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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

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European Journal of Orthopaedic Surgery & Traumatology Aims and scope Submit manuscript

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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Correspondence to Daniel K. Steiner.

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The authors declare that they have no conflict of interest.

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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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Appendix

Appendix

See Tables 1, 2, 3.

Table 1 Gender was significantly associated with the 2-year OHS (dependent variable)
Table 2 Gender was significantly associated with the 2-year EQ-5D (dependent variable)
Table 3 Descriptive statistics of the dependent variables and independent variables

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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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