title: [Experience with medial unicompartmental prostheses with a mobile plateau].
abstract: BACKGROUND
  Unicompartmental knee arthroplasty (UKA) has become an accepted therapy for medial osteoarthritis. The main reasons for its popularity are the minimally invasive surgical technique and the reports of excellent long-term results including high patient satisfaction and good knee joint function especially in younger patients.
  
  
  OBJECTIVE
  The purpose of our retrospective study was to evaluate the physical activities of patients who had undergone an Oxford III medial UKA. Special attention was paid to implant positioning and osteoarthritis of the patellofemoral joint.
  
  
  METHODS
  Of 181 implanted Oxford III prosthesis, 136 (75.1%) could be followed up. The mean age at time of surgery was 65.2 years; the average time of follow-up was 4.2 years. In addition to a physical examination and x-ray, the following scores were obtained: WOMAC (Western Ontario and McMaster Osteoarthritis Index), OKS (Oxford Knee Score), KSS (Knee Society Score), UCLA activity and the Turba score.
  
  
  RESULTS
  The majority of the patients (81%) returned to their sporting activity following knee surgery. Higher complication rates or progression of osteoarthritis associated with sporting activities were not observed. The active patients had significantly higher scores for the OKS, KSS, WOMAC, and UCLA scores. The correct implant position, especially avoiding overcorrection to valgus malalignment, is important for good clinical outcome.
  
  
  CONCLUSIONS
  Our results demonstrate that a high degree of patient satisfaction in terms of physical and sporting activity can be achieved using the Oxford III UKA for medial osteoarthritis without an increased risk for complications.
authors.affiliation: Klinik und Poliklinik für Orthopädie, Physikalische Medizin und Rehabilitation, Ludwig-Maximilians-Universität Campus-Großhadern, Marchioninistraße 15, 81377, München, Deutschland, matthias.pietschmann@med.uni-muenchen.de.
authors.forename: M F
authors.initials: MF
authors.lastname: Pietschmann
authors.forename: P
authors.initials: P
authors.lastname: Weber
authors.forename: A
authors.initials: A
authors.lastname: Steinbrück
authors.forename: L
authors.initials: L
authors.lastname: Wohlleb
authors.forename: V
authors.initials: V
authors.lastname: Jansson
authors.forename: P E
authors.initials: PE
authors.lastname: Müller
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods*; D019544:Equipment Failure Analysis; D006801:Humans; D007720:Knee Prosthesis; D020370:Osteoarthritis, Knee / Q000175:diagnosis* / Q000601:surgery*; D057071:Patellofemoral Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D011474:Prosthesis Design; D011859:Radiography; D020127:Recovery of Function; D012189:Retrospective Studies; D016896:Treatment Outcome