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The Risk of Revision After TKA Is Affected by Previous HTO or UKA

  • Symposium: 2014 Knee Society Proceedings
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

Background

High tibial osteotomy (HTO) and unicompartmental arthroplasty (UKA) are reconstructive surgeries advocated for younger patients. In case of failure or progression of osteoarthritis, they can both be converted to a total knee arthroplasty (TKA).

Questions/purposes

We used registry data to answer if the risks of revision for TKAs after previous HTOs and UKAs differ and how these compare with that of de novo TKAs. Furthermore, we wanted to examine the extent of stemmed/revision implants being used for the conversions.

Methods

We identified HTOs performed during 1998 to 2007 with the help of the inpatient and outpatient care registries of the Swedish National Board of Health and Welfare and gathered relevant information from hospital records. The Swedish Knee Arthroplasty Register was then examined to find all de novo TKAs, TKAs performed after HTO, and TKAs performed after UKA through the end of 2012.

Results

For 920 TKAs after previous UKA and 356 TKAs after previous closed-wedge HTOs, we found the risk of revision significantly higher than for the 118,229 de novo TKAs (risk ratio, 2.8; confidence interval [CI], 2.2–3.5; p < 0.001, and 1.7 CI, 1.1–2.6; p < 0.001, respectively), whereas for the 482 open-wedge osteotomies, the difference was not significant (risk ratio, 1.2; CI, 0.8–1.8; p = 0.44). Stemmed implants were used in 663 of the 117,566 primary de novo TKAs (0.6%), in 22 of the 809 HTO conversions (4%) and in 136 of the 920 UKA conversions (17%).

Conclusions

TKAs after previous reconstructive surgery carry an increased risk for revision. However, our findings do not mitigate against the use of UKA and HTO in selected cases.

Level of Evidence

Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

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Acknowledgments

We thank the contact surgeons, secretaries, and operating staff who helped gather the information needed to maintain the SKAR.

Author information

Authors and Affiliations

  1. Department of Orthopaedics and Clinical Sciences, SUS/Lund University Hospital, 22185, Lund, Sweden

    Otto Robertsson MD, PhD & Annette W-Dahl RN, PhD

Authors
  1. Otto Robertsson MD, PhD
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  2. Annette W-Dahl RN, PhD
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Corresponding author

Correspondence to Otto Robertsson MD, PhD.

Additional information

Funds were received in support of the research project described in this article from the Swedish Medical Research Council (MFR 09509), Stiftelsen för bistånd åt vanföra i Skåne, the National Board of Health and Welfare, the Swedish Association of Local Authorities and Regions, and the Medical Faculty.

All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research ® editors and board members are on file with the publication and can be viewed on request.

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Robertsson, O., W-Dahl, A. The Risk of Revision After TKA Is Affected by Previous HTO or UKA. Clin Orthop Relat Res 473, 90–93 (2015). https://doi.org/10.1007/s11999-014-3712-9

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  • DOI: https://doi.org/10.1007/s11999-014-3712-9

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