DXI exam 1 All Possible Questions and Answers with complete solution
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Course
DXI
Institution
DXI
Congenital Block Vertebra - The failure of two or more segments to separate during development.
most common at C5/C6, then C2/C3
Agenesis of the posterior arch of C1 - Partial or complete absence of C1 posterior arch. Can
develop a megaspinous in C2 to compensate
What is the saggital dimension ...
DXI exam 1
Congenital Block Vertebra - The failure of two or more segments to separate during development.
most common at C5/C6, then C2/C3
Agenesis of the posterior arch of C1 - Partial or complete absence of C1 posterior arch. Can
develop a megaspinous in C2 to compensate
What is the saggital dimension of the spinal column at c1? C2? C3 and down? - 16mm
14mm
12mm
(any smaller and there can be problems)
McGregor's Line and abnormal measurement - Basilar invagination if dens is more than 4.5 mm
above line
Chamberlains line and abnormal measurement - basilar invagination if dens is 3 mm above line
Macraes line normal measurement - basilar invagination, dens normally 5 mm below this line
What is Georges line? - curvalinear line following the posterior bodies. tests for spondylolithesis
and ligament integrity
spinolaminar line - the joining of the lamina and spinous process. A line down these junctions
Sella turcica measurement - 16mm width by 12mm tall
What is the upper limit for the ADI for an adult? a child? - 3mm
5mm
, Where does the spinal cord terminate? - L1/L2
Os odontoideum - free floating dens above the anterior arch of C2. unfused
(contraindication to adjust)
Klipper - Feil syndrome (clinical triad) - short neck
low posterior hairline
limited range of motion
Os Terminale of Bergmann - Secondary ossification failed to fuse with the rest of the dens.
(usually just the tip) no clinical significance
occipitalization - Posterior arch of C1 is fused with the skull
Spina bifida occulta - is a malformation of one or more posterior vertebrae arches
At C1 whay is it called when the posterior arch does not form? - Spondyloschisis
Sprengels deformity - Abnormally high scapula due to its failure to descend.
what bone is found in 30-40% of sprengels deformity - Omovertebral bone - connects superior
scapula arch with posterior elements with C5 or C6
What is lumbar TVP Spatulization? - When the TVP is 19mm or greater
in a block vertebra what percentage of vertebra also have a posterior arch fusion? - 50% (can
adjust, treat as one segment)
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