Thoracic/ lumbar mechanics Flashcards
flex/exten, lat bending and rotation as you go down in thpracic spine
flex/ext/lat bending- increase as you go down
rot- higher at top
Sp direction upper throacic, mid thoracic, upper lumbar, lower lumbar
upper thoracic- convexity
mid- either
upper lumbar- concavity
lower lumbar- convexity
VBS move opposite
where is the axis of rotation for neurtral to ex and flex
ext- top of vert body in sag view
flex- bottom of vert body in sag view
where is the axis of rotation for lat bending in thoracic
right bend- left side of vert body
left bend- right side of vert bodu
where is the axis of rotation in rotation
very middle of vert body
how much more extension do u get with post elements removed in thoracic spine
double extension
flex/ext and lat bending/rot in lumbar spine
flex/ext increases as you move down
lat bending/rot is similar at each lvl
when the spine laterally bends or axially rotates it has the tendencey to go into
slightly flexed posture
axis of rot for flex and ext in lumbar spine
ext- post disk space
flex- ant disk space
axis of rot for lateral bending
right bend- left disk space
left bend- right disk space
how does spondyolysis occur
during bending there is a shear force along pars interarticularis
- during repeted bending the shear forces will cause mucro damage over time eventually leading to pars fracture
what is DDD and DJD due to
increased joint movement/translation
- these movement signals increase bone growth to stabalize joints causing sever DJD
why do we have lumbar lordosis
- nessesary to balance torso over pelvis (reduce extensor moment)
- increases stability
- shock absorber (increases lordosis w walking)
influences of l spine mobility (age, sex, time)
- age (decreases)
- sex- women extend more, men flex more
- time- increased mobility as day goes on
- axial rotation is decreased with stooped posture
