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

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研究背景：诺维奇髌骨不稳（Norwich Patellar Instability, NPI）评分是用于评估髌股关节不稳对关节功能影响的工具，此前尚未针对巴西人群完成翻译及文化调适。 研究目的：本研究旨在将NPI评分翻译并进行跨文化调适以适配巴西葡萄牙语使用者，并随后评估其在该人群中的效度。 研究设计与实施场景：本研究为翻译、跨文化调适及效度验证研究，开展于巴西圣保罗州公立公务员协会。 研究方法：本研究招募了60名年龄介于16至40岁、确诊髌骨脱位的男女患者。翻译与文化调适流程为：先将评分翻译为巴西葡萄牙语，再由独立译者将其回译为英文。表面效度由专家委员会及20名患者进行评估。同时效度则通过对剩余40名患者，将巴西葡萄牙语版NPI评分与巴西葡萄牙语版Lysholm膝关节评分、Kujala髌股关节疾病评分进行对比分析。采用Pearson相关系数对三项评分进行相关性分析，显著性水平设为P。