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The risk of bearing dislocation in lateral unicompartmental knee arthroplasty using a mobile biconcave design

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

A safety study was conducted on a cohort of 25 patients who underwent lateral unicompartmental arthroplasty with a biconcave mobile-bearing insert.

Methods

The first 25 lateral mobile-bearing unicompartmental knee replacements, performed in a general hospital by one surgeon, were prospectively reviewed, with a minimum follow-up of 1 year.

Results

One bearing dislocation occurred 4 months postsurgery. The Oxford knee score improved in all patients from a preoperative mean of 23.3 (range 8–40, SD 8.4) to a postoperative mean of 42.1 (range 23–48, SD 6.7). General patient satisfaction at a mean follow-up of 20 months was excellent in 84 %, good in 12 % and fair in 4 %. The mechanical axis as a measure on full-leg standing radiographs improved from 5.7° valgus (range 1°–16°, SD 4.1°) to 1.7° valgus (7° to −3°, SD 2.1°). Mechanical alignment correction averaged 4.0° (range −1° to 15°, SD 3.9°).

Conclusion

The mobile biconcave insert design in the lateral unicompartmental knee replacement seems appropriate as a innovative, anatomy imitating solution, resulting in a good clinical outcome. Still, bearing dislocation remains a concern, especially in extended indication.

Level of evidence

Case series, Level IV.

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Acknowledgments

The authors thank Iris Woytowicz for her translation assistance and Steffen Fieuws for the statistical analysis of the data. No funds were received in support of this work. No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript. The authors have no conflicts of interest that are directly relevant to this article.

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Authors and Affiliations

  1. General Hospital Sint-Lucas Bruges, Sint-Lucaslaan 29, 8310, Brugge, Belgium

    Sebastiaan Schelfaut, Lucas Beckers & Jan Victor

  2. Division of Orthopaedics, Department of Musculoskeletal Sciences, University Hospital Leuven, Weligerveld 1, 3212, Pellenberg, Belgium

    Sebastiaan Schelfaut, Lucas Beckers & Johan Bellemans

  3. University Hospital Ghent, De Pintelaan 185, 9000, Ghent, Belgium

    Peter Verdonk & Jan Victor

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  1. Sebastiaan Schelfaut
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  2. Lucas Beckers
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Correspondence to Sebastiaan Schelfaut.

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Schelfaut, S., Beckers, L., Verdonk, P. et al. The risk of bearing dislocation in lateral unicompartmental knee arthroplasty using a mobile biconcave design. Knee Surg Sports Traumatol Arthrosc 21, 2487–2494 (2013). https://doi.org/10.1007/s00167-012-2171-7

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