Lower limb alignment control: Is it more challenging in lateral compared to medial unicondylar knee arthroplasty?

Saker Khamaisy, Brian P. Gladnick, Denis Nam, Keith R. Reinhardt, Thomas J. Heyse, Andrew D. Pearle

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Introduction: Limb alignment after unicondylar knee arthroplasty (UKA) has a significant impact on outcomes. The literature lacks lateral UKA alignment studies, making our understanding of this issue based on medial UKA. Methods: We evaluated limb alignment in 241 patients who underwent medial (229 knees) or lateral (37 knees) UKA. Alignment was measured pre and postoperatively in radiographs and intra-operatively using a navigation system. We compared the percentage of over-correction and the difference between post-operative alignment and navigation measurement. Results: Percentage of overcorrection was significantly higher in the lateral UKAs (11%) compared to the medial UKAs (4%). In medial UKAs, the mean difference between the intraoperative alignment and the post-operative was 1.33°. This was significantly lower than the mean 1.86° difference in the lateral UKAs. Conclusions: Our data demonstrated an increased risk of "overcorrection," and greater difficulty in predicting postoperative alignment using computer navigation, when performing lateral UKAs compared to medial UKAs.

Original languageEnglish
Pages (from-to)347-350
Number of pages4
JournalKnee
Volume22
Issue number4
DOIs
StatePublished - 1 Sep 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V..

Keywords

  • Alignment
  • Knee arthroplasty
  • Navigation
  • Robotic
  • Unicondylar

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