Journal article
The mid to long term outcomes of the Lateral Domed Oxford Unicompartmental knee replacement: An analysis from the National Joint Registry for England, Wales, Northern Ireland and the Isle of Man
- Abstract:
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Background:
Lateral unicompartmental knee replacement (UKR) is an alternative to total knee replacement for isolated lateral unicompartmental knee arthritis. The geometry and mechanics of the lateral compartment differ to the medial compartment with the Lateral Domed Oxford UKR designed to address this. We used National Joint Registry (NJR) data to report the mid to long term outcomes of this device.
Methods:
We performed a retrospective observational study using NJR data on 992 Lateral Domed Oxford UKRs implanted between 1 st January 2005 and 31 st December 2017. Outcomes of interest were implant survival and revision indications.
Results:
The 10 year cumulative implant survival rates were 88.6% (CI 85.3-91.2). When compared to <55 year age group, the 55-64, 65-74 and ≥75 groups had significantly lower revision rates (Hazard Ratio (HR)=0.56 (CI 0.32-0.98, p=0.04), HR 0.40 (CI 0.22-0.72, p=0.003) and HR 0.27 (CI 0.12-0.58, p=0.001) respectively). The obese group had significantly (p=0.04) increased revision risk compared to normal BMI (HR 2.33, CI 1.06-5.12). The commonest reasons for revision surgery were dislocation (n=23, 2.3%), pain (n=15, 1.5%) and aseptic loosening (n=14, 1.4%).
Conclusion:
The Lateral Domed Oxford UKR provides a good option for isolated lateral compartment osteoarthritis. However dislocation of the mobile bearing remains a problem, occurring in 2.3% of the patients and accounting for 30% of the revisions. To help prevent dislocation it is now possible to assess bearing stability intra-operatively and if very unstable to implant a compatible fixed bearing tibial component, without the need for further bone preparation.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Accepted manuscript, pdf, 282.7KB, Terms of use)
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- Publisher copy:
- 10.1016/j.arth.2020.07.031
Authors
- Publisher:
- Elsevier
- Journal:
- Journal of Arthroplasty More from this journal
- Volume:
- 36
- Issue:
- 1
- Pages:
- 107-111
- Publication date:
- 2020-07-16
- Acceptance date:
- 2020-07-13
- DOI:
- EISSN:
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1532-8406
- ISSN:
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0883-5403
- Language:
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English
- Keywords:
- Pubs id:
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1118705
- Local pid:
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pubs:1118705
- Deposit date:
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2020-07-14
- ARK identifier:
Terms of use
- Copyright holder:
- Elsevier
- Copyright date:
- 2020
- Rights statement:
- Copyright © 2020 Elsevier Inc. except certain content provided by third parties.
- Notes:
- This is the accepted manuscript version of the article, available under the terms of a Creative Commons, Attribution, Non-Commercial, No Derivatives licence. The final version is available online from Elsevier at: https://doi.org/10.1016/j.arth.2020.07.031
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