A mechanistic study for strain rate sensitivity of rabbit patellar tendon |
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| Authors: | John Clemmer Jun Liao Debbie Davis Mark F. Horstemeyer Lakiesha N. Williams |
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| Affiliation: | 1. Department of Agricultural and Biological Engineering, Mississippi State University, Mississippi State, MS 39762, USA;2. Center for Advanced Vehicular System, Mississippi State University, Mississippi State, MS 39759, USA;1. Department of Agricultural and Biological Engineering, Mississippi State University, Mississippi State, MS 39762, USA;2. Center for Advanced Vehicular System, Mississippi State University, Mississippi State, MS 39759, USA;1. Institute of Solid Mechanics, Technische Universität Braunschweig, 38106 Braunschweig, Germany;2. Institute of Mechanical Systems, ETH Zurich, 8092 Zurich, Switzerland;1. Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 South 33rd St, Philadelphia, PA 19104, United States;2. Department of Biomedical Engineering, University of Delaware, 125 East Delaware Avenue, Newark, DE 19716, United States;1. Centre for Sports and Exercise Medicine, Queen Mary, University of London, UK;2. Institute of Sports Medicine, Bispebjerg Hospital, Copenhagen, Denmark;3. Institute for Biomedical Research into Human Movement and Health, School of Healthcare Science, Manchester Metropolitan University, Manchester, UK;1. McKay Orthopaedic Research Laboratory, University of Pennsylvania, 424 Stemmler Hall, 36th and Hamilton Walk, Philadelphia, PA, 19104;2. School of Biomedical Engineering, Science and Health Systems, Drexel University, 3141 Chestnut Street, Philadelphia, PA, 19104 |
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| Abstract: | ![]()
The ultrastructural mechanism for strain rate sensitivity of collagenous tissue has not been well studied at the collagen fibril level. Our objective is to reveal the mechanistic contribution of tendon’s key structural component to strain rate sensitivity. We have investigated the structure of the collagen fibril undergoing tension at different strain rates. Tendon fascicles were pulled and fixed within the linear region (12% local tissue strain) at multiple strain rates. Although samples were pulled to the same percent elongation, the fibrils were noticed to elongate differently, increasing with strain rate. For the 0.1, 10, and 70%/s strain rates, there were 1.84±3.6%, 5.5±1.9%, and 7.03±2.2% elongations (mean±S.D.), respectively. We concluded that the collagen fibrils underwent significantly greater recruitment (fibril strain relative to global tissue strain) at higher strain rates. A better understanding of tendon mechanisms at lower hierarchical levels would help establish a basis for future development of constitutive models and assist in tissue replacement design. |
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