THE LOAD SHARING CONTRIBUTION OF SPINAL FACET JOINT DURING IMPACT LOADING – A PORCINE BIOMECHANICAL MODEL
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
Wang, Jaw-Lin
DOI
922320B002103
Abstract
The components that share the loading of motion segment include the
facet joint and disc. Nachemson [1] reported the facet joint share 18%
of vertical loading in a motion segment; while many other researchers
reported the load sharing percentage of facet joint ranges from 1% to
57% [2,3]. The current study developed a unique apparatus using an in
vitro porcine spine model to quantify the alteration of loading in the
facet joint under impact compressive loading at different loading
conditions. A drop tower type impact apparatus was used to produce
the impact energy for the motion segment. A 6-D load cell was placed
under the specimen to detect the force and moment responses. The
pressure sensor was inserted into the facet joint to find the contact
force. The pointed axial compressive forces were applied at 8 locations
from anterior to posterior of upper vertebrae to mimic different impact
loading conditions. The impact energy was fixed at 1.2 J. We found
that; when the loading was applied anteriorly, the facet joint sustained
very small percentages of the loading; while the location of the loading
moved posteriorly, the facet joint sharing percentages increased. The
largest sharing percentages of facet joint reached 30% in the current
study.
Publisher
臺北市：國立臺灣大學醫學工程學研究所
Type
report
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