Acta Medica Port
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The Western Ontario Shoulder Instability Index (WOSI) is a self-administered questionnaire specifically used to determine the impact of shoulder instability on quality of life. The aim of this study was to translate the WOSI into European Portuguese and analyze its validity and reliability in a population with shoulder instability. ⋯ WOSI-PT is a reliable and valid instrument for assessing the functional impact of shoulder joint instability on quality of life.