Paper 51: The Early Failure Of The Oxford Phase 3 Cemented Medial Unicompartmental Knee Joint Arthroplasty. An Audit of The New Zealand Joint Registry Over Eight Years

Tregonning, R.; Hartnett, Nigel; Hobbs, Toni; Purdie, Gordon; Rothwell, Alastair G.

doi:10.1016/j.arthro.2012.05.534

Cited by 2 publications

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“…those performing one/month or more) had a revision rate comparable to TKA. Those performing > 12 per year had a revision rate of 0.99%, those performing 8-11 per year had revision rates of 4%, those performing 2-7 per year 6.4% and those performing 1 per y had an 8% revision rate [ 26 ].…”

Section: Discussionmentioning

confidence: 99%

Oxford unicompartmental knee arthroplasty: medial pain and functional outcome in the medium term

Edmondson

Isaac

Wijeratna

et al. 2011

Journal of Orthopaedic Surgery and Research

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BackgroundIn our experience results of the Oxford unicompartmental knee replacement have not been as good as had been expected. A common post operative complaint is of persistent medial knee discomfort, it is not clear why this phenomenon occurs and we have attempted to address this in our study.Methods48 patients were retrospectively identified at a mean of 4.5 years (range = 3 to 6 years) following consecutive Oxford medial Unicompartmental Knee arthroplasties for varus anteromedial osteoarthritis. The mean age at implantation was 67 years (range 57-86). Of these 48 patients, 4 had died, 4 had undergone revision of their unicompartmental knee replacements and 2 had been lost to follow up leaving 38 patients with 40 replaced knees available for analysis using the 'new Oxford Knee Score' questionnaire. During assessment patients were asked specifically whether or not they still experienced medial knee discomfort or pain.ResultsThe mean 'Oxford score' was only 32.7 (range = 16 to 48) and 22 of the 40 knees were uncomfortable or painful medially.The accuracy of component positioning was recorded, using standard post operative xrays, by summing the angulation or displacement of each component in two planes from the ideal position (according to the 'Oxford knee system radiographic criteria'). No correlation was demonstrated between the radiographic scores and the 'Oxford scores', or with the presence or absence of medial knee discomfort or pain.ConclusionIn our hands the functional outcome following Oxford Unicompartmental knee replacement was variable, with a high incidence of medial knee discomfort which did not correlate with the postoperative radiographic scores, pre-op arthritis and positioning of the prosthesis.

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Section: Discussionmentioning

confidence: 99%

Oxford unicompartmental knee arthroplasty: medial pain and functional outcome in the medium term

Edmondson

Isaac

Wijeratna

et al. 2011

Journal of Orthopaedic Surgery and Research

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“…Surgeon experience is essential for the attainment of good results in UKA [ 26 ]. The reported revision rates for UKA are 0.99% for UKA conducted by surgeons performing > 12 UKAs per year, 4.6% for those performing 8 to 11 UKAs per year, 6.4% for those performing 2 to 7 UKAs per year, and 8.3% for those performing 1 UKA per year [ 27 ]. In addition, a study evaluating the published long-term outcomes of > 8000 medial Oxford Phase 3 UKAs reported that very good outcomes were achieved by both designer and non-designer surgeons, and that the annual revision rate was 0.74% [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

A meta-analysis of unicompartmental knee arthroplasty revised to total knee arthroplasty versus primary total knee arthroplasty

Sun¹,

Su²

2018

J Orthop Surg Res

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BackgroundThis study was performed to compare the clinical outcomes of unicompartmental knee arthroplasty (UKA) revised to total knee arthroplasty (TKA) versus primary TKA.MethodsRelevant trials were identified via a search of the Cochrane Central Register of Controlled Trials and PubMed from inception to 17 June 2017. A meta-analysis was performed to compare postoperative outcomes between revised UKA and primary TKA with respect to the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, Knee Society Score (KSS), mean polyethylene thickness, hospital stay, revision rate, range of motion (ROM), and complications.ResultsFive of 233 studies involving 536 adult patients (revised UKA group, n = 209; primary TKA group, n = 327) were eligible for inclusion in the meta-analysis. The primary TKA group had better WOMAC scores, KSS, and ROM than the revised UKA group (P < 0.05). Compared with primary TKA, revision of UKA to TKA required more augments, stems, and bone grafts and a thicker polyethylene component (P < 0.05). There were no significant differences between the two groups in the revision rate, hospital stay, or complications (P > 0.05).ConclusionConversion of UKA to TKA is associated with poorer clinical outcomes than primary TKA. Furthermore, we believe that conversion of UKA to TKA is more complicated than performing primary TKA. Revision UKA often requires more augments, stems, and bone grafts and thicker polyethylene components than primary TKA. However, patients who undergo conversion of UKA to TKA have similar hospital stay, complications, and revision rate as patients who undergo primary TKA.

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Paper 51: The Early Failure Of The Oxford Phase 3 Cemented Medial Unicompartmental Knee Joint Arthroplasty. An Audit of The New Zealand Joint Registry Over Eight Years

Cited by 2 publications

References 0 publications

Oxford unicompartmental knee arthroplasty: medial pain and functional outcome in the medium term

Oxford unicompartmental knee arthroplasty: medial pain and functional outcome in the medium term

A meta-analysis of unicompartmental knee arthroplasty revised to total knee arthroplasty versus primary total knee arthroplasty

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