First Law: Neutral Position-Sidebending-Rotation
Fryette called the neutral position "easy-flexion." This refers to the range of motion in the sagittal plane between the points where facet contact occurs in flexion and extension.
When the spinal column makes a sideways bend from the neutral position, the vertebrae rotate into the newly formed convexity (Fig. 3.2). This affects several vertebrae.
Second Law: Flexion(or Extension)-Rotation-Side-bending
When the spinal column makes a sideways bend from a flexion or extension position in which the facets are in contact, the vertebrae are forced to make a rotation to the same side (Fig. 3.3). This is due to the orientation of thejoint plane. This movement can be executed by a group of vertebrae, but also in isolation.
These are physiological movements of the spinal column that we execute on a daily basis:
• In every step, the LSC and TSC make neutral posi-tion-sidebending-rotation (NSR) movements and the CSC makes extension-rotation-sidebending (ERS) movements.
• Every time we bend sideways out of a stoop, at least one vertebra makes a flexion-rotation-sidebending (FRS) movement.
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