Loading Behaviors Do Not Match Loading Abilities Postanterior Cruciate Ligament Reconstruction

Medicine and Science in Sports and Exercise
Ming-Sheng Chan, Susan M Sigward

Abstract

Strategies that underload the surgical limb after anterior cruciate ligament reconstruction (ACLr) are observed in submaximal tasks. It is not known what underlies these strategies in early rehabilitation. The purpose of this study was to determine if underloading can be attributed to the inability to meet task demands with and without attention to limb loading or learned behavior. Twenty individuals (110.6 [18.1] days) post-ACLr and 20 healthy individuals (CTRL) participated in this study. Participants performed standing, sit-to-stand, and squat tasks under natural, instructed, and feedback conditions. Limb-loading symmetry was calculated as the between-limb ratio of vertical ground reaction force impulse during each task. General Linear Model repeated-measures analysis, 2 (group) × 3 (condition), determined the effects of group and condition on limb-loading symmetry for each task. Significant interactions were observed for each task (all P < 0.001). Compared with CTRL, ACLr exhibited greater asymmetry during natural (deficits: standing, 10%, P = 0.001; sit-to-stand, 25%, P < 0.001; squat, 15%, P < 0.001) and instructed (deficits: sit-to-stand, 13%, P = 0.001; squat, 8%, P = 0.04), but not feedback conditions. The CTRL maintai...Continue Reading

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Citations

Mar 31, 2021·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Elizabeth WellsandtMelissa Manzer
Apr 30, 2021·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Ming-Sheng Chan, Susan M Sigward
Jul 9, 2021·The American Journal of Sports Medicine·Alexander T PeeblesRobin M Queen

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