Ziegler CG, DePhillipo NN, Kennedy MI, et al. - This study was undertaken to investigate the patient history, physical examination findings, magnetic resonance imaging (MRI), and 3-dimensional computed tomographic (3D CT) measurements of those with anterior cruciate ligament (ACL) graft failure in comparison with primary ACL tear patients to better discern risk factors for ACL graft failure. Researchers conducted a retrospective review comparing patients who had undergone revision ACL reconstruction (ACLR) with a primary ACLR group with a minimum 1-year follow-up. This research included a sum of 109 primary ACLR patients, mean age 33.7 years (range 15 to 71), enrolled between July 2016 and July 2018, and 90 revision ACLR patients, mean age 32.9 years (range 16 to 65). The results of this study demonstrate that Beighton score, quadriceps circumference side-to-side difference, family history of an ACL tear, lateral posterior tibial slope, anterolateral tibial subluxation, and anteromedial tibia subluxation were all significantly different between primary and revision ACLR groups. A high rate of tunnel malposition was observed in the revision ACLR group.