Lines of Meauration Flashcards

1
Q

Martins Basilar angle drawn from

A

line drawn from Nasim to center of Sella turcica, the line drawn from basion (anterior foramen magnum) to the center of sella turcica

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2
Q

Why is martins basilar angle important

A

if it is over 152 degrees indicative of platybasia, which could be associated with basilar impression

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3
Q

McGregor’s Line drawn from

A

from hard palate to base of occiput

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4
Q

What does McGregor’s line indicate

A

if odontoid is >8mm in males or >10mm in females indicates basilar impression

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5
Q

What is the most accurate line for basilar impression

A

McGregor’s

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6
Q

Chamberlain’s Line is drawn from

A

drawn from hard palate to the opisthion (posterior foramen magnum)

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7
Q

Chammberlains line can indicate

A

basilar impression if odontoid is >7mm above this line

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8
Q

Macrae’s Line is

A

anterior foramen magnum to posterior foramen magnum

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9
Q

Macraes line indicates

A

basilar impression

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10
Q

what is the Atlantodental interspace

A

C1 anterior tubercle to the odontoid

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11
Q

What does Atlantodental interspace mean

A

if >3mm in adults or >5mm in kids indicates transerverse ligament rupture or instability due to trauma, Down’s syndrome, or inflammatory arthritis

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12
Q

George’s Line is drawn from

A

posterior body margins are checked for a continuous line, not in line indicates A-P malposition

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13
Q

Posterior Cervical line is drawn from

A

lines drawn at the spinolaminar junction, and have a smooth arc like curve. Tells us A-P malposition

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14
Q

Stress Lines of Cervical Spine are drawn

A

drawn at posterior bodies of C2 and C7, Flexion should intersect at C5/C6, Extension should intersect at C4/C5

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15
Q

Retropharyngeal space more than _____ indicates soft tissue mass

A

7mm

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16
Q

Retrolaryngeal space more than ____ indicates soft tissue mass

17
Q

Retrotracheal space more than ______ indicates soft tissue mass

18
Q

Sacral inclination is

A

line drawn parallel and through posterior margin of S1, and a vertical line is drawn intersecting the sacral line
Normal 30-45

19
Q

lumbosacral angle aka

A

sacral base angle aka ferguson’s angle

20
Q

lumbosacral angle drawn from

A

oblique line drawn through and parallel to the sacral base, horizontal line parallel to bottom of film
normal 26-57

21
Q

Ulmann’s line indicates

A

spondylolisthesis

22
Q

Ulmann’s line is drawn from

A

drawn parallel through the sacral base, then perpendicular line drawn on sacral promontory
if L5 goes beyond this line indicates spondy

23
Q

Eisensteins measurement is drawn from the

A

for canal measurement, from the inferior/superior articular processes to the posterior body margin

24
Q

If Sagittal canal measurement is

A

less than 15mm indicates spinal canal stenosis from the Eisenstein’s method of sagittal canal measurement

25
what is lumbar gravity line
aka Ferguson's line drawn through the center of L3 vertebral body, should intersect at the sacral base
26
Kohlers line drawn along
drawn along the pelvic inlet to the outer aspect of the obturator foramen
27
Kohlers line indicates
acetabular protrusion bilateral (Paget's/RA) Unilateral (Infection/OA)
28
Shenton's line drawn from
smooth curvilinear line along inferior femoral neck to superior aspect of obturator foramen
29
Shenton's line indicates
dislocation, neck fracture, or SCFE
30
Iliofemoral Line drawn from
smooth line along outer ilium, across joint and onto femoral neck
31
Iliofemoral line is important because
bilateral asymmetry indicates SCFE, dislocation, fracture, dysplasia
32
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
33
Femoral angle normal is
120-130 <120 Coxa Vara >130 Coxa Valga
34
Skinners line drawn from
line drawn through and parallel to the femoral shaft. A perpendicular line drawn to the tip of the greater trochanter
35
skinners line important bc
if fovea capitus falls below indicates fracture, pagets, coxa vara
36
Klein's line drawn through
line drawn along outer margin of the femoral neck
37
Klein's line important because
fail to intersect indicates SCFE
38
Boehler's angle is drawn via
three highest points on the superior aspect of the calcaneus connected with two lines
39
Boehler's angle indicates
<28 degrees indicates calcaneal fracture