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• W3040783145 abstract "Reduced knee function during running has been observed in anterior cruciate ligament reconstructed (ACLR) knees, persisting up to 5 years after surgery. Current evidence is limited to cross-sectional design and often utilizes the contralateral limb for comparison with questionable appropriateness. Pre-injury running biomechanics, although difficult to obtain, can be used to assess post-surgical changes in both the involved and uninvolved limbs. Through preseason injury screening, we obtained running mechanics on collegiate athletes. This study utilizes this pre-injury data for evaluation of bilateral changes in those athletes who sustained an ACL injury and then underwent ACLR. PURPOSE: To assess changes in knee joint mechanics during running from pre-injury to 6-months post-ACLR in Division 1 collegiate athletes. METHODS: Whole body kinematics and ground reaction forces (GRF) were collected during treadmill running for 9 athletes (5 females) prior to a primary ACL injury (PRE) and 6.1±0.3 months post-ACLR (6M). Athletes ran at a maximally comfortable speed at 6M (3.8±0.5m/s) and speed-matched PRE data was reviewed. Knee joint mechanics and GRF variables were compared between PRE and 6M within the involved (INV) and uninvolved (UNI) limb using Wilcoxon Signed-Rank Tests. Results are presented as within-limb percent change (kinetics, GRF) or median difference (kinematics) between PRE and 6M. RESULTS: Knee joint metrics decreased from PRE to 6M in the INV limb: knee flexion excursion during stance (5.4°, p<0.01), knee extensor impulse (59.1%, p<0.01), rate of knee extensor moment (37.0%, p<0.01). No change in knee joint mechanics were observed in the UNI limb (<5%, p>0.1). Furthermore, INV limb demonstrated reduced vertical GRF impulse (2.8%, p<0.01) and braking impulse (13.6%, p=0.01), while both metrics increased in the UNI limb (vertical, 5.7%, p=0.01; braking, 23.8%, p=0.01). CONCLUSIONS: This is the first study to assess changes in running biomechanics following ACLR relative to the pre-injury state. Consistent with cross-sectional studies, INV knee kinematics and kinetics did not return to pre-injury state by 6 months post-ACLR. Additionally, the UNI limb appears to be a valid comparator for the INV limb for knee joint specific running mechanics at 6M, but not for GRF variables. NIH award TL1TR002375" @default.
• W3040783145 created "2020-07-16" @default.
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• W3040783145 date "2020-07-01" @default.
• W3040783145 modified "2023-09-26" @default.
• W3040783145 title "Bilateral Changes In Running Biomechanics Observed From Pre-injury To 6-months Post Anterior Cruciate Ligament Reconstruction" @default.
• W3040783145 doi "https://doi.org/10.1249/01.mss.0000676276.42682.85" @default.
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