Date of Award

1-1-2019

Document Type

Masters Thesis

Degree Name

M.S.

Organizational Unit

Daniel Felix Ritchie School of Engineering and Computer Science, Center for Orthopaedic Biomechanics

First Advisor

Chadd Clary, Ph.D.

Second Advisor

Pete Laz

Third Advisor

Andrew Urbaczewski

Keywords

Capsule, Digital Image Correlation, Hip, Laxity, Torque

Abstract

The hip capsule consists of ligament tissue that surrounds the hip joint, providing stability to ensure proper alignment, prevent dislocation, and facilitate proper joint function. The objective of this study was to characterize the torque-rotation response of the natural and posteriorly implanted hip capsule in healthy cadaveric specimens in multiple degrees-of-freedom (DOF) and under combined loading scenarios using the AMTI VIVO, a robotic joint simulator. The anterior portion of the hip capsule was stained with Methylene Blue and virtual extensometers were calculated by Digital Image Correlation (DIC) software for Finite Element Analysis (FEA) model validation. The range of motion (ROM) was evaluated at up to 3 Nm of torque applied in both internal/external rotation and abduction/adduction and varied throughout the range of flexion. The 4-dimensional (combined IE, AD/AB and Flex/Ext resistive torque) total resistive torque rotation space exhibits an 'active zone' whereby the resistive torque attempts to restore it back to the 'neutral zone' where the resistive torque is minimized. Large differences in capsular laxity between natural and implanted specimens were observed, particularly with an increased adduction torque resistance and a reduced internal rotation torque resistance in implanted specimens. Broad variability was observed across specimens highlighting the need for development of patient-specific computational models. These findings assist in characterization of capsular function, informing surgical strategies for hip arthroplasty and long term with a goal of improving patient outcomes.

Publication Statement

Copyright is held by the author. User is responsible for all copyright compliance.

Rights Holder

Luke Storer

Provenance

Received from ProQuest

File Format

application/pdf

Language

en

File Size

134 p.

Discipline

Biology, Mechanical engineering

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