title: Metal backed fixed-bearing unicondylar knee arthroplasties using minimal invasive surgery: a promising outcome analysis of 132 cases.
abstract: BACKGROUND
  Unicondylar knee arthroplasty (UKA) is a well-established treatment for isolated osteoarthritis (OA) of the medial knee compartment. Aim of this retrospective study was to evaluate the early clinical and radiological outcomes of a consecutive series of patients treated with medial metal backed fixed-bearing UKA. Furthermore, the influence of the component orientation on the outcome was analyzed.
  
  
  METHODS
  From 09/2006 to 11/2010 106 patients (132 knees; 69 ± 9 years) were treated using a metal backed fixed-bearing UKA with a MIS approach. All patients underwent a standardized clinical and radiological follow-up at 6 weeks, 1, 2 and 5 years. Mean follow-up was 3.4 ± 1.0 years. Two patients (three UKAs) deceased and two patients (two UKAs) were lost to follow-up. Three different survival analyses were performed using three different endpoints defining failure: (a) revision with exchange of any UKA component (b) aseptic loosening and (c), a worst case scenario, where it was assumed that all progressive radiolucencies would lead to aseptic loosening and thus these were additionally counted. Clinical outcome was assessed using the American knee society score (AKS) and the Oxford knee score (OKS). Radiographic analysis was done according to the American Knee Society Evaluation and Scoring System adapted for UKA and correlated with the AKS and OKS.
  
  
  RESULTS
  Five UKAs (3.8 %) were revised to total knee arthroplasties (TKAs) after a median of 25 (10-33) months. Five year survival was 95.2, 97.5 and 87.7% for the aforementioned endpoints. At final follow-up the median AKS knee score was 99 (50-100) points and the median AKS function score was 100 (60-100) points. The median OKS was 43 (8-48) points. Clinical outcome was independent of the component orientation.
  
  
  CONCLUSIONS
  Fixed-bearing UKA showed excellent clinical and radiological results at up to 5 years follow-up. Outcome was independent of component orientation.
authors.affiliation: Kantonsspital Baselland, Clinics for Orthopaedics and Trauma Surgery, Rheinstrasse 26, CH-4410, Liestal, Switzerland. mail@joelbaur.ch.
authors.forename: Joel
authors.initials: J
authors.lastname: Baur
authors.affiliation: Kantonsspital Baselland, Clinics for Orthopaedics and Trauma Surgery, Rheinstrasse 26, CH-4410, Liestal, Switzerland. lukas.zwicky@ksbl.ch.
authors.forename: Lukas
authors.initials: L
authors.lastname: Zwicky
authors.affiliation: Kantonsspital Baselland, Clinics for Orthopaedics and Trauma Surgery, Rheinstrasse 26, CH-4410, Liestal, Switzerland. michael.hirschmann@ksbl.ch.
authors.forename: Michael Tobias
authors.initials: MT
authors.lastname: Hirschmann
authors.affiliation: Kantonsspital Baselland, Clinics for Orthopaedics and Trauma Surgery, Rheinstrasse 26, CH-4410, Liestal, Switzerland. tilchmann@leonardo-ortho.ch.|Leonardo - Klinik Birshof, CH-4142, Muenchenstein, Switzerland. tilchmann@leonardo-ortho.ch.
authors.forename: Thomas
authors.initials: T
authors.lastname: Ilchmann
authors.affiliation: Kantonsspital Baselland, Clinics for Orthopaedics and Trauma Surgery, Rheinstrasse 26, CH-4410, Liestal, Switzerland. martin.clauss@ksbl.ch.
authors.forename: Martin
authors.initials: M
authors.lastname: Clauss
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods* / Q000639:trends*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D007720:Knee Prosthesis / Q000639:trends*; D008297:Male; D008670:Metals; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000379:methods* / Q000639:trends*; D011446:Prospective Studies; D011474:Prosthesis Design / Q000379:methods / Q000639:trends; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D008670:Metals