title: Is High-Flexion Total Knee Arthroplasty a Valid Concept? Bilateral Comparison With Standard Total Knee Arthroplasty.
abstract: The purpose of this study was to determine whether the high-flexion total knee prosthesis significantly improves knee flexion in vivo.
  
  
  
  Forty-four patients undergoing same-day bilateral total knee arthroplasty for primary osteoarthritis of both knees were randomized to receive a standard posterior-stabilized knee prosthesis (P.F.C. Sigma; DePuy Johnson & Johnson, Warsaw, IN) in one knee and a high-flexion concept posterior-stabilized knee prosthesis (LOSPA; Corentec, Inc, Seoul, Korea) in the other knee and were followed up for 2 years postoperatively.
  
  
  
  The mean postoperative range of motion was 128.8° (range, 100°-144°) in the LOSPA group and 128.5° (range, 100°-142°) in the P.F.C. Sigma group (P = .744). There were no significant differences in the postoperative mean Knee Society score and Western Ontario and McMaster Universities Osteoarthritis Index score between the LOSPA and P.F.C. Sigma groups (P = .839 and P = .972, respectively).
  
  
  
  Despite theoretical range of motion advantages of high-flexion prosthesis, there were no group differences with regard to range of motion, clinical outcomes, and the incidence of radiolucent lines at final follow-up assessment.
authors.affiliation: Department of Orthopaedic Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: Man Soo
authors.initials: MS
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: Ju Hwan
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: In Jun
authors.initials: IJ
authors.lastname: Koh
authors.affiliation: Department of Orthopaedic Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: Sung Won
authors.initials: SW
authors.lastname: Jang
authors.affiliation: Department of Orthopaedic Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: Da Hoon
authors.initials: DH
authors.lastname: Jeong
authors.affiliation: Department of Orthopaedic Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: Yong
authors.initials: Y
authors.lastname: In
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D007720:Knee Prosthesis / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011184:Postoperative Period; D011446:Prospective Studies; D016059:Range of Motion, Articular
keywords: knee implant design; outcomes; randomized clinical trial; range of motion; total knee arthroplasty