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
what is lumbar gravity line
aka Ferguson’s line drawn through the center of L3 vertebral body, should intersect at the sacral base
Kohlers line drawn along
drawn along the pelvic inlet to the outer aspect of the obturator foramen
Kohlers line indicates
acetabular protrusion
bilateral (Paget’s/RA)
Unilateral (Infection/OA)
Shenton’s line drawn from
smooth curvilinear line along inferior femoral neck to superior aspect of obturator foramen
Shenton’s line indicates
dislocation, neck fracture, or SCFE
Iliofemoral Line drawn from
smooth line along outer ilium, across joint and onto femoral neck
Iliofemoral line is important because
bilateral asymmetry indicates SCFE, dislocation, fracture, dysplasia
Femoral Angle is drawn from
two lines drawn through and parallel to the mid axis of the femoral shaft and femoral neck
aka Mikulicz’s angle
Femoral angle normal is
120-130
<120 Coxa Vara
>130 Coxa Valga
Skinners line drawn from
line drawn through and parallel to the femoral shaft. A perpendicular line drawn to the tip of the greater trochanter
skinners line important bc
if fovea capitus falls below indicates fracture, pagets, coxa vara
Klein’s line drawn through
line drawn along outer margin of the femoral neck
Klein’s line important because
fail to intersect indicates SCFE
Boehler’s angle is drawn via
three highest points on the superior aspect of the calcaneus connected with two lines
Boehler’s angle indicates
<28 degrees indicates calcaneal fracture
