Validation of the Brazilian Portuguese Version of the Western Ontario Shoulder Instability Index (WOSI) Questionnaire.

All instruments analyzed showed a significant relationship among themselves but at different levels: the correlation between the WOSI and DASH instruments was perfectly positive ( r = 0.96); the comparison of the WOSI and UCLA ( r = 0.87), DASH and UCLA ( r = 0.86), SSV and Rowe ( r = 0.80), VAS and DASH (r = 0.75), VAS and UCLA ( r = 0.74), and WOSI and VAS ( r = 0.72) also showed a trend towards positive linearity among measurements; and the comparison of the instruments WOSI and SSV, WOSI and Rowe, DASH and Rowe, SSV and UCLA ( r = -0.83), SSV and DASH ( r = -0.79), Rowe and UCLA ( r = -0.78), VAS and SSV ( r = -0.68), and VAS and Rowe ( r = -0.60) revealed a negative correlation.

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