Three dimensions of pain in osteoarthritis: development and validation of the Osteoarthritis Symptom Inventory Scale

We describe here the development and validation of the Osteoarthritis Symptom Inventory Scale (OASIS), a new self-administered questionnaire specifically designed to evaluate the various osteoarthritis (OA) pain symptoms with different dimensions related to OA pain mechanisms. The initial development phase and qualitative study generated a list of 17 descriptors reflecting OA pain and other associated symptoms, leading to the first version of the questionnaire (OASIS17). Each item was quantified on a 0 to 10 Numerical Scale. Validation was performed using 123 consecutive patients with OA pain recruited at 28 centers in France, mainly general practitioner offices. Validation involved (1) determining the questionnaire's factorial structure through exploratory and confirmatory analyses, (2) analyzing convergent and divergent validities (ie, construct validity), (3) assessing each item's test-retest reliability, and (4) evaluating OASIS ability to detect treatment effects (ie, sensitivity to change). The final OASIS version includes 9 items discriminating and quantifying 3 distinct, clinically relevant OA pain dimensions sensitive to treatment. OASIS9 psychometric properties suggest that it could improve the characterization of OA pain profiles for 3 clinically relevant domains: localized, neuropathic-like, and deep pain. The OASIS9 questionnaire could be used to phenotype OA pain patients and identify responders to various therapeutic interventions as a function of OA pain dimensions.

Automated summary

This study describes the development and validation of a new self-administered questionnaire called the Osteoarthritis Symptom Inventory Scale (OASIS), specifically designed to evaluate different dimensions of osteoarthritis (OA) pain symptoms. The validation process involved determining the questionnaire's factorial structure, analyzing its construct validity, testing its reliability, and evaluating its sensitivity to treatment effects. The final version of OASIS includes 9 items that can discriminate and quantify 3 clinically relevant dimensions of OA pain.