Lines of Meauration Flashcards
Martins Basilar angle drawn from
line drawn from Nasim to center of Sella turcica, the line drawn from basion (anterior foramen magnum) to the center of sella turcica
Why is martins basilar angle important
if it is over 152 degrees indicative of platybasia, which could be associated with basilar impression
McGregor’s Line drawn from
from hard palate to base of occiput
What does McGregor’s line indicate
if odontoid is >8mm in males or >10mm in females indicates basilar impression
What is the most accurate line for basilar impression
McGregor’s
Chamberlain’s Line is drawn from
drawn from hard palate to the opisthion (posterior foramen magnum)
Chammberlains line can indicate
basilar impression if odontoid is >7mm above this line
Macrae’s Line is
anterior foramen magnum to posterior foramen magnum
Macraes line indicates
basilar impression
what is the Atlantodental interspace
C1 anterior tubercle to the odontoid
What does Atlantodental interspace mean
if >3mm in adults or >5mm in kids indicates transerverse ligament rupture or instability due to trauma, Down’s syndrome, or inflammatory arthritis
George’s Line is drawn from
posterior body margins are checked for a continuous line, not in line indicates A-P malposition
Posterior Cervical line is drawn from
lines drawn at the spinolaminar junction, and have a smooth arc like curve. Tells us A-P malposition
Stress Lines of Cervical Spine are drawn
drawn at posterior bodies of C2 and C7, Flexion should intersect at C5/C6, Extension should intersect at C4/C5
Retropharyngeal space more than _____ indicates soft tissue mass
7mm
Retrolaryngeal space more than ____ indicates soft tissue mass
14mm
Retrotracheal space more than ______ indicates soft tissue mass
22mm
Sacral inclination is
line drawn parallel and through posterior margin of S1, and a vertical line is drawn intersecting the sacral line
Normal 30-45
lumbosacral angle aka
sacral base angle aka ferguson’s angle
lumbosacral angle drawn from
oblique line drawn through and parallel to the sacral base, horizontal line parallel to bottom of film
normal 26-57
Ulmann’s line indicates
spondylolisthesis
Ulmann’s line is drawn from
drawn parallel through the sacral base, then perpendicular line drawn on sacral promontory
if L5 goes beyond this line indicates spondy
Eisensteins measurement is drawn from the
for canal measurement, from the inferior/superior articular processes to the posterior body margin
If Sagittal canal measurement is
less than 15mm indicates spinal canal stenosis from the Eisenstein’s method of sagittal canal measurement