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Does Bearing Design Influence Midterm Survivorship of Unicompartmental Arthroplasty?

  • Symposium: Papers Presented at the Annual Meetings of the Knee Society
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

Medial unicompartmental arthroplasties (UKA) are available with mobile- and fixed-bearing designs, with the advantages of one bearing over another unproven. We questioned whether the bearing design influenced clinical outcome, survivorship, the reason for revision, or the timing of failures. We retrospectively reviewed 179 patients (229 knees) who had medial unicompartmental knee arthroplasties between 1990 and 2007; of these 79 knees had a mobile-bearing design and 150 knees a fixed-bearing design. Patients with mobile-bearing UKA had a minimum followup of 1 year (mean, 3.6 years; range, 1–11.3 years); those with fixed-bearing UKA a minimum followup of 1 year (mean, 8.1 years; range, 1–17.8 years). Patients were evaluated with clinical outcome scores and radiographically using the Knee Society rating system. Seven of 79 (9%) mobile-bearing knees underwent revision at a mean of 2.6 years, and 22 of 150 (15%) fixed-bearing knees underwent revision at a mean of 6.9 years. The 5-year cumulative survival rates were 88% (SE ± 0.47, 95% CI 0.7229–1) and 96% (SE ± 0.16, 95% CI 0.93–0.9979) for the mobile- and fixed-bearing designs respectively using the endpoint of revision surgery. We observed no differences in the indications or complexity of revision surgery between the groups and none in midterm survivorship.

Level of Evidence: Level III, comparative study. See Guidelines for Authors for a complete description of levels of evidence.

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Acknowledgments

We thank Dr. C.H. Rorabeck for his patient contributions and Amarpreet Sanghera, Julie Marr, and Jeff Guerin for their help in the preparation of the manuscript.

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Correspondence to John-Paul Whittaker MB ChB, FRCS (T&O).

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Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution has approved the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

This work was performed at the University Hospital, London Health Sciences Centre, London, Ontario, Canada.

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Whittaker, JP., Naudie, D.D.R., McAuley, J.P. et al. Does Bearing Design Influence Midterm Survivorship of Unicompartmental Arthroplasty?. Clin Orthop Relat Res 468, 73–81 (2010). https://doi.org/10.1007/s11999-009-0975-7

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