Loading Behaviors Do Not Match Loading Abilities Postanterior Cruciate Ligament Reconstruction
| Autor: | Ming Sheng Chan, Susan M. Sigward |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent Anterior cruciate ligament reconstruction medicine.medical_treatment Physical Therapy Sports Therapy and Rehabilitation Squat medicine.disease_cause Feedback Weight-bearing Weight-Bearing Cruciate ligament Young Adult 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Task Performance and Analysis medicine Humans Orthopedics and Sports Medicine Limb loading Anterior Cruciate Ligament Reconstruction business.industry Anterior Cruciate Ligament Injuries Vertical ground reaction force 030229 sport sciences Middle Aged Biomechanical Phenomena medicine.anatomical_structure Lower Extremity Case-Control Studies Healthy individuals Female business Early rehabilitation |
| Zdroj: | Medicine & Science in Sports & Exercise. 51:1626-1634 |
| ISSN: | 1530-0315 0195-9131 |
| DOI: | 10.1249/mss.0000000000001956 |
| Popis: | PURPOSE 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. METHODS 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. RESULTS 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 maintained symmetry across conditions and tasks. Anterior cruciate ligament reconstruction exhibited greater asymmetry in natural compared with instructed (deficits: standing, 11%, P < 0.001; sit-to-stand, 14%, P < 0.001; squat, 8%, P = 0.001) and feedback (deficits: standing, 10%, P = 0.001; sit-to-stand, 21%, P < 0.001; squat, 15%, P < 0.001) conditions. CONCLUSIONS The presence of loading asymmetries in natural but not feedback conditions indicates that individuals 3 months post-ACLr shift loading away from surgical limb despite the ability to meet task demands which may be suggestive of nonuse behavior. Even when instructed to load symmetrically, individuals continued to exhibit some degree of asymmetry. |
| Databáze: | OpenAIRE |
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