Abstract
ObjectivesKnee underloading patterns have been reported mid- and long-term after return to running post-ACLR, but changes in these patterns during the reintroduction to running are unknown. We evaluated knee biomechanics in individuals within 6 months of ACL-R at the start and completion of a reintroduction to running program. DesignLongitudinal laboratory study. SettingThree-dimensional running biomechanics during instrumented treadmill running. Participants24 participants post-ACL-R with hamstring autograft and 24 healthy, matched controls. Main outcome measuresTibiofemoral joint (TFJ) and patellofemoral joint (PFJ) contact forces, peak knee extension moment and peak knee flexion angle. ResultsSignificant LIMB∗GROUP interactions (all p < 0.05) but no TIME effects were found. PFJ and TFJ contact forces, peak knee flexion angle and peak knee extensor moment were lower (all p < 0.001) on the injured-limb compared to both contralateral-limb and CONTROL. PFJ and TFJ contact forces and peak knee flexion, knee extension moment were greater (all p < 0.01) on the contralateral-limb of ACL-R compared to CONTROL. There was no change in knee biomechanics after two weeks of the reintroduction to running. ConclusionsClinicians should be aware that substantial and persistent knee underloading does not resolve upon reintroduction to running after ACL-R. Level of evidenceLongitudinal observational study, level III.
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