Abstract Background: The anterior cruciate ligament (ACL) is a major knee stabilizing factor during both of the knee’s rotational and anteroposterior stability. ACL damage is a major injury to the knee joint. For identification of ACL injury routinely we practice Anterior drawer test, Lachman’s test and Pivot shift test. In this study we evaluate the accuracy of Lelli’s test for detecting ACL tear and compare it with MRI findings. Methods: This study included 100 patients attending outdoor patient department at Department of orthopedics, Combined Military Hospital (CMH) Bogura from February 2022 to February 2023. aged between 20-60 years with knee symptoms of giving way/locking/pain. Clinical history and detail clinical assessment of knee for instability including Lelli’s test were performed by standard technique and recorded in the Performa. All patients send for MRI of knee and result were compared with Lelli’s test to assess the reliability of clinical test as screening test for ACL injury. Results: In this study total numbers of cases were 100 with mean age was 35 ± 09 years and most of the patients were male 98(98.00%). Maximum injuries occurred on the right side 80 (80.00%). The most common cause of ACL injury was sports activities 85(85.00%) and chief complaints of giving way 82(82.00%). In this study Lelli’s test had sensitivity 94.18 %( CI 70.93-94.57) and Specificity 93.33 %( CI 79.85-97.17) Conclusion: Lelli’s test is a simple with high sensitivity and specificity which can be used as a screening test for evaluation of ACL function in both acute and chronic knee injury.