Fryette's mechanics Flashcards
rotation is …
motion about a vertical axis in the transverse plane
sidebending is….
motion about an anterior posterior axis in the coronal plane
flexion and extension…
motoin about a transverse plane in the saggital plane
is the neutral position a single point?
no its a range
what happens to the inferior and superior facets in extension?
the inferior facet moves down, superior moves up
the space is closed
what happens to the inferior and superior facets in flexion
the inferior moves up and the superior moves down
the facet is open
what are fryett’es principals
In the neutral range, sidebending and rotation are coupled in OPPOSITE directions
In sufficient flexion or extension, sidebending and rotation are coupled in the SAME direction
Initiating movement of a vertebral segment in any plane of motion will modify the movement of that segment in other planes of motion
to what vertebrae do fryette’s 1st and 2nd principles apply?
the thoracic and lumbar
but the third principal applies to all three c t and l vertebrae
what occurs first in the neutral position
sidebending then rotation
what type of dysfunction occurs in groups?
type I
and this is because it is often compensating for a single type II dysfunction which is usually at the apex or at either end of the gruop curve
what does the N mean for remember the type I dysfunction
a group must act as ONE
if the car is in neutral you must shit (sidebend) before you turn the wheel (rotate)
in type I you get 1 of each direction ( on the N)
what occurs first in a type II dysfunction?
rotation occurs first
then side bending
which dysfunction type tends to occur alone?
type II
what do type II dysfunctions behave like?
behave like a flexible ruler
rotation must occur first before it can sidebend
AND occur in the same direction
also occur in flexion or extension
remember the FE for type II
because there are two letters so flexion or extension and the arrows are pointin in the same direction so rotation and side bending to the same side
type II extension SD
one facet is unable to open completely
When this segment is flexed or returned to neutral, one facet will open, but the other remains closed
This segment returns to symmetry upon extension when both facets are closed
type II flexion SD
One facet gets stuck open
When this segment is extended or returned to neutral, one facet will remain open while the other closes
Because both facets are still able to open, the segment returns to symmetry in flexion
what is arthrodial restriction
thin layer adherence at facet joints
maintained by muscle hypertonicity
what is muscular restriction. what type of dysfunction do the longer paraspinal muscles maintain? and the shorter?
longer paraspinal --> maintain type I -often postural compensation/chronic (erector spinae, splenius, serratous) shorter paraspinal--> maintain type II often acute (transversospinal and intersegmental muscles)
what are the types of SD
arthrodial
muscular restriction
fascial and ligamentous restriction
edema
what does translating mean? and what does it induce?
pushing a segment
so if you push a segment it will induce sidebending in the opposite direction
so if something translates more easily to the right then it prefers left sidebending
when naming type I neutral dysfunction what do you write
sidebending first !
whereas rotation will be first for type II
what is SD named for?
the ease of motion
what does a right transverse process that is more posterior than the left indicate
segment is rotated right
