The cemented twin-peg Oxford partial knee replacement survivorship: A cohort study

• A twin peg cemented Oxford knee replacement version is now available.
• Until now there has been no survivorship for comparison with the single peg.
• This paper shows good survivorship and patient reported outcomes.
• Improved fixation of this version is associated with fewer revisions in our practice.
• We recommend the twin peg Oxford unicompartmental knee for anteromedial osteoarthritis.

BackgroundA new twin-peg version of the Oxford knee was introduced in 2003. However, until now there has been no information about its survivorship. The aim of this study was to determine the survivorship, and the patients' perception of outcome over time.MethodsA cohort of all patients treated from 2003 until 2009 using the twin-peg Oxford partial knee was contacted. The main indication for treatment was anteromedial osteoarthritis (AMOA). The Oxford Knee Score (OKS), American Knee Society Functional (AKS-F) score and satisfaction rate were obtained, and the time-to-failure was used to perform a survival analysis.ResultsThere were 249 patients treated, with 288 medial cemented implants. Of these, 248 patients with 287 implants could be contacted and implant survival or failure was verified. Their mean age was 67 years (range: 34–94). The mean follow-up time was 5.1 years (maximum: 9.2). The nine years cumulative implant survival rate for all cases using revision for any reason to define failure was 98% (95% CI, 84 to 100). There were no cases of femoral loosening. The mean OKS was 22 pre-operatively, 41 at two years, and 41 at final review, at which point 96% of patients were very or fairly pleased with the result.ConclusionThe survivorship of the twin-peg knee was better than that of the single peg knee at our centre, and appeared no worse than the results of the single peg knee at the originating centre. It can offer secure femoral fixation, sustained clinical benefit and patient satisfaction.Level of evidenceLevel IV case-series.