Fryette's Mechanics - Steve Flashcards
What plane and axis are depicted here? Type of movement?
Transverse (Horizontal) Plane
Vertical Axis
Rotation
What plane and axis are depicted here? Type of movement?
Side-bending:
Coronal (Frontal) Plane; Anterior-Posterior Axis
What plane and axis are depicted here? Type of movement?
Flexion/Extension:
Sagittal Plane; Transverse Axis
Define Neutral positioning
- The point of balance of an articular surface from which all the motions physiologic to that articulation may take place2.
- NOTE: Neutral is not a single point, but rather a RANGE in which the weight of the trunk is borne on the vertebral bodies and discs3.
When flexing or extending the spine what joints are being engaged?
facet (zygapophysial) joints
At what level does general spinal motion occur?
Define this thing!
The level of the vertebral unit.
•: Two adjacent vertebrae (vertebral segments) and their associated arthrodial, ligamentous, muscular, vascular, neural and lymphatic elements2.
What are the structural components of the anterior segment of the spinal column? What is their function?
Structure:
- Vertebral Bodies
- Vertebral Discs
- Longitudinal Ligaments*
Function:
•Load Bearing
What are the structural components of the posterior segment of the spinal column? What is their function?
Structure:
- Vertebral Arches
- Facet (Zygapophysial) Joints
- Transverse Processes
- Spinous Processes
- Ligaments*
Function:
•Guide and Limit Motion
How are vertebral units named? How are spinal and vertebral movements described
- Vertebral Units are named for the superior member (vertebrae) of the unit.
- All spinal and vertebral movements are described in relation to the motions of their anterior and superior surfaces.
What is fryette’s first principle?
I.In the NEUTRAL range, side-bending and rotation are coupled in OPPOSITE directions = Type I Mechanics
What is Fryette’s second principle?
I.In sufficient flexion or extension (NON-NEUTRAL), side-bending and rotation are coupled in the SAME direction = Type II Mechanics
What is fryette’s third principle?
III. Initiating movement of a vertebral segment in any plane of motion will modify the movement of that segment in other planes of motion.
All together now! What are Fryette’s Principles? What note should we keep in mind?
I.In the NEUTRAL range, side-bending and rotation are coupled in OPPOSITE directions = Type I Mechanics
II.In sufficient flexion or extension (NON-NEUTRAL), side-bending and rotation are coupled in the SAME direction = Type II Mechanics
III.Initiating movement of a vertebral segment in any plane of motion will modify the movement of that segment in other planes of motion.
NOTE: Fryette’s Principles (I and II) apply only to thoracic and lumbar vertebrae.
What’s this memory tool for?
Fryette’s First Principle
Describe Neutral - Type I mechanics
When the spine is in a neutral position and side-bending is introduced, the bodies of the vertebrae will rotate toward the convexity.
Principle #1 states that in neutral position…
Side-bending and rotation occur in opposite directions.
Principle II of Fryette’s principles states that in non-neutral position (flexed or extended)
Rotation and side-bending are to the same side.
Describe Non-neutral (Type II) Mechanics
When the spine is either forward or backward bent and side-bending is introduced, the vertebrae will rotate toward the concavity
What is this memory tool for?
Fyrette’s 2nd principle
In what plane and around what axis does flexion occur?
•Forward or anterior bending in the sagittal plane around a transverse axis (past the neutral range).
•In Neutral, if T6 side-bends right, which way will it rotate?
–It will rotate left.
•In a flexed (non-neutral) position, if T7 rotates left, which way will it side-bend?
It will side bend left
What is fryettes third principle again? What regions does this principle apply to?
[*] When motion occurs in any one plane within a joint, the motion in all other planes of that joint will be influenced.
Note: Fryette’s third principle applies to cervical, thoracic and lumbar vertebrae.
When complex physiologic Type I or Type II mechanics of a vertebral unit are restricted in any plane of motion, we have?
somatic dysfunction
