Non-arthritic Hip Score: translation, cultural adaptation and validation of the Italian version

BACKGROUNDː the aim of the study was to translate the Nonarthritic Hip Score (NAHS)questionnaire into the Italian language, to adapt it into the Italian culture and to validate it.METHODSː Translation and cultural adaptation were performed following internationalguidelines. To assess the reliability of the tool internal consistency and test-retest reliabilitywere evaluated through Cronbach’s alpha and Intraclass Correlation Coefficient (ICC)respectively. Validity was evaluated by Pearson’s correlation coefficient between the NAHS,the Lequesne Index of Severity for Osteoarthritis of the Hip (LISOH) and the WesternOntario and McMaster Universities Arthritis Index (WOMAC), that were administeredtogether. These three questionnaires were applied to a population of 64 individuals between19 and 82 years old with generic hip injures or diseases.RESULTSː The items of the original version of NAHS are similar or equal to the items ofthe Italian version of NAHS. Cronbach’s α was 0.614 (Pain); 0.821 (Symptom); 0.877(Function); 0.896 (Activity). ICC for total score was 0.905. The correlation with theWOMAC was 0.850 (p< 0.01) and with the LISOH was 0.738 (p<0.01).CONCLUSIONSː The NAHS showed positive results for reliability and validity so it wastranslated into Italian language and was cross-culturally adapted to Italian culture. Thisquestionnaire is a good instrument in clinical practice and scientific research for theevaluation of young and active individuals affected by hip injures or diseases.