Abstract
Objective: The Marx Activity Rating Scale (MARS) is a recently developed in English to assess patients’ who have knee problems activity level. However, there is no Turkish validation for it. Materials and Methods: MARS was translated into Turkish language according to the recommended stages by Beaton et al. 100 Patients (mean age, 30.90 ± 10.46) with various types of the knee problems were included. Each participant completed the MARS twice at fourteen day intervals to determine the test-retest reliability using the interrater correlation coefficient and Cronbach's alpha evaluating internal-consistency. Spearman's correlation coefficient was done to measure construct validity between the MARS, the EUROQoL (EQ-5D), the International Knee Documentation Committee (IKDC) Scale. Results: A total of 100 patients (37 females, 63 males) completed the Turkish-language MARS. The reliability of the test-retest was 0.905, with Cronbach's alpha of 0.828 at the initial and 0.782 for the retest. High correlations were found between the IKDC and MARS (r =0.253). MARS also strongly correlated with the EQ5D-VAS component score (r =0.265). Floor or ceiling effects were not found for the overall MARS score. Conclusion: MARS is a valid, reliable and might be preferred for patients with numerous knee problems. Keywords: Validity, Reliability, Knee, Activity.
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