Presentation Title

Effect of isolated hip abductor fatigue on single-leg landing mechanics and simulated ACL loading

Advisor Information

Brian Knarr

Location

MBSC 201

Presentation Type

Poster

Start Date

6-3-2020 10:45 AM

End Date

6-3-2020 12:00 PM

Abstract

ACL injury often occurs in young and athletic populations during non-contact dynamic movements such as single-leg landings, cutting, or pivoting. The aim of this musculoskeletal simulation study was to determine the effect of hip abductor fatigue on ACL loading, force production of lower extremity, joint angles, and joint moments during single-leg landing. We utilized a cross-sectional design to address the aim of this study. Ten healthy adults participated in this study and experimental biomechanical data were collected before and after fatigue protocols during single-leg landings. Subject-specific musculoskeletal models include 5 degree of freedom (DOF) knee and an ACL to generate single-leg landing simulations using experimental data to estimate ACL loading. There was no significant differences in knee joint angles and ACL loading (pre: 884.15 ± 124.8 N, post: 896.40 ± 110.34) between before and after the fatigue protocols. However, there were significant differences in lateral trunk flexion angle, total excursion of trunk, muscle forces, and joint moments. Changes in these variables may be associated with increased risk of ACL injury during single-leg landings. However, considering small changes and large variations in findings, clinical relevance between hip abductor fatigue and increased risk of ACL injury is questionable. Clinical assessment or screening of the potential ACL injury will benefit from subject-specific musculoskeletal models during dynamic movements. Future study considering the type of the fatigue protocols, cognitive loads, and various tasks is needed to further identify the effect of hip abductor weakness on lower extremity landing biomechanics.

Keywords: ACL, single-leg landing, biomechanics, modeling

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Mar 6th, 10:45 AM Mar 6th, 12:00 PM

Effect of isolated hip abductor fatigue on single-leg landing mechanics and simulated ACL loading

MBSC 201

ACL injury often occurs in young and athletic populations during non-contact dynamic movements such as single-leg landings, cutting, or pivoting. The aim of this musculoskeletal simulation study was to determine the effect of hip abductor fatigue on ACL loading, force production of lower extremity, joint angles, and joint moments during single-leg landing. We utilized a cross-sectional design to address the aim of this study. Ten healthy adults participated in this study and experimental biomechanical data were collected before and after fatigue protocols during single-leg landings. Subject-specific musculoskeletal models include 5 degree of freedom (DOF) knee and an ACL to generate single-leg landing simulations using experimental data to estimate ACL loading. There was no significant differences in knee joint angles and ACL loading (pre: 884.15 ± 124.8 N, post: 896.40 ± 110.34) between before and after the fatigue protocols. However, there were significant differences in lateral trunk flexion angle, total excursion of trunk, muscle forces, and joint moments. Changes in these variables may be associated with increased risk of ACL injury during single-leg landings. However, considering small changes and large variations in findings, clinical relevance between hip abductor fatigue and increased risk of ACL injury is questionable. Clinical assessment or screening of the potential ACL injury will benefit from subject-specific musculoskeletal models during dynamic movements. Future study considering the type of the fatigue protocols, cognitive loads, and various tasks is needed to further identify the effect of hip abductor weakness on lower extremity landing biomechanics.

Keywords: ACL, single-leg landing, biomechanics, modeling