Modeling the Effects of Femoral Anteversion and Miserable Malalignment on the Hip
Author:
Marianne Voigt ’24Co-Authors:
Nathan A. Chaclas, Mark A. Seeley, Dr. Benjamin WheatleyFaculty Mentor(s):
Dr. Benjamin WheatleyFunding Source:
Kalman Fund for Undergraduate Research in the SciencesAbstract
Introduction: Excessive pathological torsion of the lower limbs can cause gait impairment, joint pain, and in extreme cases is treated with surgery. These torsional profiles can present in conditions such as high, femoral anteversion and miserable malalignment. Motion analysis and musculoskeletal modeling enable the analysis of
human movement to determine joint loads. Thus, the goal of this project was to use musculoskeletal modeling to determine the impact of varying degrees of femoral anteversion and miserable malalignment on the joint loads of the hip.
Materials and Methods: To begin the modeling process, the Rajagopal full body model and freely available experimental data were used as baselines. The Modenese bone deformation tool was then applied through MATLAB and OpenSim to alter the geometry of the baseline model and create one set of models with increased femoral anteversion and one set of models with miserable malalignment. OpenSim Moco –an optimal control
tool- was used to generate kinematics with actuator driven tracking problems and hip joint loads with muscle driven inverse problems. The simulations tracked the force throughout the stance phase of gait, by determining the root mean square (RMS) value of the joint loads.
Results and Discussion: The results of the simulations showed an increase in hip joint loads in both femoral anteversion and miserable malalignment models in the anterior-posterior and superior-inferior plane directions. Hip joint load increases were larger for models with increased femoral anteversion only in comparison to models with miserable malalignment.