TY - JOUR

T1 - Quasi-linear viscoelastic properties of the human medial patello-femoral ligament.

AU - Criscenti, G.

AU - De Maria, C.

AU - Sebastiani, E.

AU - Tei, M.

AU - Tei, Matteo Maria

AU - Placella, G.

AU - Placella, Giacomo

AU - Speziali, A.

AU - Speziali, Andrea

AU - Vozzi, G.

AU - Cerulli, G.

AU - Cerulli, Giuliano Giorgio

PY - 2015

Y1 - 2015

N2 - The evaluation of viscoelastic properties of human medial patello-femoral ligament is fundamental to understand its physiological function and contribution as stabilizer for the selection of the methods of repair and reconstruction and for the development of scaffolds with adequate mechanical properties. In this work, 12 human specimens were tested to evaluate the time- and history-dependent non linear viscoelastic properties of human medial patello-femoral ligament using the quasi-linear viscoelastic (QLV) theory formulated by Fung et al. (1972) and modified by Abramowitch and Woo (2004). The five constant of the QLV theory, used to describe the instantaneous elastic response and the reduced relaxation function on stress relaxation experiments, were successfully evaluated. It was found that the constant A was 1.21±0.96MPa and the dimensionless constant B was 26.03±4.16. The magnitude of viscous response, the constant C, was 0.11±0.02 and the initial and late relaxation time constants τ1 and τ2 were 6.32±1.76s and 903.47±504.73s respectively. The total stress relaxation was 32.7±4.7%. To validate our results, the obtained constants were used to evaluate peak stresses from a cyclic stress relaxation test on three different specimens. The theoretically predicted values fit the experimental ones demonstrating that the QLV theory could be used to evaluate the viscoelastic properties of the human medial patello-femoral ligament.

AB - The evaluation of viscoelastic properties of human medial patello-femoral ligament is fundamental to understand its physiological function and contribution as stabilizer for the selection of the methods of repair and reconstruction and for the development of scaffolds with adequate mechanical properties. In this work, 12 human specimens were tested to evaluate the time- and history-dependent non linear viscoelastic properties of human medial patello-femoral ligament using the quasi-linear viscoelastic (QLV) theory formulated by Fung et al. (1972) and modified by Abramowitch and Woo (2004). The five constant of the QLV theory, used to describe the instantaneous elastic response and the reduced relaxation function on stress relaxation experiments, were successfully evaluated. It was found that the constant A was 1.21±0.96MPa and the dimensionless constant B was 26.03±4.16. The magnitude of viscous response, the constant C, was 0.11±0.02 and the initial and late relaxation time constants τ1 and τ2 were 6.32±1.76s and 903.47±504.73s respectively. The total stress relaxation was 32.7±4.7%. To validate our results, the obtained constants were used to evaluate peak stresses from a cyclic stress relaxation test on three different specimens. The theoretically predicted values fit the experimental ones demonstrating that the QLV theory could be used to evaluate the viscoelastic properties of the human medial patello-femoral ligament.

KW - Ligament biomechanics

KW - Ligament mechanical properties

KW - Medial patello-femoral ligament (MPFL)

KW - QLV theory

KW - Quasi-linear viscoelastic theory

KW - Tissue Engineering

KW - Ligament biomechanics

KW - Ligament mechanical properties

KW - Medial patello-femoral ligament (MPFL)

KW - QLV theory

KW - Quasi-linear viscoelastic theory

KW - Tissue Engineering

UR - http://hdl.handle.net/10807/68997

UR - http://www.jbiomech.com/article/s0021-9290(15)00590-4/fulltext

U2 - 10.1016/j.jbiomech.2015.10.042

DO - 10.1016/j.jbiomech.2015.10.042

M3 - Article

SN - 0021-9290

VL - 48

SP - 4297

EP - 4302

JO - Journal of Biomechanics

JF - Journal of Biomechanics

ER -