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J Arthroplasty. 2013 Oct;28(9):1571-4. doi: 10.1016/j.arth.2013.02.003. Epub 2013 Mar 26.

Bone loss during revision of unicompartmental to total knee arthroplasty: an analysis of implanted polyethylene thickness from the National Joint Registry data.

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  • 1Department of Trauma and Orthopaedic Surgery, Chelsea and Westminster Hospital, London, UK.


Using the National Joint Registry (UK) database, we compared the thickness of polyethylene (PE) and the level of constraint used during primary total knee arthroplasty (TKA) versus the revision of unicondylar knee arthroplasty (UKA) to TKA. A total of 251,803 TKA procedures and 374 revision UKA-TKA procedures between 2003 and 2009 were reviewed. The commonest PE size used in TKA was 10mm, compared to 12.79 mm in the revision group. The use of constrained knee implant was required in 2.15% of primary TKA and 4.19% of UKA to TKA revisions. The revision of UKA to TKA is a more complex procedure compared to primary TKA, with a higher incidence of using constrained implants and thicker PE inserts. These findings may be useful for surgeons in their decision making.

Copyright © 2013 Elsevier Inc. All rights reserved.


adult reconstruction; bone loss; joint Registry; polyethylene; revision; total knee arthroplasty; unicompartmental knee arthroplasty

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