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Association of body mass index and clinical outcome 2 years after unicompartmental knee arthroplasty

  • Orthopaedic Surgery
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Unicompartmental knee arthroplasty (UKA) has gained in popularity during the last years. However, the body mass index (BMI) of patients undergoing UKA is controversially discussed in the literature. There is, moreover, a paucity of information available concerning the association of BMI with early clinical outcomes after UKA.

Materials and methods

We retrospectively reviewed the clinical data of 83 consecutive UKA, 2 years after surgery, and investigated the potential association of BMI and the outcome variables Knee Society Score (KSS), University of California at Los Angeles (UCLA) activity levels, anterior knee pain (AKP), range of motion, and implant failure.

Results

The KSS and UCLA significantly increased from 132 and 4.7 preoperatively to 187.5 and 7.1, respectively, after surgery. Knee flexion significantly improved from 123.7 to 128.4° and the prevalence of extension deficiencies significantly decreased from 28.9 to 15.7%. Three knees (3.6%) failed and were converted to total knee arthroplasty. Failures were not associated with increased BMI (P = 0.387). The BMI had no significant association with KSS values, UCLA levels, and implant failure. We found a weak negative correlation between BMI and postoperative knee flexion (r = −0.285, P = 0.009) and a moderate positive correlation between BMI and the intensity of AKP (r = 0.525, P < 0.001).

Conclusion

The results of the present study suggest that the BMI of patients undergoing UKA has no major impact on the early clinical outcome 2 years after surgery. There was, however, a definite correlation between the BMI and AKP. Longer follow-up is necessary to determine if overweight and obesity may increase revision rates after UKA.

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Acknowledgments

The authors thank PD Dr. Marius von Knoch for his support in the present study.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Joint Center, Schulthess Clinic, Lengghalde 2, 8008, Zurich, Switzerland

    Florian D. Naal, Carl Neuerburg, Fabian von Knoch, Stefan Preiss, Tomas Drobny & Urs Munzinger

  2. Department of Orthopaedic Surgery and Orthopaedic Sports Medicine, Technical University of Munich, Munich, Germany

    Gian M. Salzmann

  3. Institute of Medical Statistics and Epidemiology, Technical University of Munich, Munich, Germany

    Monika Kriner

Authors
  1. Florian D. Naal
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  2. Carl Neuerburg
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  3. Gian M. Salzmann
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  4. Monika Kriner
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  5. Fabian von Knoch
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  6. Stefan Preiss
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Correspondence to Florian D. Naal.

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Naal, F.D., Neuerburg, C., Salzmann, G.M. et al. Association of body mass index and clinical outcome 2 years after unicompartmental knee arthroplasty. Arch Orthop Trauma Surg 129, 463–468 (2009). https://doi.org/10.1007/s00402-008-0633-7

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  • DOI: https://doi.org/10.1007/s00402-008-0633-7

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