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Journal of Orthopaedic Surgery and Research
Published in: Journal of Orthopaedic Surgery and Research 1/2015

Open Access 01-12-2015 | Research article

The Oxford Shoulder Instability Score; validation in Dutch and first-time assessment of its smallest detectable change

Authors: Just A. van der Linde, Derk A. van Kampen, Loes W. A. H. van Beers, Derek F. P. van Deurzen, Caroline B. Terwee, W. Jaap Willems

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2015

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Abstract

Background

The 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.

Methods

A 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).

Results

Internal 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.

Conclusions

The Dutch version of the OSIS showed good reliability and validity in a cohort of patients with shoulder instability.
Appendix
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Metadata
Title
The Oxford Shoulder Instability Score; validation in Dutch and first-time assessment of its smallest detectable change
Authors
Just A. van der Linde
Derk A. van Kampen
Loes W. A. H. van Beers
Derek F. P. van Deurzen
Caroline B. Terwee
W. Jaap Willems
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Journal of Orthopaedic Surgery and Research / Issue 1/2015
Electronic ISSN: 1749-799X
DOI
https://doi.org/10.1186/s13018-015-0286-5

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