Abstract
BackgroundThe Oxford Shoulder Instability Score (OSIS) is a short, self-reported outcome measurement for patients with shoulder instability.In this study, the OSIS was validated in Dutch by testing the internal consistency, reliability, measurement error, validity and the floor and ceiling effects, and its smallest detectable change (SDC) was calculated.MethodsA total of 138 patients were included. Internal consistency was calculated with Cronbach’s α. Reliability (test-retest) was calculated with the intraclass correlation coefficient (ICC). The measurement error was calculated (SEM), and the SDC was estimated in a subgroup of 99 patients that completed the re-test after a mean of 13 days (5–30 days). Construct validity was evaluated by comparing the OSIS with the Western Ontario Shoulder Instability index (WOSI), the Simple Shoulder Test (SST), the Oxford Shoulder Score (OSS), the Disability of the Arm, Shoulder, and Hand assessment (DASH), and the Short Form-36 (SF-36).ResultsInternal consistency was good, with a Cronbach’s α of 0.88. The reliability was excellent, with an ICC of 0.87. The SEM was 3.3 and the SDC was 9 points (on a scale of 0–48). Regarding the construct validity, 80 % of the results were in accordance with the hypotheses, including a high correlation (0.82) with the WOSI. No floor or ceiling effects were found.ConclusionsThe Dutch version of the OSIS showed good reliability and validity in a cohort of patients with shoulder instability.Electronic supplementary materialThe online version of this article (doi:10.1186/s13018-015-0286-5) contains supplementary material, which is available to authorized users.
Highlights
The Oxford Shoulder Instability Score (OSIS) is a short, self-reported outcome measurement for patients with shoulder instability
All items were agreed to be relevant for this patient population, and taken together, the items represented a comprehensive measurement of shoulder instability
It was subsequently completed by 13 patients with shoulder instability that were asked independently to assess the comprehensibility of all questions
Summary
The Oxford Shoulder Instability Score (OSIS) is a short, self-reported outcome measurement for patients with shoulder instability. A variety of patient-reported outcome measures (PROM) exist, some of which are designed to reflect the patient’s subjective assessment of function. They enable the practitioner to detect functional changes in a standardized format. With a Cronbach’s α of 0.92, a Pearson correlation coefficient of 0.97 and measurement error of 5.7, the OSIS has proven to be valid and reliable, making it clinically important in patients with shoulder instability [8]. The OSIS was proven to be a useful outcome measure in several clinical studies [9,10,11], but van der Linde et al Journal of Orthopaedic Surgery and Research (2015) 10:146 it has not been translated and validated in languages other than English
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