An Analytical Technique for Modeling Knee Joint Stiffness—Part II: Ligamentous Geometric Nonlinearities

[+] Author and Article Information
M. S. Hefzy, E. S. Grood

Giannestras Biomechanics Laboratory, Department of Orthopaedic Surgery, University of Cincinnati Medical Center, Cincinnati, Ohio 45267

J Biomech Eng 105(2), 145-153 (May 01, 1983) (9 pages) doi:10.1115/1.3138398 History: Received April 09, 1982; Revised November 15, 1982; Online June 15, 2009


An analytical technique previously developed to evaluate the contribution of the ligaments to the nonlinear, coupled stiffness characteristics of the human knee joint [1] is extended here to include geometric nonlinearities. In [1], we assumed that the ligaments act as tensile bands running in a straight line between tibial and femoral insertion sites. Here, two forms of geometric nonlinearities are introduced and analyzed: ligaments wrapping around bone surfaces, such as occurs with the medial collateral ligament, the posterior capsule, and the anterior cruciate in hyperextension, and wrapping of ligaments around each other, such as occurs with the cruciate ligaments as the knee is flexed and internally rotated.

Copyright © 1983 by ASME
Topics: Modeling , Stiffness , Knee , Bone
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