title: Gait analysis and electromyography in fixed- and mobile-bearing total knee replacement: a prospective, comparative study.
abstract: OBJECTIVE
  The theoretical superiority of mobile-bearing total knee arthroplasties (TKAs) has not yet been proven in clinical studies. The aim of the current study was to compare and to analyse in a patient population that had received either a fixed or a mobile TKA differences in gait analysis electromyography and clinical scores.
  
  
  METHODS
  In a prospective, randomized, patient- and observer-blinded clinical study, 33 patients with primary osteoarthritis of the knee were included. All patients received a Genesis II total knee replacement. Sixteen patients received a mobile and 17 a fixed-bearing cruciate retaining Genesis II TKA. Clinical and quality-of-life scores, electromyography and gait analysis were applied preoperatively and postoperatively with a follow-up of 24 months.
  
  
  RESULTS
  In both groups, improvements from pre- to postoperative were detected. whereas the results of gait analysis and electromyography did not show any differences. The results from the clinical and the quality-of-life scores improved from pre- to postoperative, while the Knee Society Score showed a superiority of the mobile-bearing group (mean 159 ± 28) over the fixed-bearing group (mean 134 ± 41).
  
  
  CONCLUSIONS
  No functional advantage of mobile over fixed-bearing TKA was detected, although the mobile-bearing group had better clinical results for which a reason could not be found. These results only apply to cruciate retaining mobile-bearing TKA with a bearing which allows both rotation and anteroposterior translation.
authors.affiliation: Sporthopaedicum Straubing, Bahnhofplatz 8, 94315, Straubing, Germany. carsten@tibesku.de
authors.forename: Carsten O
authors.initials: CO
authors.lastname: Tibesku
authors.forename: Kiriakos
authors.initials: K
authors.lastname: Daniilidis
authors.forename: Adrian
authors.initials: A
authors.lastname: Skwara
authors.forename: Tobias
authors.initials: T
authors.lastname: Dierkes
authors.forename: Dieter
authors.initials: D
authors.lastname: Rosenbaum
authors.forename: Susanne
authors.initials: S
authors.lastname: Fuchs-Winkelmann
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D004576:Electromyography; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology* / Q000601:surgery*; D011446:Prospective Studies; D011788:Quality of Life; D018709:Statistics, Nonparametric; D016896:Treatment Outcome; D016474:Weight-Bearing