Which of the following most accurately describes the primary tissue biomechanics that occur during lumbar rotation in a neutral position?
a. Shear force on the vertebral body; ipsilateral facet compressed
b. Compression on the vertebral body; ipsilateral joint capsule on slack
c. Shear force on the vertebral body; ipsilateral joint capsule stretched
d. Compression on the vertebral body; ipsilateral facet compressed
ANS: C
During rotation of the lumbar spine, a shear force would be applied to the vertebral body as
translation occurs. At the facet surfaces, there would be a compressive force on the side to which
the rotation occurred (ipsilateral side) and a distractive force on the facet capsule on the
contralateral side.
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