Fryette's Type 1 mechanics are characterized by being

Fryette's Type 1 mechanics are characterized by being

• A. Neutral
• B. Non-neutral
• C. Flexed
• D. Extended

Answer: (A)

Fryette Type I mechanics describe motion in a neutral spine, where there is no flexion or extension driving the movement. In this pattern, a group of adjacent vertebrae rotate in opposite directions and side-bend to opposite sides. This neutral, multi-segment pattern is typical in the thoracic and lumbar spine when the dysfunction involves a chain of vertebrae, not a single nonneutral segment. The key point is that the motion occurs without a pure flexion or extension component, with rotation and lateral bending occurring in opposite directions across the involved segments. This contrasts with Type II, which involves a single, nonneutral segment that is flexed or extended, with rotation and side-bending on the same side.

Fryette Type I mechanics describe motion in a neutral spine, where there is no flexion or extension driving the movement. In this pattern, a group of adjacent vertebrae rotate in opposite directions and side-bend to opposite sides. This neutral, multi-segment pattern is typical in the thoracic and lumbar spine when the dysfunction involves a chain of vertebrae, not a single nonneutral segment. The key point is that the motion occurs without a pure flexion or extension component, with rotation and lateral bending occurring in opposite directions across the involved segments. This contrasts with Type II, which involves a single, nonneutral segment that is flexed or extended, with rotation and side-bending on the same side.