Validation and Cross-Cultural Adaptation of Rating Systems Womac, Kss and Fjs-12 in Patients with Knee Disorders and Injuries
The purpose of the work - is validation and cultural adaptation of the English-language rating systems for knee function assessment for use in scientific, medical and educational institutions of the Russian Federation. Materials and Methods. The English versions of rating systems WOMAC® 3.1 Index, The Knee Society Clinical Rating System©, FJS-12® were translated to Russian language by orthopedic surgeon with advanced level of English and the professional translator specializing in the translation of medical texts. Reverse translation was provided by third independent translator born in the English-speaking country (native speaker). A printed version of the various translations of the questionnaires was filled by patients with an interval of two days. The study group included 150 patients with Stage III knee osteoarthritis (90 women and 60 men aged 48 to 75 years, an average of 62.5 years) hospitalized in Vreden Research Institute of Traumatology and Orthopedics from February to April 2017 for total knee arthroplasty. Results. Good and very good retest reliability of WOMAC (a = 0.87 and a = 0.9), KSS (a = 0.89 and a = 0.86) and FJS-12 (a = 0.94 and a = 0.96) was revealed. The study revealed a strong correlation between the results of the questionnaires performed by different translators: WOMAC (ICC = 0.89), KSS (ICC = 0.86), FJS-12 (ICC = 0.92). The correlation dependence between subsections of WOMAC (stiffness - ICC = 0.98, pain - ICC = 0.87, daily functions - ICC = 0.89) and KSS (knee score - ICC = 0.94, function score - ICC = 0.88), which indicates a good constructive validity. Conclusion. The results of the study of criterial and constructive validity, as well as the retest reliability of the Russian versions of the WOMAC, KSS and FJS-12 scales, indicate that they are a reliable and sensitive tool for assessing the function of knee joint, which can be widely used by Russian researchers in practical and scientific activities.