congenital vertebral anomolies Flashcards
embygensis of vertebral bodies
come from paired somites that migrate during primary neurolation, sacrum and cocyx during secondary neurylation
how many chodification centers centers are there and when does that start
6th week and 3 pairs- one anterior and two posterior-
when does ossification begin
ninth embyonic and ends 14 to 18th week
which anomolies are defects in segmentation
block vertebae, unilateral bas, bar with hemivertebra
what are defects of formation
hemivertibrae, wedge
congential vertebral dislocation
superior getebra elogated posterior elements and large cana,
inferior mishapen with normal posterior elements
what is atlantal hemiring
bony discontinuit of C1 ring with lateral displacement of c1 lateral masses - occip con deformirty
sometimes absence of tranverse ligament- craniovertebral instability
segmental spinal dysgenesis
miltilevel spinal stenosis with hourglass shape of canal- absent pedicles, neurocentral jxn, and tp and involved lvevels
absent nerve roots at levels
medial spinal aplasia
3-11 thoracic and lumbar vertebraw suspended agensis without lumbrosacral agensis- budda like posture
what hemivertibra cause deformity and at what rate
isloated with disc above and below 2 degree a year in thoracic- a fused one cannot groe- incarcerated are ovoid with little growth potential
unilateral bar
potential 5 degress a year
scoliosis progress with which location
thoracolumbar as opposed to upper thoracic lesion
measure cobb angle
angles of most superior and inferior vetebrae
klippel-feil syndrome
segmentation anomalies- fused vertebrae, hemivertebaw, occipitlization of atlase
collegenopathies common anomolies
flat vertebral bodies, hoplatic dens, os odontoidem, atlantoaxial instability-35-60%
