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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 3/2017

01-03-2017 | Knee

Obesity has no effect on outcomes following unicompartmental knee arthroplasty

Authors: Johannes F. Plate, Marco A. Augart, Thorsten M. Seyler, Daniel N. Bracey, Aneitra Hoggard, Michael Akbar, Riyaz H. Jinnah, Gary G. Poehling

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 3/2017

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Abstract

Purpose

Although obesity has historically been described as a contraindication to UKA, improved outcomes with modern UKA implant designs have challenged this perception. The purpose of this study was to assess the influence of obesity on the outcomes of UKA with a robotic-assisted system at a minimum follow-up of 24 months with the hypothesis that obesity has no effect on robotic-assisted UKA outcomes.

Methods

There were 746 medial robotic-assisted UKAs (672 patients) with a mean age of 64 years (SD 11) and a mean follow-up time of 34.6 months (SD 7.8). Mean overall body mass index (BMI) was 32.1 kg/m2 (SD 6.5), and patients were stratified into seven weight categories according to the World Health Organization classification.

Results

Patient BMI did not influence the rate of revision surgery to TKA (5.8 %) or conversion from InLay to OnLay design (1.7 %, n.s.). Mean postoperative Oxford knee score was 37 (SD 11) without correlation with BMI (n.s.). The type of prosthesis (InLay/OnLay) regardless of BMI had no influence on revision rate (n.s.). BMI did not influence 90-day readmissions (4.4 %, n.s.), but showed significant correlation with higher opioid medication requirements and a higher number of physical therapy session needed to reach discharge goals (p = 0.031).

Conclusion

These findings suggest that BMI does not influence clinical outcomes and readmission rates of robotic-assisted UKA at mid-term. The classic contraindication of BMI >30 kg/m2 may not be justified with the use of modern UKA designs or techniques.

Level of evidence

IV.
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Metadata
Title
Obesity has no effect on outcomes following unicompartmental knee arthroplasty
Authors
Johannes F. Plate
Marco A. Augart
Thorsten M. Seyler
Daniel N. Bracey
Aneitra Hoggard
Michael Akbar
Riyaz H. Jinnah
Gary G. Poehling
Publication date
01-03-2017
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 3/2017
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-015-3597-5

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