DXI Exam 1 Questions With Correct
Answers.
McGregor's Line and abnormal measurement - answerBasilar invagination if dens is more
than 4.5 mm above line
Chamberlains line and abnormal measurement - answerbasilar invagination if dens is 3 mm
above line
Macraes line normal measurement - answerba...
McGregor's Line and abnormal measurement - answer✔✔Basilar invagination if dens is more
than 4.5 mm above line
Chamberlains line and abnormal measurement - answer✔✔basilar invagination if dens is 3 mm
above line
Macraes line normal measurement - answer✔✔basilar invagination, dens normally 5 mm below
this line
What is Georges line? - answer✔✔curvalinear line following the posterior bodies. tests for
spondylolithesis and ligament integrity
spinolaminar line - answer✔✔the joining of the lamina and spinous process. A line down these
junctions
Sella turcica measurement - answer✔✔16mm width by 12mm tall
What is the upper limit for the ADI for an adult? a child? - answer✔✔3mm
5mm
What is the saggital dimension of the spinal column at c1? C2? C3 and down? -
answer✔✔16mm
14mm
12mm
(any smaller and there can be problems)
Where does the spinal cord terminate? - answer✔✔L1/L2
Os odontoideum - answer✔✔free floating dens above the anterior arch of C2. unfused
(contraindication to adjust)
Klipper - Feil syndrome (clinical triad) - answer✔✔short neck
low posterior hairline
limited range of motion
Os Terminale of Bergmann - answer✔✔Secondary ossification failed to fuse with the rest of the
dens. (usually just the tip) no clinical significance
Agenesis of the posterior arch of C1 - answer✔✔Partial or complete absence of C1 posterior
arch. Can develop a megaspinous in C2 to compensate
occipitalization - answer✔✔Posterior arch of C1 is fused with the skull
Spina bifida occulta - answer✔✔is a malformation of one or more posterior vertebrae arches
At C1 whay is it called when the posterior arch does not form? - answer✔✔Spondyloschisis
Congenital Block Vertebra - answer✔✔The failure of two or more segments to separate during
development. most common at C5/C6, then C2/C3
Sprengels deformity - answer✔✔Abnormally high scapula due to its failure to descend.
what bone is found in 30-40% of sprengels deformity - answer✔✔Omovertebral bone - connects
superior scapula arch with posterior elements with C5 or C6
What is lumbar TVP Spatulization? - answer✔✔When the TVP is 19mm or greater
in a block vertebra what percentage of vertebra also have a posterior arch fusion? -
answer✔✔50% (can adjust, treat as one segment)
epitransverse process - answer✔✔Osseous projection arising superior on the transverse process
extending cephalad towards occiput. May not be well visualized on plain films. CT ideal. One of
the various presentations of occipital vertebrae.
paracondylar process - answer✔✔ventral projection of occipital bone
Third condyle
What is a limbus bone? - answer✔✔unfused bone usually in the anterosuperior aspect of the
vertebra. Usually in the lumbar
What are the contents that would be in the posterior ponticle? - answer✔✔vertebral artery
vertebral vein
C1 nerve root
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