Tensile and viscoelastic properties of human patellar tendon

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Johnson, Greg A.¹; Tramaglini, Dawn M.¹; Levine, Rebecca E.¹; Ohno, Kazunori¹; Choi, Nam-Yong¹; Woo, Savio L-Y.¹

Tensile and viscoelastic properties of human patellar tendon

J Orthop Res. 1994;12(6):796-803

Affiliations

¹Musculoskeletal Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, US. A.
Abstract

The tensile and viscoelastic properties of fresh-frozen, nonirradiated human patellar tendon were investigated in two groups of 15 specimens: one group was from individuals 29–50 years old and the other group was from individuals 64–93 years old. The central portion of each patella-patellar tendon-tibia complex was subjected to cyclic preconditioning, stress-relaxation, cyclic stress-relaxation, and load to failure tests. For each age group, stress-relaxation and stress-strain curves were obtained, from which percentage relaxation, ultimate tensile strength, strain at failure, modulus, and strain energy density were determined. Viscoelastic behavior was described with use of quasilinear viscoelasticity. The younger group showed a 46 ± 9% (mean ± SD) decrease in stress after 15 minutes, whereas the older group exhibited a 50 ± 6% decrease. The values for ultimate tensile strength and strain at failure, respectively, were 64.7 ± 15.0 MPa and 14 ± 6% for the younger group and 53.6 ± 10.0 MPa and 15 ± 5% for the older group. Modulus values were 660 ± 266 MPa for the younger group and 504 ± 222 MPa for the older group. Except for ultimate tensile strength, which was 17% less for the older group than for the younger one, no statistically significant differences were found in tensile or viscoelastic properties. This study indicated that there were minimal differences in biomechanical properties of the substance of the patellar tendon between younger and older age groups.
Links

DOI: 10.1002/jor.1100120607

PubMed: 7983555

WoS: A1994PW53900006

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