Identification of Viscoelastic Property of Intervertebral Disc Under Flexion, Extension and Lateral Bending

Article type: Research Article

Authors: Tamaki, Tamotsu | Panjabi, Manohar M.

Affiliations: Department of Mechanical Engineering, Nippon Institute of Technology, 4-1 Gakuendai, Miyashiro, Saitama, 345 Japan | Biomechanics Laboratory, Department of Orthopaedics & Rehabilitation, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06510

Abstract: Viscoelastic behavior of the functional spinal unit (FSU) under the application of moment is important for the biomechanical understanding of physiological and pathological aspects of spine. This paper presents a mechanical model on viscoelastic behavior of intervertebral disc connecting two vertebral bodies where a posterior element and surrounding tissues have been removed from FSU. The model, which is composed of a nonlinear spring and a linear Kelvin element in series, is proposed. Specimen of human lumbar intervertebral disc (L3-intervertebral disc-L4) are used for the experiment of the cyclic moment application of flexion, extension and lateral bending with constant loading rates. Simulations by the proposed model are compared with the experiment. It is suggested that the model is good for the prediction of viscoelastic behavior of the intervertebral disc.

Keywords: intervertebral disc, mechanical model, flexion, extension and lateral bending, viscoelasticity

DOI: 10.3233/BME-1991-1401

Journal: Bio-Medical Materials and Engineering, vol. 1, no. 4, pp. 203-214, 1991