Abstract
Purpose
The cemented Exeter V40 stem is known to migrate distally. Several previous studies have reported on the extent of stem migration and its influence on clinical outcome. However, no studies have investigated the influence of stem migration on Patient Reported Outcome Measures (PROM).
Methods
One hundred and twelve total hip arthroplasties (THA) were included in a 2-year follow-up using Radiostereometric Analysis (RSA). Patients were evaluated using the Oxford Hip Score (OHS) and EQ-5D-3L PROMs. The purpose of this study was to assess the influence of stem migration, measured by Maximum Total Point Motion (MTPM), on the 2-year postoperative score (OHS and EQ-5D). Furthermore, the influence of pre-operative PROM, age, gender, acetabular component and BMI was associated with the 2-year postoperative OHS and EQ-5D scores.
Results
MTPM was a non-significant predictor of the 2-year postoperative OHS (regression coefficient (B) = − 2.38 (CI − 5.44; .69)) and of the 2-year postoperative EQ-5D (B = − .01 (CI − .04; .02)). The only significant predictor of the 2-year postoperative OHS and 2-year postoperative EQ-5D was gender (B = 8.71 (CI 3.52; 13.90)) and (B = .13 (CI .07; .18)), respectively.
Conclusion
Stem migration did not significantly influence PROMs at 2 years post-operatively. Using a patient-focused approach, our results seem to corroborate results reported by previous studies, showing that slow migration of the Exeter V40 stem does not seem to influence the clinical outcome.
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Availability of data and materials
Data are available from corresponding author on request.
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Acknowledgements
The authors thank Eric Garling for providing the RSA models, Kirsten Duch for vetting the statistical analysis, Heidi Ladefoged Poulsen for performing the RSA analyses and Merete Hessellund for technical support.
Funding
This study was supported by Innovation Fund Denmark. Grant No: 69-2013-1.
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This study was approved by the Ethics Committee of the North Jutland Region, and the National Data Protection Agency RN2015-141.
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Steiner, D.K., Drivsholm, N.S., Buchardt, S.T.E. et al. The influence of migration of the exeter V40 stem on patient reported outcome measures: a 2-year follow-up of 112 total hip arthroplasties using radiostereometric analysis. Eur J Orthop Surg Traumatol 32, 167–174 (2022). https://doi.org/10.1007/s00590-021-02937-x
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DOI: https://doi.org/10.1007/s00590-021-02937-x