Harris, Michael D.

Henak, Corinne

English

The University of Utah: J. Willard Marriott Digital Library

www.sci.utah.edu SCI INSTITUTE ● EXHIBIT ● EXPLORE ● EXCITE             EXPERIENCE ● EXCHANGE ●  SCISubject-specific Computational Modeling of Normal and Dysplastic HipsMichael Harris, Corinne Henak, Christine Abraham, Benjamin Ellis, Andrew Anderson, Jeffrey WeissPipelineHip Dysplasia Patient-specific hip joint computational modelsSegment CT images Build 3D geometry Create meshes Finite Element Analysis Discrete Element Analysis Analyze Results Acetabular dysplasia may be the leading cause of premature osteoar-thritis (OA) of the hip, a degenerative joint disease.  Hip OA affects ~9% of the US population.While it is thought that mechanical factors are the link between dyspla-sia and OA, clinical studies cannot determine the mechanics of the dys-plastic hip. CT arthrogram captures three-dimensional hip geometry.  Image data are segmented using a combi-nation of automatic and manual methods.Subject-specific 3D reconstruction of bony geometry, overlaid on volu-metric CT data.  Incorporating subject-specific geometry into models produces more accurate predictions of cartilage contact stresses [Anderson et al., 2008 J Biomech Eng].Patient-specific finite element or discrete ele-ment analysis is used to determine contact stresses in the hip joint during simulated ac-tivities of daily living.  These methods improve the understanding of the biomechanics of normal and dysplastic hips.Patient-specific hip joint computational models also have a number of potential longer-term uses and benefits, including patient-specific approaches to treatment and prediction of the long-term success rate of corrective surgeries based on pre- and post-operative mechanics.Discrete Element Analysis (DEA) Method for Predicting Hip Contact StressesContact stress patterns correspond well between DEA and FE models.  00709MPaMPaAnteriorPosteriorDEA9MPaAnteriorFEAPosteriorAnteriorFEAPosteriorW DS AS 0Finite Element (FE) Predictions of Labrum and Cartilage Mechan-ics in Dysplastic Human HipsThe location of contact was centered more laterally in dysplastic sub-jects than in normal subjects during some activities of daily living.Descend Ascend       Walk         WalkHeel                 heel           mid   heelPatient 1    Patient 2    Patient 3    Patient 4      Patient 5    Normal 1   Normal 2   Normal 3   Normal 4  Normal 5Traditional Dysplastic Subjects Normal Subjects0 MPa 8 MPaAnteriorInitial results indicate altered contact mechanics in dysplastic hips when compared to normal hips.  The labrum in dysplastic hips had significantly larger contact areas in all simulated activities, and supported significantly more load in most activities.  Peak pressures in the superolateral region were larger in dysplastic hips for half of the activities and average pressures in the anteromedial region were larger in the normal hips for most activities.

Subject-specific computational modeling of normal and dysplastic hips

https://collections.lib.utah.edu/dl_files/8f/a7/8fa75c1f63a556e7466413ab5ba5b6461282f75a.pdf

Subject-specific computational modeling of normal and dysplastic hips

Abstract

Similar works

Full text

Available Versions

The University of Utah: J. Willard Marriott Digital Library