Prediction of Antagonistic Muscle Forces Using Inverse Dynamic Optimization During Flexion/Extension of the Knee

[+] Author and Article Information
G. Li

Orthopædic Biomechanics Laboratory, Massachusetts General Hospital and Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215

K. R. Kaufman

Orthopædic Biomechanics Laboratory, Mayo Clinic and Mayo Foundation, Rochester, MN 55905

E. Y. S. Chao

Orthopædic Biomechanics Laboratory, The Johns Hopkins University, Baltimore, MD 22222

H. E. Rubash

Orthopædic Biomechanics Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02215

J Biomech Eng 121(3), 316-322 (Jun 01, 1999) (7 pages) doi:10.1115/1.2798327 History: Received July 01, 1998; Revised December 09, 1998; Online October 30, 2007


This paper examined the feasibility of using different optimization criteria in inverse dynamic optimization to predict antagonistic muscle forces and joint reaction forces during isokinetic flexion/extension and isometric extension exercises of the knee. Both quadriceps and hamstrings muscle groups were included in this study. The knee joint motion included flexion/extension, varus/valgus, and internal/external rotations. Four linear, nonlinear, and physiological optimization criteria were utilized in the optimization procedure. All optimization criteria adopted in this paper were shown to be able to predict antagonistic muscle contraction during flexion and extension of the knee. The predicted muscle forces were compared in temporal patterns with EMG activities (averaged data measured from five subjects). Joint reaction forces were predicted to be similar using all optimization criteria. In comparison with previous studies, these results suggested that the kinematic information involved in the inverse dynamic optimization plays an important role in prediction of the recruitment of antagonistic muscles rather than the selection of a particular optimization criterion. Therefore, it might be concluded that a properly formulated inverse dynamic optimization procedure should describe the knee joint rotation in three orthogonal planes.

Copyright © 1999 by The American Society of Mechanical Engineers
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