The Effect Of Changes In Acetabular Anteversion Angle On Biomechanics Of Hip Articular Cartilage

Objective: This study mainly uses the method of finite element analysis to analyze the biomechanical distribution of the articular contact interface at different acetabular anteversion angles by developing the three-dimensional models of the hip joint,so as to further understanding the influence of acetabular anteversion on the biomechanics of hip articular cartilage and exploring the clinical significance of acetabular anteversion in Femoroacetabular impingement.Methods: Select a healthy adult female volunteer to perform dual-source CT tomography to obtain image data.The data was imported into Mimics medical processing software in Dicom format for three-dimensional models.Three-dimensional models of different angles of acetabular anteversion were constructed using 3-Matic processing software and verified.Secondly,Geomagic design X software imported the STL format to optimize grid and generate three-dimensional geometric models.Then the models were imported into Hypermesh software in Parasolid format to construct different three-dimensional finite element models,defining material properties and boundary conditions and assigning load for different phases.Finally the models were imported into ANSYS system for simulation.The cartilage contact pressures of varied angles of acetabular anteversion were analyzed to evaluate the influence of morphology.Results: Three-dimensional geometric and finite element models of acetabular anteversion with different angles were constructed based on CT image data by using different processing software.During normal gait cycle loading,the joint contact pressure in different acetabular anteversion angles were not significant,while during maximal flexion hip loading,the peaks pressure of different acetabular anteversion angles were obviously significant,distributed at the anterosuperior region of the acetabular rim and femoral head.Conclusion: Based on CT image data and different processing software,the developed three-dimensional finite element hip joint models can accurately depict thereal geometry,which provides a help for studying the biomechanics of hip joint cartilage contact surface.Long-term excessive hip flexion can change the mechanical environment for population with reduced acetabular anteversion.The higher cartilage contact pressure and Von Mises stress may be the main reason causing cartilage degeneration and eventually leading to osteoarthritis.