Affiliations: Laboratory of Biomechanical Design, Division of Mechanical Science, Graduate School of Engineering, Hokkaido University, Kita-ku, N-13, W-8, Sapporo, 060 Japan | Department of Orthopaedic Surgery, School of Medicine Hokkaido University, Japan
Note: [] Address all correspondence to: Shigeru Tadano, Associate Professor, Laboratory of Biomechanical Design, Division of Mechanical Science, Graduate School of Engineering, Hokkaido University, Kita-ku, N-13, W-8, Sapporo, 060 Japan. Tel.: +81 11 706 6405; Fax: +81 11 706 6406; E-mail: [email protected].
Abstract: This paper presents a constitutive law of the lumbar intervertebral disc to be described mathematically with the finite deformation theory. Mechanical behavior of the cadaveric lumbar disc obtained from continuous cyclic compression-tension tests and continuous cyclic axial torsion tests was formulated by the constitutive equation with a semi-circular shaped model. These equations were formulated with or without taking the nucleus pulposus into account. It was also confirmed that forward-backward bending behavior of the disc could be simulated numerically from these equations.
