Purpose To translate, cross-culturally adapt and validate the scale to Lithuanian.MethodsThe process of translation and cultural adaptation followed the recommendations of international guidelines. All included patients were after unilateral ACL reconstruction. Study participants completed IKDC, Tegner and ACL-RSI-Lt questionnaires. Reliability, construct validity and internal consistency were measured.ResultsStudy included 65 patients after ACL reconstruction: mean age 25.55 \u00b1 6.77, mean height 180.91 \u00b1 11.78 cm, mean weight 79.12 \u00b1 14.88 kg and mean BMI 24.01 \u00b1 2.90. The ACL-RSI-Lt showed excellent internal consistency (Cronbanch\u2019s alpha 0.94). Scale scores were correlated with IKDC score (r = 0.637, p < 0.001) and IKDC subscales (r = 0.530-0.581, p < 0.001) and Tegner activity score (r = 0.303-0.493, p < 0.001). Tegner activity score before injury was significantly higher than after ACLR (6.95 \u00b1 1.49 vs. 6.1 \u00b1 1.37, p < 0.001). ConclusionsThe ACL-RSI is successfully translated into Lithuanian (ACL-RSI-Lt). It is valid and reliable scale to evaluate the psychological impact of returning to sports in Lithuanian patients after ACLR surgery.