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.
","abstract_html":"<p>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.</p>","abstract_has_math":false,"creators":["Storer, Luke"],"institution":null,"degree_name":"M.S.","degree_level":"Masters Thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Chadd Clary, Ph.D.","Pete Laz","Andrew Urbaczewski"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-01-01T08:00:00Z","date_published":"2019-01-01T08:00:00Z","updated_at":"2026-07-24T02:03:19Z","subjects":["Capsule","Digital Image Correlation","Hip","Laxity","Torque","Biomedical Engineering and Bioengineering","Engineering"],"languages":["en"],"rights":["Copyright is held by the author. User is responsible for all copyright compliance.
"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.du.edu/etd/1624","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Chadd Clary, Ph.D.","Pete Laz","Andrew Urbaczewski"]},{"key":"dc:creator","label":"Author","values":["Storer, Luke"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2019-08-02T07:00:00Z"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Capsule","Digital Image Correlation","Hip","Laxity","Torque","Biomedical Engineering and Bioengineering","Engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is held by the author. User is responsible for all copyright compliance.
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"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Laxity of the Hip Capsule in Natural and Posteriorly Implanted Specimens"]}]}],"canonical_facts":{"dc:contributor":["Chadd Clary, Ph.D.","Pete Laz","Andrew Urbaczewski"],"dc:creator":["Storer, Luke"],"dc:date.available":["2019-08-02T07:00:00Z"],"dc:description.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.
"],"dc:format":["application/pdf"],"dc:identifier":["https://digitalcommons.du.edu/etd/1624"],"dc:language":["en"],"dc:rights":["Copyright is held by the author. User is responsible for all copyright compliance.
"],"dc:subject":["Capsule","Digital Image Correlation","Hip","Laxity","Torque","Biomedical Engineering and Bioengineering","Engineering"],"dc:title":["Laxity of the Hip Capsule in Natural and Posteriorly Implanted Specimens"],"thesis:degree_level":["Masters Thesis"],"thesis:degree_name":["M.S."]},"updated_at":"2026-07-24T02:03:19Z"}