title: Survival analysis and functional outcome of the Oxford unicompartmental knee replacement up to 11 years follow up at a District General Hospital.
abstract: BACKGROUND
  There have been several large originator studies reporting excellent results with this prosthesis but far fewer large independent studies. We present, to our knowledge, the largest independent series documenting excellent survivorship rates and good functional outcomes at a mean follow up of 5.5 years post implantation of the Oxford unicompartmental knee replacement.
  
  
  METHODS
  Our prospective study looks at the survivorship and the functional outcome of 364 Oxford UKRs performed in a district general hospital at a mean follow up of 5.5 years (range 5-11 years). Post operatively knees were assessed in a research clinic using the Oxford knees score (as well as the American Knee Society Score and the Hospital for Special Surgery Score). Maximal flexion was also measured.
  
  
  RESULTS
  There were 26 revisions of 364 knees giving a survivorship, with revision as the end point, of 93% at a mean of 5.5 years post op (range 5-11 years). We achieved an Oxford score of 37.5, a mean AKSS of 161 (divided as American knee functional score 75.75/American knee objective score 85.4 (excellent)). The mean HSS score was 84.5. We achieved 'Excellent' Oxford knee scores in 137 knees (48%), 'Good' in 75 (26%), 'Moderate' in 51 (17%) and 'Poor' in only 27 (9%) of knees. Mean improvement in functional scores were: Oxford score (14.4), AKSS (71) and HSS (26.3). Mean maximal flexion was 123° range (110-140).
  
  
  CONCLUSIONS
  We have confirmed that good medium to long-term function and survival can be obtained following Oxford medial knee replacement for treating anteromedial osteoarthritis, in our large independent series.
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: M
authors.initials: M
authors.lastname: Edmondson
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: A
authors.initials: A
authors.lastname: Atrey
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: D
authors.initials: D
authors.lastname: East
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: N
authors.initials: N
authors.lastname: Ellens
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: K
authors.initials: K
authors.lastname: Miles
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: R
authors.initials: R
authors.lastname: Goddard
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: H
authors.initials: H
authors.lastname: Apthorp
authors.affiliation: Conquest Hospital, East Sussex TN37 7RD, UK.
authors.forename: A
authors.initials: A
authors.lastname: Butler-Manuel
keywords: Functional outcome; Oxford unicompartmental knee; Survival