title: Is range of motion after cruciate-retaining total knee arthroplasty influenced by prosthesis design? A prospective randomized trial.
abstract: Improvement in knee flexion is a major expectation for many patients undergoing total knee arthroplasty (TKA). One hundred and twenty two patients were randomized to receive a cruciate-retaining standard or high-flexion TKA. Range of motion (ROM) and functional outcomes were assessed. The high flexion implants had a greater intraoperative ROM than standard implants. The mean flexion preoperatively, intraoperatively and at the one year follow-up was 107.4°, 123.0° and 108.9° in the standard group and 109.9°, 129.1° and 109.7° in the high-flexion TKA group. These differences were not significant preoperatively and at follow-up, but intraoperatively (P < 0.001). In multivariate analysis preoperative knee flexion was the only significant factor influencing knee flexion at follow-up. No differences in the Knee Society Score or SF 36 were observed.
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Carl Gustav Carus, Medical Faculty of the Technical University of Dresden, Dresden, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Lützner
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Carl Gustav Carus, Medical Faculty of the Technical University of Dresden, Dresden, Germany.
authors.forename: Albrecht
authors.initials: A
authors.lastname: Hartmann
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Carl Gustav Carus, Medical Faculty of the Technical University of Dresden, Dresden, Germany.
authors.forename: Cornelia
authors.initials: C
authors.lastname: Lützner
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Carl Gustav Carus, Medical Faculty of the Technical University of Dresden, Dresden, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Kirschner
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D016119:Posterior Cruciate Ligament / Q000601:surgery; D011474:Prosthesis Design; D016059:Range of Motion, Articular
keywords: design; range of motion; results; total knee arthroplasty