A biomechanical study of clamping technique on patellar tendon surface strain and material properties using digital image correlation

Firminger, Colin R.; Edwards, W. Brent

A biomechanical study of clamping technique on patellar tendon surface strain and material properties using digital image correlation

dc.contributor.author	Firminger, Colin R.
dc.contributor.author	Edwards, W. Brent
dc.date.accessioned	2024-05-23T21:22:59Z
dc.date.available	2024-05-23T21:22:59Z
dc.date.issued	2021-01-01
dc.description.abstract	Several clamping techniques exist for ex vivo mechanical testing of tendon. For the patellar tendon, one can choose to clamp directly to the bony attachment sites, the tendon itself, or a combination of the two; however, the influence of these techniques on localized strains and gross material properties is unknown. To this end, uniaxial tensile tests were performed on eleven porcine patellar tendons in three clamping setups while digital image correlation was used to measure axial and transverse strains, Young's modulus, and Poisson's ratio. The setups involved clamping to: 1) the patella and tibia, 2) the patella and the dissected distal tendon, and 3) the dissected proximal and distal tendon. Axial strains in the tendon-tendon clamping setup were 181% higher than patella-tibia clamping (p = 0.002) and 131% higher than patella-tendon clamping (p = 0.006). Transverse strains were not significantly different between clamping conditions (p ≥ 0.118). Young's modulus was 50% (p < 0.001) greater for patella-tibia clamping and 42% (p < 0.001) greater for patella-tendon clamping when compared to tendon-tendon clamping. For all clamping setups, the tendon illustrated auxetic behaviour (i.e., negative Poisson's ratio); however, the Poisson's ratios were 80% smaller in the patella-tibia setup (p = 0.006) and 71% smaller patella-tendon setup (p = 0.007) compared to the tendon-tendon setup. These results illustrate that discretion should be utilized when reporting material properties derived from mechanical tests involving direct clamping to the dissected patellar tendon at both ends, as this clamping technique significantly increases axial strains, reduces Young's modulus, and alters the tendon's natural auxetic behaviour.
dc.description.grantingagency	Natural Sciences and Engineering Research Council (NSERC)
dc.identifier.citation	Firminger, C. R., & Edwards, W. B. (2021). A biomechanical study of clamping technique on patellar tendon surface strain and material properties using digital image correlation. Journal of Mechanical Behavior of Biomedical Materials, 113, 104156. https://doi.org/10.1016/j.jmbbm.2020.104156
dc.identifier.doi	https://doi.org/10.1016/j.jmbbm.2020.104156
dc.identifier.issn	1751-6161
dc.identifier.uri	https://hdl.handle.net/1880/118825
dc.language.iso	en	en
dc.publisher	Elsevier
dc.publisher.faculty	Arts	en
dc.publisher.hasversion	acceptedVersion
dc.publisher.institution	University of Calgary	en
dc.publisher.policy	https://www.elsevier.com/about/policies-and-standards/sharing#3-accepted-manuscript
dc.rights	Attribution-NonCommercial-NoDerivatives 4.0 International	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject	Auxeticity
dc.subject	Biomechanics
dc.subject	Strain concentrations
dc.subject	Young's modulus
dc.title	A biomechanical study of clamping technique on patellar tendon surface strain and material properties using digital image correlation
dc.type	Article
ucalgary.scholar.level	Faculty