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Abstract
The purpose of this study was to test face and content validity, feasibility and internal consistency and test retest reliability of Arabic-language version of knee injury and osteoarthritis outcome score physical function short form (KOOS-PS) to measure the physical function (PF) level in knee osteoarthritic patients. Subjects and methods: Three expert panels (each consists of ten experts) and 69 patients with knee OA participated in this study, 150 sheets (including retest sheets) were filled out in this study considering that bilateral knee osteoarthritic patient filled out 2 sheets. Forward translation, development of preliminary initially translated version, backward translation, development of the pre-final version and testing of pre-final version using experts then testing of the final version on patients was done. Clarity index, expert proportion of clearance, index of content validity, expert proportion of relevance, descriptive statistics, missed item index, time taken to answer the scale, Cronbach{u2019}s coefficient alpha and Spearman{u2019}s rank correlation coefficients were used for statistical analysis. Results : The study showed that scale index of clarity equals 100%, scale-level clarity index universal agreement (UA) equals 100% and the mean of proportion of clearance (clear responses) equals 100%. In addition, scale index of content validity (S-CVI) equals 97.14%, S-CVI/UA equals 71% and the mean of the proportion of relevance (relevant responses) equals 97.14%. The scale items were filled by 99.4% in all sheets and it needed three minutes or less to be answered in about 75% of all sheets, Cronbach’s alpha equals 0.848 (0.789, 0.896) and all Spearman{u2019}s rank correlation coefficients between test and retest results were statistically significant. Conclusion: Arabic-language version of the knee injury and osteoarthritis outcome score physical function short form has face and content validity, feasibility and internal consistency and test retest reliability enough to measure the physical function in knee osteoarthritic patients