title: High flex total knee arthroplasty--a prospective, randomized study with results after 10 years.
abstract: This prospective randomized study compares the long term results between total knee arthroplasty with a mobile bearing high flex and a fixed bearing posterior stabilized knee (LPS) in 39 patients. The Hospital for Special Surgery score (HSS) was calculated and radiographs in AP and lateral view were analyzed after a minimum follow-up of 10 years. No significant differences between the two groups were found. The mean HSS-score was 90.67 (+/- 5.75) for LPS group patients and 90.83 (+/- 8.57) points for the high flex group patients. Three patients in the high flex group had undergone a reoperation on their knee. One knee was revised for painful mid-flexion instability and the others for symptomatic aseptic loosening of the tibial prosthesis. Based on these and other findings, the use of a high flex knee system may be seriously re-considered. Further studies are required to evaluate possible long-term adverse effects of high flex knee systems.
authors.affiliation: Department of Orthopaedic Surgery Martin Luther University Halle-Wittenberg, Germany. florian.radetzki@uk-halle.de
authors.forename: Florian
authors.initials: F
authors.lastname: Radetzki
authors.affiliation: Institute of Medical Epidemiology, Biostatistics and Informatics, Martin Luther University Halle-Wittenberg, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Wienke
authors.affiliation: Department of Orthopaedic Surgery Martin Luther University Halle-Wittenberg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Mendel
authors.affiliation: Department of Orthopaedic Surgery Martin Luther University Halle-Wittenberg, Germany.
authors.forename: Natalia
authors.initials: N
authors.lastname: Gutteck
authors.affiliation: Department of Orthopaedic Surgery Martin Luther University Halle-Wittenberg, Germany.
authors.forename: Karl-Stefan
authors.initials: KS
authors.lastname: Delank
authors.affiliation: Department of Orthopaedic Surgery Martin Luther University Halle-Wittenberg, Germany.
authors.forename: David
authors.initials: D
authors.lastname: Wohlrab
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D016059:Range of Motion, Articular; D012086:Reoperation; D016896:Treatment Outcome