Free online Western Ontario Shoulder Instability Index (WOSI) score calculator

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Western Ontario Shoulder Instability Index (WOSI) score calculator

About the score:

Originally published in 1998 in The American Journal of Sports Medicine, the Western Ontario Shoulder Instability Index (WOSI) was designed to be used as the primary outcome measure in clinical trials evaluating treatments for patients with shoulder instability.

The WOSI is a patient completed instrument. Its categories include “physical symptoms” (10 items), “sports, recreation, work” (4 items), “pain” (4 items), “lifestyle” (4 items), and “emotion” (3 items), with each category scored from 0 to 100 using a visual analog scale. Overall scores range from 0 to 2100 with a score of 0 indicating better shoulder function and 2100 indicating worse shoulder function.

Original Literature:

Kirkley, Alexandra, et al. “The development and evaluation of a disease-specific quality of life measurement tool for shoulder instability.” The American Journal of Sports Medicine 26.6 (1998): 764-772.

Validation Literature:

Salomonsson, Björn, et al. “The Western Ontario Shoulder Instability Index (WOSI): validity, reliability, and responsiveness retested with a Swedish translation.” Acta orthopaedica 80.2 (2009): 233-238.

Additional Literature:

Angst, Felix, et al. “Measures of adult shoulder function: Disabilities of the arm, shoulder, and hand questionnaire (DASH) and its short version (QuickDASH), shoulder pain and disability index (SPADI), American shoulder and elbow surgeons (ASES) society standardized shoulder assessment form, constant (Murley) score (CS), simple shoulder test (SST), oxford shoulder score (OSS), shoulder disability questionnaire (SDQ), and Western Ontario shoulder instability index (WOSI).” Arthritis care & research 63.S11 (2011).

About the score developer:

At the time of publication, Ms. Linda Ng was a clinical associate at University Hospital, University of Western Ontario.

To view her publications, please visit PubMed.