Translation, cross-cultural adaptation and validation of the Stanmore System for patients with foot drop due to leprosy in Brazil

Abstract

Introduction From a functional point of view, foot drop causes a major impact on gait, due to loss of dorsiflexion. One of the most widely used scales for the postoperative evaluation of tendon transfer for foot drop is the Stanmore System. This study aimed to carry out the translation, cross-cultural adaptation, and validation of the Stanmore System, for use in Brazil. Methodology The process of translating and adapting the questionnaire followed published guidelines.1–3 The Content Validity Index (CVI) calculation was performed by the analysis of an expert committee, composed of five professionals. Validation was made through the analysis of internal consistency (Cronbach’s alpha), temporal stability (Intraclass Correlation Coefficient – ICC), convergent, and discriminant validity. Results The total CVI of the scale was 0.91. The internal consistency was calculated using Cronbach’s alpha (𝛼 = 0.595) and temporal stability using the Intraclass Correlation Coefficient per item, ranging from 0.89 to 0.99 (p-value < 0.001), and the total of the scale (ICC = 0.98). Convergent (𝜌 = 0.863) and discriminant (𝜌 = −0.263) validity were calculated using Spearman’s Correlation Coefficient in comparison with the results of the AOFAS (American Orthopaedic Foot and Ankle Society) and SALSA (Screening of Activity Limitation and Safety Awareness), respectively. Conclusion The Brazilian version of the Stanmore System is valid and reliable for application in the Brazilian population.