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Comparing the validity and responsiveness of the EQ-5D-5L to the Oxford hip and knee scores and SF-12 in osteoarthritis patients 1 year following total joint replacement

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Abstract

Purpose

(1) To assess responsiveness of the EQ-5D-5L compared to Oxford hip and knee scores and the SF-12 in osteoarthritis patients undergoing total hip (THR) or knee (TKR) replacement surgery; (2) to compare distribution and anchor-based methods of assessing responsiveness.

Methods

Questionnaires were mailed to consecutive patients following surgeon referral for primary THR or TKR and 1 year post-surgery. We assessed effect size (ES), standardized response mean (SRM), and standard error of measurement (SEM). Minimum important difference (MID) was the mean change in patients reporting somewhat better in hip or knee, health in general, and those who were satisfied with surgery (5-point scales). Responders were compared using MID versus 1 and 2SEM.

Results

The sample of 537 (50% TKR) was composed of 56% female with a mean age of 64 years (SD 10). EQ-5D-5L ES was 1.86 (THR) and 1.19 (TKR) compared to 3.00 and 2.05 for Oxford scores, respectively. MID for the EQ-5D-5L was 0.22 (THR) and 0.20 (TKR) for patients who rated their hip or knee as somewhat better. There was a wide variation in the MID and the percentage of responders, depending on the joint, method of assessment, and the outcome measure. The percent agreement of responder classification using 2SEM vs. MID ranged from 79.6 to 99.6% for the EQ-5D-5L and from 69.4 to 94.8% for the Oxford scores.

Conclusions

Responsiveness of the EQ-5D-5L was acceptable in TKR and THR. Caution should be taken in interpreting responder to TJR based on only one method of assessment.

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Acknowledgements

This study was funded by Canadian Institutes of Health Research (CIHR) (Grant #ETG92252) and Alberta Innovates-Health Solutions (Grant # 200700596). We thank the research personnel who were responsible for project management and data collection: Lynda Loucks, Sarah Tran, Allan Hennigar, Ammar Al Khudairy, and Michaela Wallace.

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Correspondence to Barbara L. Conner-Spady.

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The first author is a member of the EuroQol Group, a not-for-profit group that develops and distributes instruments that assess and value health.

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Conner-Spady, B.L., Marshall, D.A., Bohm, E. et al. Comparing the validity and responsiveness of the EQ-5D-5L to the Oxford hip and knee scores and SF-12 in osteoarthritis patients 1 year following total joint replacement. Qual Life Res 27, 1311–1322 (2018). https://doi.org/10.1007/s11136-018-1808-5

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