Abstract
Aim: We aimed to translate, cross-cultural adapt and validate the Marx activity rating scale (MARS) of the knee for Romanian patients with anterior cruciate ligament (ACL) injury. Method: The original English form was translated according to guidelines. We included patients with ACL injury undergoing reconstruction in two centers over 3 years. Subjects completed the translated MARS, International Knee Documentation Committee (IKDC) subjective knee form and EuroQol EQ5D. The examining physician completed the Tegner Lysholm scale as an objective evaluation. Re-testing was obtained after one month. We used Spearman`s correlation to evaluate construct validity and reproducibility, Cronbach’s alpha for internal consistency and intraclass correlation for test-retest reliability. Results: We collected valid forms from 99 patients (32.1 ± 8.8 years, 64.6% males) during the preoperative evaluation and 45 were re-tested. Significant, very good correlations were found between the MARS and Tegner Lysholm (Spearman’s r = 0.712, p < 0.0001) and IKDC (Spearman’s r = 0.801, p < 0.0001). Cronbach’s alpha was 0.893 at the initial completion and 0.799 at re-test. The intraclass correlation coefficient was 0.895. Conclusions: The Romanian-translated MARS is a valid, consistent and reliable physical activity outcome measure in patients with anterior cruciate ligament reconstruction.
Highlights
Anterior cruciate ligament (ACL) injury is one of the most frequent pathologies of the knee, especially in the young athletic population
The Marx activity rating scale (MARS) is a validated knee-specific patient-reported outcome measure, which reliably assesses the frequency of participation in sports-related activities for an adult population
Unlike the Tegner scale, the MARS is not based on participation in specific sporting activities as it evaluates different components of physical function that are common in various sports [7,8,9]
Summary
Anterior cruciate ligament (ACL) injury is one of the most frequent pathologies of the knee, especially in the young athletic population. It is the main stabilizer against anterior tibial translation, with functional importance in sports [1,2]. The MARS is a validated knee-specific patient-reported outcome measure, which reliably assesses the frequency of participation in sports-related activities for an adult population. Unlike the Tegner scale, the MARS is not based on participation in specific sporting activities as it evaluates different components of physical function that are common in various sports [7,8,9]
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