lumbar Flashcards
most important charc. of LS is that it can bear huge loads created by ____, interact w/ forces generated by ___ and other actv involving powerful musc actions
body weight
lifting
lumbar spine is largely responsible for ___ mobility
trunk
facets lie primarily in the __ plane, limits rotational flex and allows for greater mobility in flex/ext
sagittal
developmental abnormality where one facet faces ___ and the other faces ___ (L5-S1 most, then L4-5)
sagittally
coronally
developmental abnormality where one facet faces ___ and the other faces ___ (L5-S1 most, then L4-5)
sagittally
coronally
INF articular processes are ____ and AIL, while SUP articular processes are ___ and PSM
convex
concave
the spatial alignment of the __ __ determines, to a large extent, though not completely, the characteristic kinematics of the different regions of the spine
facet joints
facet config limits ___ flexibility and allows for ___ mobility in flex/ext
rotational
greater
L1-L4 facets have ___ orientation and limit __ rotation (theta Y)
L5-S1 facets have ___ orientation and limit post/anterior __
sagittal
axial
coronal
shear
__% of flex/ext occurs in lumbar spine, with 2x more flexion than extension
75
lateral bending in the LS is coupled with ___ rotation, and SP moves to IPSILAT side & VV, though lumbar rotation is quite limited due to sagittal facets
axial
lat bend is ctrl mainly by eccentric activity of ___ which inserts post to the normal axis of motion
-normal muscl actv leads to SP rot twd side of flex
quadratus lumborum
- nucleus of the LS IVD is located ____, and the IVD has a height to body ratio of __
- disc has greater resistance to axial compressive forces
posteriorly
1:3
- lat bend is ctrl mainly by eccentric activity of ___ which inserts post to the normal axis of motion
- normal muscl actv leads to SP rot twd side of flex
quadratus lumborum (is major stabilizer of the LS)
- nucleus of the LS IVD is located ____, and the IVD has a height to body ratio of __
- disc has greater resistance to axial compressive forces
posteriorly
1:3
L SC contains _____ proximally and the ____ distally
conus medularis
cauda equina
while the SC ends at L2, the nerve roots continue down the SC as the __ __, & the CNS is tethered to the coccyx by the ____ ____
cauda equina
filum terminale
___ lig defines ROM, stabilizing dural sac w/i foramen
hoffman
NRs exit dura slightly above the ___ ___, causing their course to be more oblique
foraminal opening
normal lumbar lordosis should be __-__ deg, and the apex of the curve is the ___ disc
20-60 degrees
L3-4
the sacral base angle increases with an ___ pelvic tilt, causing an increased lordosis, more weight bearing on the ___
anterior
facets
the sacral base angle decreases with a ___ pelvic tilt, decreasing lordosis, placing more weight bearing on the ___, therefore decreases spines ability to absorb AXIAL COMPRESSION forces
posterior
disc
ALL/PLL restricts excessive ____ and lubodorsal fascia acts like a large ___ ___
flex/ext
extensor retinaculum
- IS lig controls vertebral ___
- SS provides resistance against excessive fwd ____
- facet capsule restricts jt ___ and distraction of facet surfaces during axial rot
rotation
flexion
flexion
