The Effect Of Soft Tissue Properties On
Overall Biomechanical Response Of A
Human Lumbar Motion Segment:
A Preliminary Finite Element Study
Author(s)
H. Cunningham, J. P. Little, M. J. Pearcy & C. J. Adam
Abstract
This study investigates the relative effect of soft tissue properties on the overall
response of a human spinal motion segment using an osseo-ligamentous FE
model of the Visible Man L3-L4 intervertebral joint. Model geometry was
obtained from the Visible Man CT dataset using custom built image processing
software. Non-linear soft tissue properties were obtained from the literature.
Displacement controlled simulations were performed in flexion, extension,
lateral bending and axial rotation. The effect of each soft tissue structure
(including the annular fibres) was assessed by removing it from the model and
comparing the predicted overall stiffness to that of the intact segment. The
results from this study showed that removal of the capsular ligaments and the
collagen fibres in the annulus of the intervertebral disc have the largest effects on
the overall stiffness of the motion segment. All other ligament structures had
little impact on determining the motion response, with the exception of the
anterior longitudinal ligament. Its removal caused the stiffness in extension to
fall to 60 percent of the value reached for the intact model. It is concluded that
correct representation of the mechanical properties of both the capsular ligament
and annular fibres is most important in generating realistic FE models of the
lumbar spine to predict motion segment biomechanics.
Keywords: finite element method, lumbar spine, ligaments, spine biomechanics.
Keywords
finite element method, lumbar spine, ligaments, spine biomechanics.
Related Book
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