Gait Biomechanics in ACL Reconstructed Knees at Different Time Frames Post-surgery

Purpose To examine knee and hip biomechanics during walking and jogging in groups of ACLR patients at early, mid, and late time frames post-surgery and healthy controls. Methods Participants included individuals with a history of primary, unilateral ACLR, stratified into Early (1.4±0.4 years post, n=18), Mid (3.3±0.6 years post, n=20), and Late (8.5±2.8 years post, n=20) ACLR groups based on time post-surgery, and a healthy control group (n=20). Walking and jogging motion capture analysis of knee and hip kinetics and kinematics were measured in the sagittal and frontal planes. Inter-limb (within groups) and between-group comparisons were performed for all gait variables. Statistical comparisons were made across the gait cycle by plotting graphs of means and 90% confidence intervals and identifying regions of the gait cycle in which the 90% confidence intervals did not overlap. Results Early ACLR group demonstrated reduced knee flexion, knee extension, knee adduction, and hip adduction moments on the ACLR limb. Mid ACLR group demonstrated no gait differences between limbs or other groups. Late ACLR group demonstrated reduced knee flexion moments, and greater knee and hip adduction moments in their ACLR limb. Control group demonstrated no inter-limb differences. Conclusions Walking and jogging gait biomechanics presented differently in patients at different stages in time following ACLR surgery. The Early ACLR group demonstrated lower sagittal and frontal plane joint loading on the ACLR limb compared to contralateral and control limbs. The Mid ACLR group did not demonstrate any gait differences compared to the contralateral or control limb. The Late ACLR group demonstrated lower sagittal plane joint loading compared to control limbs and greater frontal plane joint loading compared to contralateral and control limbs. Corresponding Author: Dr. John Goetschius, 110. S. Madison Street, Adrian, MI 49221, (e) jgoetschius@adrian.edu, (p) 517-265-5161 ext. 4017 This research was supported by an internal IDEA Grant from the Curry School of Education at the University of Virginia. The authors have no relationships with companies or manufacturers who will benefit from the results of the present study. The results of the present study do not constitute endorsement by ACSM. The results of this study are presented clearly, honestly, and without fabrication, or inappropriate data manipulation. Accepted for Publication: 11 June 2018 © 2018 American College of Sports Medicine

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