title: Early results of a domed tibia, mobile bearing lateral unicompartmental knee arthroplasty from an independent centre.
abstract: OBJECTIVE
  The aim of this study is to determine the short-term outcome of lateral unicompartmental knee arthroplasty (UKA) using a domed tibia, mobile bearing prosthesis. The primary outcome measure was revision due to bearing dislocation and the secondary measure was functional outcome.
  
  
  METHODS
  From 2005 to 2009, a total of 64 knees, in 58 patients, were identified as having the domed tibia, mobile bearing lateral UKA with a minimum 2-year follow-up. Forty-one females and 17 males with a mean age of 71years (range 44 to 92, median 72) were reviewed. The mean follow-up period was 38months (range 24 to 61, median 36). The primary outcome measure was re-operation and revision rate, particularly due to bearing dislocation. The secondary outcome assessed was a patient reported outcome measure (PROM) using the Oxford Knee Score (OKS) and compared using Student's Paired T-test.
  
  
  RESULTS
  There were four knees that underwent further surgery for any reason. Two patients required revision of the implant (3.1%). There were no cases of bearing dislocation in this series. The mean pre-operative OKS was 24 (range 9 to 36) and the mean post-operative score was 42 (range 23 to 48 p<0.0001).
  
  
  CONCLUSIONS
  This study from an independent centre, reporting on the short-term results of the domed tibia, mobile bearing lateral UKA supports the safety and efficacy of the procedure as a treatment option in the patients with lateral compartment osteoarthritis (OA) of the knee.
  
  
  METHODS
  This is a level 4; case series study.
authors.affiliation: Musculoskeletal Surgery Section, Division of Surgery, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, St Dunstan's Road, Charing Cross Campus, London W6 8RP, United Kingdom.
authors.forename: Altay O
authors.initials: AO
authors.lastname: Altuntas
authors.forename: Helen
authors.initials: H
authors.lastname: Alsop
authors.forename: Justin P
authors.initials: JP
authors.lastname: Cobb
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects / Q000379:methods; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D020127:Recovery of Function; D012086:Reoperation / Q000379:methods; D012189:Retrospective Studies; D018570:Risk Assessment; D013977:Tibia / Q000601:surgery; D013997:Time Factors; D016896:Treatment Outcome; D006113:United Kingdom