{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/49786"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/49786","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Elastic-anisotropic properties of the porcine superflexor tendon measured by instrumented indentation","abstract":"Measurements of soft tissue anisotropy using instrumented indentation are of interest because of the potential for indentation-based clinical diagnostics. Shortage of previous research relating to instrumented indentation of soft tissue in the kPa range, such as tendon, motivated a protocol development phase in our study. Once indents in tendon were repeatedly successful and the protocol validated, elastic-anisotropy in tendon was studied on the premise that collagen fibers in tendon are highly-ordered and unidirectional. Samples of porcine superflexor tendon were mounted for indentation such that the collagen fibers were oriented one of three possible ways relative to the indentation probe: parallel to the probe (longitudinal indentation), perpendicular to the probe (lateral indentation), or 45° to the probe (intermediate indentation). Non-significant differences in the reduced elastic modulus of the three experimental groups suggest that porcine superflexor tendon anisotropy is not detected by instrumented indentation. Contextualizing these results within the concept of indentation strain provides support for the possibility that the critical strain required for the onset of anisotropy in tendon is perhaps beyond the deformation range on the instrumented indentation system. With respect to protocol development for instrumented indentation of soft tissues, new insight is provided into the importance of clearing the indentation probe between successive indents of biological debris to ensure data integrity.","abstract_html":"Measurements of soft tissue anisotropy using instrumented indentation are of interest because of the potential for indentation-based clinical diagnostics. Shortage of previous research relating to instrumented indentation of soft tissue in the kPa range, such as tendon, motivated a protocol development phase in our study. Once indents in tendon were repeatedly successful and the protocol validated, elastic-anisotropy in tendon was studied on the premise that collagen fibers in tendon are highly-ordered and unidirectional. Samples of porcine superflexor tendon were mounted for indentation such that the collagen fibers were oriented one of three possible ways relative to the indentation probe: parallel to the probe (longitudinal indentation), perpendicular to the probe (lateral indentation), or 45° to the probe (intermediate indentation). Non-significant differences in the reduced elastic modulus of the three experimental groups suggest that porcine superflexor tendon anisotropy is not detected by instrumented indentation. Contextualizing these results within the concept of indentation strain provides support for the possibility that the critical strain required for the onset of anisotropy in tendon is perhaps beyond the deformation range on the instrumented indentation system. With respect to protocol development for instrumented indentation of soft tissues, new insight is provided into the importance of clearing the indentation probe between successive indents of biological debris to ensure data integrity.","abstract_has_math":false,"creators":["Sangha, Harpreet"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Wagoner Johnson, Amy J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-05-30T17:17:37Z","date_published":"2014-05-30T17:17:37Z","updated_at":"2026-07-22T22:25:40Z","subjects":["nanoindentation","depth-sensing indentation","soft tissue","biomechanics","tendon anisotropy"],"languages":["en"],"rights":["Copyright 2014 Harpreet Sangha"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/49786","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wagoner Johnson, Amy J."]},{"key":"dc:creator","label":"Author","values":["Sangha, Harpreet"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-05-30T17:17:37Z","2016-09-22T20:59:29Z","2014-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["nanoindentation","depth-sensing indentation","soft tissue","biomechanics","tendon anisotropy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2014 Harpreet Sangha"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/49786"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Measurements of soft tissue anisotropy using instrumented indentation are of interest because of the potential for indentation-based clinical diagnostics. Shortage of previous research relating to instrumented indentation of soft tissue in the kPa range, such as tendon, motivated a protocol development phase in our study. Once indents in tendon were repeatedly successful and the protocol validated, elastic-anisotropy in tendon was studied on the premise that collagen fibers in tendon are highly-ordered and unidirectional. Samples of porcine superflexor tendon were mounted for indentation such that the collagen fibers were oriented one of three possible ways relative to the indentation probe: parallel to the probe (longitudinal indentation), perpendicular to the probe (lateral indentation), or 45° to the probe (intermediate indentation). Non-significant differences in the reduced elastic modulus of the three experimental groups suggest that porcine superflexor tendon anisotropy is not detected by instrumented indentation. Contextualizing these results within the concept of indentation strain provides support for the possibility that the critical strain required for the onset of anisotropy in tendon is perhaps beyond the deformation range on the instrumented indentation system. With respect to protocol development for instrumented indentation of soft tissues, new insight is provided into the importance of clearing the indentation probe between successive indents of biological debris to ensure data integrity.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2014-05-02T21:36:38Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Sangha_Harpreet.docx: 27863797 bytes, checksum: 4445a2d96e082fbfb9b6c74f8283c8be (MD5) Sangha_Harpreet.pdf: 44220406 bytes, checksum: 75aa6a34c778fd6195ef97658d167f81 (MD5)","Made available in DSpace on 2014-05-30T17:17:37Z (GMT). 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Shortage of previous research relating to instrumented indentation of soft tissue in the kPa range, such as tendon, motivated a protocol development phase in our study. Once indents in tendon were repeatedly successful and the protocol validated, elastic-anisotropy in tendon was studied on the premise that collagen fibers in tendon are highly-ordered and unidirectional. Samples of porcine superflexor tendon were mounted for indentation such that the collagen fibers were oriented one of three possible ways relative to the indentation probe: parallel to the probe (longitudinal indentation), perpendicular to the probe (lateral indentation), or 45° to the probe (intermediate indentation). Non-significant differences in the reduced elastic modulus of the three experimental groups suggest that porcine superflexor tendon anisotropy is not detected by instrumented indentation. Contextualizing these results within the concept of indentation strain provides support for the possibility that the critical strain required for the onset of anisotropy in tendon is perhaps beyond the deformation range on the instrumented indentation system. With respect to protocol development for instrumented indentation of soft tissues, new insight is provided into the importance of clearing the indentation probe between successive indents of biological debris to ensure data integrity.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2014-05-02T21:36:38Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Sangha_Harpreet.docx: 27863797 bytes, checksum: 4445a2d96e082fbfb9b6c74f8283c8be (MD5) Sangha_Harpreet.pdf: 44220406 bytes, checksum: 75aa6a34c778fd6195ef97658d167f81 (MD5)","Made available in DSpace on 2014-05-30T17:17:37Z (GMT). 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