Fryettes Laws

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.

Post Lumbar Positioning
Fig. 3.2 Behavior of the lumbar vertebrae during side-bending from the neutral position (NSR). Adaptive lumbar curvature.
Fryette Laws
Fig. 3.3 Facet position in flexion and extension.
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