Lines of Meauration

Question 1

Martins Basilar angle drawn from

Answer 1

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

Question 2

Why is martins basilar angle important

Answer 2

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

Question 3

McGregor’s Line drawn from

Answer 3

from hard palate to base of occiput

Question 4

What does McGregor’s line indicate

Answer 4

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

Question 5

What is the most accurate line for basilar impression

Answer 5

McGregor’s

Question 6

Chamberlain’s Line is drawn from

Answer 6

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

Question 7

Chammberlains line can indicate

Answer 7

basilar impression if odontoid is >7mm above this line

Question 8

Macrae’s Line is

Answer 8

anterior foramen magnum to posterior foramen magnum

Question 9

Macraes line indicates

Answer 9

basilar impression

Question 10

what is the Atlantodental interspace

Answer 10

C1 anterior tubercle to the odontoid

Question 11

What does Atlantodental interspace mean

Answer 11

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

Question 12

George’s Line is drawn from

Answer 12

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

Question 13

Posterior Cervical line is drawn from

Answer 13

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

Question 14

Stress Lines of Cervical Spine are drawn

Answer 14

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

Question 15

Retropharyngeal space more than _____ indicates soft tissue mass

Answer 15

7mm

Question 16

Retrolaryngeal space more than ____ indicates soft tissue mass

Answer 16

14mm

Question 17

Retrotracheal space more than ______ indicates soft tissue mass

Answer 17

22mm

Question 18

Sacral inclination is

Answer 18

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

Question 19

lumbosacral angle aka

Answer 19

sacral base angle aka ferguson’s angle

Question 20

lumbosacral angle drawn from

Answer 20

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

Question 21

Ulmann’s line indicates

Answer 21

spondylolisthesis

Question 22

Ulmann’s line is drawn from

Answer 22

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

Question 23

Eisensteins measurement is drawn from the

Answer 23

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

Question 24

If Sagittal canal measurement is

Answer 24

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

Question 25

what is lumbar gravity line

Answer 25

aka Ferguson’s line drawn through the center of L3 vertebral body, should intersect at the sacral base

Question 26

Kohlers line drawn along

Answer 26

drawn along the pelvic inlet to the outer aspect of the obturator foramen

Question 27

Kohlers line indicates

Answer 27

acetabular protrusion
bilateral (Paget’s/RA)
Unilateral (Infection/OA)

Question 28

Shenton’s line drawn from

Answer 28

smooth curvilinear line along inferior femoral neck to superior aspect of obturator foramen

Question 29

Shenton’s line indicates

Answer 29

dislocation, neck fracture, or SCFE

Question 30

Iliofemoral Line drawn from

Answer 30

smooth line along outer ilium, across joint and onto femoral neck

Question 31

Iliofemoral line is important because

Answer 31

bilateral asymmetry indicates SCFE, dislocation, fracture, dysplasia

Question 32

Femoral Angle is drawn from

Answer 32

two lines drawn through and parallel to the mid axis of the femoral shaft and femoral neck
aka Mikulicz’s angle

Question 33

Femoral angle normal is

Answer 33

120-130
<120 Coxa Vara
>130 Coxa Valga

Question 34

Skinners line drawn from

Answer 34

line drawn through and parallel to the femoral shaft. A perpendicular line drawn to the tip of the greater trochanter

Question 35

skinners line important bc

Answer 35

if fovea capitus falls below indicates fracture, pagets, coxa vara

Question 36

Klein’s line drawn through

Answer 36

line drawn along outer margin of the femoral neck

Question 37

Klein’s line important because

Answer 37

fail to intersect indicates SCFE

Question 38

Boehler’s angle is drawn via

Answer 38

three highest points on the superior aspect of the calcaneus connected with two lines

Question 39

Boehler’s angle indicates

Answer 39

<28 degrees indicates calcaneal fracture