adj.tech.final Flashcards
What are some of the features of the bony anatomy of the lumbar vertebra?
1) Kidney shaped 2) Wider than deep 3) Increases in size from above down 4) forms a lordotic curve
Are vertebral bodies in the lumbar wide or deeper?
Wider than deep.
What are lumbar vertebra like at birth?
Concave.
When will the lordosis develop?
With walking.
When is the lordosis fully developed? ***
By 8-10 years.
What is the acceptable standard for the degrees of lumbardosis?***
NO acceptable degree (30-35 common range).
What is the typical range of the sacral base angle?
37 - 42, 35-45 degrees
What is the height of an IVD?
about 9 mm in height
What is the ratio between IVD and lumbar vertebral body?
Ratio is 1:3.
What does the increased height of the disc to body do for lumbar flexibility?
It allows for increased lumbar flexibility over thoracic spine
What is the major role of the IVD?***
not to direct movement, but in absorbing and dispersing compressive loads.
What shape are the articular facets of the lumbar vertebrae?
Slightly cupped shaped
What plane do the lumbar articular facets sit in?
Sagittal, with lumbosacral becoming more coronal
Which facet (inferior or superior) is convex and which facet is concave?
Inferior articular facets = convex, Superior articular facets = concave
What are the inferior facets of the lumbar vertebrae like? ***
Inferior facet lies inside the superior facet.
What is the function of the lumbar facets? ***
Resists rotation (less so at L5-S1).
In which facets are facetal tropism most commonly found?
In the lumbosacral facets
What percentage of the axial load do facets normally carry?
18%
What percentage of the axial load do facets carry in hyper extended postures?
Up to 33%
What provides up to 45% of the torsional strength of the lumbar spine?
The facets with their articular capsules
What is the relationship of facetal planes to palpation and adjusting vectors?
Avoidance of jamming or compressive adjusting forces
What is the physical presentation of lumbar vertebrae TP’s?
Small and run obliquely posterolateral
What are used in place of TP’s for adjustive contacts in the lumbars?
Mammillary bodies to avoid uncomfortable pressure on the TPs.
Where are Mammilary bodies found at in relation to the SPs?
Located up one interspinpous and out.