057071:Patellofemoral Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D012189:Retrospective Studies
keywords: High tibial osteotomy; Patellofemoral osteoarthritis; Unicompartmental knee arthroplasty