Spinal Mechanics

Question 1

What is Fryette’s first principle?

Answer 1

When the thoracic and lumbar spine is in neutral position, the coupled motions of side-bending and rotation for a group of vertebrae are in opposite directions

Question 2

What is Fryette’s second principle?

Answer 2

When the thoracic and lumbar spine is flexed/extended, the coupled motions of side-bending and rotation for a single vertebra occur in the same direction

Question 3

Which way does rotation occur in Fryette’s two principles?

Answer 3

1 - toward the convexity

2 - toward the concavity

Question 4

What spinal segments does Fryette’s 1st principle apply to?

Answer 4

T1-L5 and the OA joint

Question 5

Why is the OA joint considered modified type I mechanics?

Answer 5

You may find a flexion or extension component to it

Question 6

What are the spinal segments for Fryette’s 2nd principle?

Answer 6

C2-L5

Question 7

Who added a 3rd principle that indicates that motions of the vertebral segments are coupled together?

Answer 7

Nelson