A Method for the Identification of In-Vivo Segmental Stiffness Properties of the Spine

[+] Author and Article Information
R. Vanderby

Biomechanics Laboratory, Division of Orthopedic Surgery, University of Wisconsin, Madison, Wisc. 53792

M. Daniele, A. Patwardhan

Biomechanics Laboratory, Rehabilitation Research and Development Center, Hines VA Hospital, Hines, Ill. 60141

W. Bunch

The University of Chicago, Chicago, Ill. 60637

J Biomech Eng 108(4), 312-316 (Nov 01, 1986) (5 pages) doi:10.1115/1.3138620 History: Received August 19, 1983; Revised June 12, 1986; Online June 12, 2009


A numerical algorithm is used to estimate in-vivo segmental stiffness properties of individual spine segments based upon existing load-displacement data. A static nonlinear finite element model stimulates a pathological spine and corrective instrumentation system. A systematic procedure for establishing the model’s stiffness parameters is described, in the form of a nonlinear constrained optimal design problem. The numerical method is demonstrated using as an example a case of adolescent idiopathic scoliosis requiring corrective surgery.

Copyright © 1986 by ASME
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