The ACL-RSI Kr may distinguish patients who had returned to sports activities to a certain stage in contrast with the previous status from those that didn’t. This examine demonstrated the great psychometric properties of the ACL-RSI Kr. High reliability (good internal consistency and good test-retest reliability) was noticed. In phrases of validity, it showed good assemble validity and good content validity . Furthermore, it had good discriminant validity, which suggests the ACL-RSI Kr can be effective in distinguishing the sufferers who returned to sports activities from those who didn’t. The main function of this research was to translate the ACL-RSI in Korean to evaluate the affected person’s psychological readiness to return to sports after ACL reconstruction in Korean sufferers.