PMID: 9429999Jan 16, 1998Paper

Tensile properties of human tendo Achillis: effect of donor age and strain rate

The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons
G Lewis, K M Shaw

Abstract

Two sets of tensile tests were conducted on tendo Achillis taken from 16 embalmed cadavers (donor ages, 36 to 100 years). From the stress, sigma-versus-strain, epsilon results, values of the following properties were obtained: linear stiffness, ST (which is defined as the slope of the linear zone of the post-toe region of the load-versus-extension plot), ultimate tensile strength [UTS], the strain at the UTS point (herein called the ultimate tensile strain) [epsilon max], and the tangent modulus of elasticity, [ET] (which is the slope of the linear zone of the post-toe region of the sigma-epsilon curve). In the first set of tests, the loading rate was 10%/sec. The results are thus: linear stiffness: 685 +/- 262 N/mm.; UTS = 59 +/- 18 MPa; epsilon max = 22 +/- 7%; and ET = 375 +/- 102 MPa. It was found that donor age exerts an insignificant effect on linear stiffness, a marked effect on UTS, an insignificant effect on epsilon max, and a moderate effect on ET (Student's t-test; p < 0.05). In the second set of tests, the test tendons were taken from the cadavers of "middle-aged" donors (52 to 67 years), and the strain rate was 100%/sec. By combining the results of the first and second sets of tests for a subset of this group (i.e....Continue Reading

Citations

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