title: Change of gait in patients with lateral osteoarthritis of the knee after mobile-bearing unicompartmental knee arthroplasty.
abstract: OBJECTIVE
  Patients with lateral osteoarthritis of the knee suffer not only from pain but also impaired gait and limited mobility. Common treatment options are total knee replacement and lateral unicompartmental knee arthroplasty (UKA). The domed lateral mobile-bearing Oxford Uni is a new treatment option for patients with isolated osteoarthritis of the lateral compartment of the knee joint. We used instrumented gait analysis and clinical scores to study patients before and after lateral UKA.
  
  
  METHODS
  Nineteen patients suffering from lateral osteoarthritis underwent implantation of a mobile-bearing lateral UKA. They were examined in a gait analysis before the operation and after an average follow-up time of 7 months. Gait analysis was performed on a treadmill with six infrared cameras to identify gait characteristics (e.g. velocity, stride time, stride length, knee abduction or hip adduction).
  
  
  RESULTS
  Mean velocity changed from 0.58 to 0.73 m/s. Significant advancements were also found in knee abduction and hip adduction. Time and length of strides improved significantly as well as the clinical scores American Knee Society Score, Oxford-12, FFb-H-OA and Devane Score.
  
  
  CONCLUSIONS
  Patients with lateral osteoarthritis of the knee showed an impaired gait with an increased knee abduction and hip adduction angle. Implantation of a lateral mobile UKA can restore normal axis of the leg and improve gait and function of the knee. Instrumented gait analysis is a suitable measuring instrument to quantify and qualify the post-operative change of gait.
  
  
  METHODS
  II.
authors.affiliation: Department of Orthopaedics and Orthopaedic Surgery, University Hospital Giessen and Marburg (UKGM), Klinikstraße 33, 35392, Giessen, Germany, joernseeger@gmx.net.
authors.forename: J B
authors.initials: JB
authors.lastname: Seeger
authors.forename: J P
authors.initials: JP
authors.lastname: Schikschneit
authors.forename: C
authors.initials: C
authors.lastname: Schuld
authors.forename: R
authors.initials: R
authors.lastname: Rupp
authors.forename: S
authors.initials: S
authors.lastname: Jäger
authors.forename: H
authors.initials: H
authors.lastname: Schmitt
authors.forename: G S
authors.initials: GS
authors.lastname: Maier
authors.forename: M
authors.initials: M
authors.lastname: Clarius
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation; D005684:Gait; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D020370:Osteoarthritis, Knee / Q000503:physiopathology* / Q000601:surgery*; D016059:Range of Motion, Articular; D016896:Treatment Outcome