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What Are the Benefits of Hip Resurfacing in Appropriate Patients? A Retrospective, Propensity Score-Matched Analysis

  • Alexander S. McLawhorn
  • Leonard T. BullerEmail author
  • Jason L. Blevins
  • Yuo Yu Lee
  • Edwin P. Su
Original Article

Abstract

Background

Hip arthritis is one of the major causes of disability worldwide. Hip resurfacing arthroplasty (HRA) has emerged in recent years as an alternative to total hip arthroplasty (THA), but complications of HRA have limited the patient population to younger male patients with primary osteoarthritis and large hip anatomy. How the functional benefits of HRA in this population compare with those of THA is not entirely clear.

Questions/Purposes

The primary aim of this study was to determine whether there were differences in hip disability and patient satisfaction with surgery between these two groups at 2 years after surgery, using patient-reported outcome measures (PROMs) and subjective measures of patient satisfaction. Additionally, we sought to determine whether there were differences in post-operative discharge disposition, revision rates, or adverse events.

Methods

We searched an institutional database to identify patients undergoing unilateral HRA or THA between January 2007 and July 2011 who met today’s recommended criteria for HRA: younger male patients with large-enough hip anatomy to make surgery viable (a femoral head of at least 48 mm in HRA patients and, in THA patients, an acetabular shell size of 54 mm, the minimum outer shell size that could accommodate a femoral head component of 48 mm; for matching purposes, acetabular shell size in THA was used as a surrogate for the femoral head size used in HRA). We used propensity score matching to control for potentially confounding pre-operative variables and administered the Hip Disability and Osteoarthritis Outcome Score (HOOS) survey, including its subdomains, at the 2-year mark. We also assessed differences between groups in Lower Extremity Activity Scale scores, 12-item Short Form Health Survey results, and answers regarding satisfaction with surgery. We calculated minimal detectable change, minimum clinically important change, and substantial clinical benefit using anchor-based techniques for multiple outcome measures.

Results

There were 251 patients in each group. HRA patients scored significantly higher than THA patients on the 2-year HOOS sports and recreation (92 versus 87, respectively) and on rates of overall satisfaction (94% versus 89%, respectively). The HRA group also had a greater chance of achieving minimum clinically important change (18.75 points) in the HOOS sports and recreation subdomains than the THA group (97% versus 91%). No significant difference was found in 6-month adverse event rates. HRA patients also had a significantly shorter mean hospital stay, a higher rate of discharge to home, and a lower incidence of a “significant” limp after surgery.

Conclusion

HRA may provide a functional benefit in sports and recreation and greater satisfaction in patients who meet the current criteria for HRA. Because these benefits may be small, pre-operative counseling should focus on balancing the possible functional benefits against the longer-term risks associated with metal-on-metal bearings.

Keywords

hip resurfacing arthroplasty propensity score post-operative satisfaction patient-reported outcome measures 

Notes

Compliance with Ethical Standards

Conflict of Interest

Alexander S. McLawhorn, MD, MBA; Leonard T. Buller, MD; Jason L. Blevins, MD; and Yuo-Yu Lee, MS, declare that they have no conflicts of interest. Edwin P. Su, MD, reports receiving grants, personal fees as a consultant, and non-financial support from Smith & Nephew; personal fees as a consultant and non-financial support from United Orthopedic Corp.; non-financial support from OrthAlign Inc.; and ownership and investment interest in Insight Medical Systems.

Human/Animal Rights

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2013.

Informed Consent

Informed consent was waived from all patients for being included in this study.

Required Author Forms

Disclosure forms provided by the authors are available with the online version of this article.

Supplementary material

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Copyright information

© Hospital for Special Surgery 2019

Authors and Affiliations

  1. 1.Division of Adult Reconstruction and Joint Replacement, Department of Orthopedic SurgeryHospital for Special SurgeryNew YorkUSA
  2. 2.Department of Orthopaedic SurgeryIndiana University School of MedicineIndianapolisUSA
  3. 3.Department of Epidemiology and BiostatisticsHospital for Special SurgeryNew YorkUSA

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