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. 2019 Jul 15;137(2):148-154.
doi: 10.1590/1516-3180.2018.0393280119.

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

Lucas Simões Arrebola  1 , Túlio Vinícius de Oliveira Campos  2 , Toby Smith  3 , André Lourenço Pereira  4 , Carlos Eduardo Pinfildi  5
Affiliations

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

Lucas Simões Arrebola et al. Sao Paulo Med J. .

Abstract

Background: The 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.

Objective: This 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 setting: Translation, cross-cultural adaptation and validation study conducted at the State Public Servants' Institute of São Paulo, Brazil.

Methods: Sixty 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.

Results: The 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).

Conclusion: The 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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Conflict of interest statement

Conflict of interest: The authors declare that they did not have any potential conflicts of interest with regard to the research, authorship orpublication of this manuscript

Figures

Figure 1.
Figure 1.. Translated and validated Brazilian Portuguese version of the Norwich Patellar Instability score.
Figure 2.
Figure 2.. Score sheet of the Norwich Patellar Instability score translated into Brazilian Portuguese.
See this image and copyright information in PMC

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