Advisor Information
Brian Knarr
Presentation Type
Poster
Start Date
1-3-2019 9:00 AM
End Date
1-3-2019 10:15 AM
Abstract
A musculoskeletal simulation study is necessary to identify the cause-effect relationship between hip abductor weakness and ACL loading during athletic events such as landing and jumping. The purpose of this study was to identify the effect of weakness of hip abductors on lower extremity kinematics and ACL loading during single-leg landings. We hypothesized that hip abductor weakness would alter lower extremity joint kinematics. We also hypothesized that hip abductor weakness would increase ACL loading during single-leg landings. This study was a combination of a human experiment and a musculoskeletal modeling simulation. Ten healthy participants performed single-leg landing from a height of 45cm. 3D motion capture and ground reaction force data was used to drive muscle-driven musculoskeletal simulations. No differences between conditions were found in peak ACL loading (pre: 884.15± 124.80, post: 896.40 ± 110.37), knee flexion (pre: 65.54 ± 7.68, post: 66.74 ± 7.21), knee abduction (pre: 5.81 ± 6.18, post: 5.87 ± 5.42), and knee internal rotation angle (pre: 8.98 ± 6.93, post: 8.15 ± 8.04). The mean peak ACL loading (12.52 N/kg) was well aligned with the previous study in low-risk group (13.04 N/kg). This study raises questions of whether the fatigue protocol was demanding enough to see the differences in ACL loading and knee kinematics between the two conditions. Future study will focus on determining what extent weakness of hip abductors alter ACL loading during single-leg landings, and what compensation occurred in other joints during single-leg landings after hip abductor fatigue.
Influence of hip abductor fatigue on ACL loading during single-leg landing
A musculoskeletal simulation study is necessary to identify the cause-effect relationship between hip abductor weakness and ACL loading during athletic events such as landing and jumping. The purpose of this study was to identify the effect of weakness of hip abductors on lower extremity kinematics and ACL loading during single-leg landings. We hypothesized that hip abductor weakness would alter lower extremity joint kinematics. We also hypothesized that hip abductor weakness would increase ACL loading during single-leg landings. This study was a combination of a human experiment and a musculoskeletal modeling simulation. Ten healthy participants performed single-leg landing from a height of 45cm. 3D motion capture and ground reaction force data was used to drive muscle-driven musculoskeletal simulations. No differences between conditions were found in peak ACL loading (pre: 884.15± 124.80, post: 896.40 ± 110.37), knee flexion (pre: 65.54 ± 7.68, post: 66.74 ± 7.21), knee abduction (pre: 5.81 ± 6.18, post: 5.87 ± 5.42), and knee internal rotation angle (pre: 8.98 ± 6.93, post: 8.15 ± 8.04). The mean peak ACL loading (12.52 N/kg) was well aligned with the previous study in low-risk group (13.04 N/kg). This study raises questions of whether the fatigue protocol was demanding enough to see the differences in ACL loading and knee kinematics between the two conditions. Future study will focus on determining what extent weakness of hip abductors alter ACL loading during single-leg landings, and what compensation occurred in other joints during single-leg landings after hip abductor fatigue.