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04-07-2019

Impact of comorbidities and functional impairment on 5-year loss of health utility in patients with lower-limb osteoarthritis in the KHOALA cohort

Authors: Abdou Y. Omorou, Hamza Achit, Maud Wieczorek, Jacques Pouchot, Bruno Fautrel, Anne-Christine Rat, Francis Guillemin

Published in: Quality of Life Research | Issue 11/2019

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Abstract

Purpose

To examine the respective and combined impact of “hypothetical” functional impairment (FI) and burden of comorbidities accrual on a 5-year risk of health utility (HU) loss in osteoarthritis (OA).

Methods

Participants of the Knee and Hip Osteoarthritis Long-term Assessment (KHOALA) study with a 5-year follow-up were included. FI, number of comorbidities and HU were measured annually by the WOMAC, Functional Comorbidity Index and Short-Form 6D, respectively. We estimated the population risk of HU loss (PRD: population risk difference, PRR: population risk ratio) under hypothetical FI and comorbidities using the parametric G-formula. Then, mediation analysis investigated the causal mechanism of comorbidities on HU through FI by estimating total, direct and indirect effects.

Results

We examined data from 767 patients (68.8% women; 61.6 years). The estimated 5-year risk of HU loss was 47.5% [41.9; 52.2] under natural course and 24.9% [15.5; 34.2] when imposing “Patient acceptable function and No comorbidity” corresponding to a PRD = − 22.6 [− 26.5; − 21.2] and a PRR = 0.5 [0.4; 0.6]. The estimated total risk of HU loss comparing “Two comorbidities” versus “No comorbidity” was significant without mediation effect of FI: Total = 10.1% [6.8; 12.9]; direct = 8.0% [2.7; 13.1]; indirect = 2.1% [− 2.0; 5.2].

Conclusions

FI and comorbidities are important and independent determinants of HU loss in patient with OA. Half of cases (50%) of HU loss during 5 years could be avoided by preventing comorbidities (30%) and limiting FI under patient acceptable function (20%). Caregivers should additionally pay close attention to the prevention and the treatment of comorbidities in routine management of OA.

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Title: Impact of comorbidities and functional impairment on 5-year loss of health utility in patients with lower-limb osteoarthritis in the KHOALA cohort
Authors: Abdou Y. Omorou
Hamza Achit
Maud Wieczorek
Jacques Pouchot
Bruno Fautrel
Anne-Christine Rat
Francis Guillemin
Publication date: 04-07-2019
Publisher: Springer International Publishing
Published in: Quality of Life Research / Issue 11/2019
Print ISSN: 0962-9343
Electronic ISSN: 1573-2649
DOI: https://doi.org/10.1007/s11136-019-02243-4

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Abstract

Purpose

Methods

Results

Conclusions

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