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We developed the ACL specialized post\u2010operative return\u2010to\u2010sports (ACL\u2010SPORTS) randomized control trial to test the effect of strength, agility, plyometric, and secondary prevention (SAPP) training with and without perturbation training (SAPP\u2009+\u2009PERT) on gait mechanics in women after ACLR. We hypothesized that movement symmetry would improve over time across both groups but more so among the SAPP\u2009+\u2009PERT group. Thirty\u2010nine female athletes 3\u20139 months after primary ACLR were randomized to SAPP or SAPP\u2009+\u2009PERT training. Biomechanical testing during overground walking occurred before (Pre\u2010training) and after (Post\u2010training) training and one and 2 years post\u2010operatively. Hip and knee kinematic and kinetic variables were compared using repeated measures analysis of variance with Bonferroni corrections for post hoc comparisons (\u03b1\u2009=\u20090.05). There was a time by limb interaction effect (<jats:italic>p<\/jats:italic>\u2009=\u20090.028) for peak knee flexion angle (PKFA), the primary outcome which powered the study, characterized by smaller PKFA in the involved compared to uninvolved limbs across treatment groups at Pre\u2010training, Post\u2010training, and 1 year, but not 2 years. Similar findings occurred across sagittal plane knee excursions and kinetics and hip extension excursion at midstance. There were no meaningful interactions involving group. Neither SAPP nor SAPP\u2009+\u2009PERT training improved walking mechanics, which persisted 1 but not 2 years after ACLR. Statement of clinical significance: Asymmetrical movement patterns persisted long after participants achieved symmetrical strength and functional performance, suggesting more time is needed to recover fully after ACLR. \u00a9 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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