• Sao Paulo Med J · Jul 2019

    Translation, cross-cultural adaptation and validation of the Norwich Patellar Instability score for use in Brazilian Portuguese.

    • Lucas Simões Arrebola, Túlio Vinícius de Oliveira Campos, Toby Smith, André Lourenço Pereira, and Carlos Eduardo Pinfildi.
    • PT, MSc. Doctoral Student, Department of Human Movement Sciences, Universidade Federal de São Paulo (UNIFESP), Baixada Santista Campus, Santos (SP), and Physical Therapist, Department of Physical Therapy, Instituto de Assistência Médica ao Servidor Público Estadual (IAMSPE), São Paulo (SP), Brazil.
    • Sao Paulo Med J. 2019 Jul 15; 137 (2): 148154148-154.

    BackgroundThe Norwich Patellar Instability (NPI) score is a tool for evaluating the impact of patellofemoral instability on joint function. It has not been translated or culturally adapted for the Brazilian population before.ObjectiveThis study had the aims of translating and culturally adapting the NPI score for use in Brazilian Portuguese and subsequently assessing its validity for this population.Design And SettingTranslation, cross-cultural adaptation and validation study conducted at the State Public Servants' Institute of São Paulo, Brazil.MethodsSixty patients of both sexes (aged 16-40 years) with diagnoses of patellar dislocation were recruited. The translation and cultural adaptation were undertaken through translation into Brazilian Portuguese and back-translation to English by an independent translator. Face validity was assessed by a committee of experts and by 20 patients. Concurrent validity was assessed through comparing the Brazilian Portuguese NPI score with the Brazilian Portuguese versions of the Lysholm knee score and the Kujala patellofemoral disorder score among the other 40 patients. Correlation analysis between the three scores was performed using Pearson correlation coefficients with significance levels of P < 0.05.ResultsThe Brazilian Portuguese version of the NPI score showed moderate correlation with the Brazilian Portuguese versions of the Lysholm score (r = -0.56; 95% confidence interval, CI: -0.74 to -0.30; P < 0.01) and Kujala score (r = -0.57; 95% CI: -0.75 to -0.31; P < 0.01).ConclusionThe Brazilian Portuguese version of the NPI score is a validated tool for assessing patient-reported patellar instability for the Brazilian population.

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