Abstract
Objective
The Duruöz Hand Index (DHI) is a valuable scale developed for evaluating hand functions of patients with rheumatoid arthritis and subsequently proven to be valid and reliable in various diseases. This study aims to investigate the validity and reliability of the DHI in patients with psoriatic arthritis (PsA).
Methods
Patients diagnosed with PsA according to CASPAR criteria were enrolled. The demographic, clinical, and functional characteristics of patients were evaluated. Functional assessment was performed with DHI, Hand Functional Index, Health Assessment Questionnaire, and VAS-disability scale. C-reactive protein level, patients’ and physicians’ global VAS, swelling and tenderness of the hand joints, gross grip strength and thumb strength, and disease activity assessments were recorded as non-functional parameters related to active disease status. Reliability was assessed by internal consistency (with Cronbach’s-a) and test–retest intraclass correlation coefficient. Face, content, convergent, and divergent validities were applied.
Results
One hundred and forty-four patients (74.3% female) were included in this study. The Cronbach’s alpha coefficient was 0.963, and for the test–retest reliability of the DHI, the intraclass correlation coefficient was 0.904 (p < 0.001). DHI showed good correlations with the functional disability scales (Hand Functional Index, Health Assessment Questionnaire, VAS-disability), indicating its convergent validity and moderate to non-significant correlations with the non-functional parameters supporting its divergent validity.
Conclusions
Despite the occurrence of significant deformities and functional loss in PsA patients, there is a noticeable absence of specific tools tailored for PsA. Considering the intricacies associated with skin, nail, tendon, entheseal involvement, and arthritis, there is a need for straightforward tools in both clinical practice and studies involving patients with PsA. The DHI is a valid and reliable scale to evaluate the functional disability of hands in patients with PsA.
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Conceptualization: MTD, HHG, SAK, KN, NÖ, EU. Methodology: MTD, NÖ, EU, HHG, KN, SAK. Writing—original draft: SAK, HHG and NÖ. Writing—review and editing: MTD, SAK, Gezer HH, NÖ, EU, KN. All the authors have approved the final manuscript and take full responsibility for the integrity of the contents of the final manuscript.
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All procedures performed in studies involving human participants were performed in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Ethical approval was taken from the Marmara University Ethics Committee (approval no:09.2020.845 and date: 24/07/2022).
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Duruöz, M.T., Nas, K., Kasman, S.A. et al. Validity and reliability of the Duruöz Hand Index in patients with psoriatic arthritis. Rheumatol Int 44, 535–542 (2024). https://doi.org/10.1007/s00296-023-05517-w
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DOI: https://doi.org/10.1007/s00296-023-05517-w