Lines Xray

Question 1

Basilar angle

Answer 1

Platybasia, basilar impression

Question 2

McGregors line

Answer 2

> 8 males, >10 females, basilar impression

Question 3

Chamberlain

Answer 3

Basilar impression

Question 4

Macrae

Answer 4

Basilar impression

Question 5

ADI

Answer 5

> 3mm adults, 5mm children, transverse lig rupture or instability due to trauma, downs, inflam arthritis

Question 6

George’s

Answer 6

Discontinuation means anterolisthesis or retrolisthesis

Question 7

Posterior cervical line, aka spinolaminar junction line

Answer 7

Antero/retrolisthesis

Question 8

Stress lines cervical

Answer 8

Flx intersects c5/6

Ext intersects c4/5

Question 9

Prevertebral soft tissue

Answer 9

Soft tissue mass:
Retropharyngeal: >7
Retrolaryngeal: >14
Retrotracheal: >22

Question 10

Cobbs

Answer 10

Best for scoliosis

Question 11

Risser-ferguson

Answer 11

Scoliosis, not as good as Cobb

Question 12

Sacral inclination

Answer 12

Normal 30-72°

Average 46°

Question 13

Lumbosacral angle

Answer 13

Normal 26-57°

Average 41°

Question 14

Myerdings

Answer 14

Determines degree of anterolysthesis in a spondy

Question 15

Ullman

Answer 15

L5 beyond perp line means spondy

Question 16

Eisenstein , Sagittal canal

Answer 16

<15 mm means spinal canal stenosis

Question 17

Canal body ratio

Answer 17

The higher the ratio the smaller the canal, stenosis

Question 18

Lumbosacral disc angle

Answer 18

10-15° normal

Question 19

Lumbar gravity line

Answer 19

Ant to sacrum is hyperlordosis

Post to sacrum is hypolordosis

Question 20

Macnab

Answer 20

If one intersects the SAF of the vert below, ext malposition or facet imbrication

Question 21

Hadley s curve

Answer 21

If interrupted facet imbrication

Question 22

Kohler

Answer 22

Protrusion acetabuli

Question 23

Shenton

Answer 23

If interrupted: dislocation, neck fracture, slipped cap fem epiph

Question 24

Iliofemoral line

Answer 24

Bilateral asym: SFCE, disloc, frx, dysplasia

Question 25

Femoral angle

Answer 25

<120 coxa Vera | >130 coxa valga

Question 26

Skinner line

Answer 26

If fovea capitus falls below line, frx or coxa vara

Question 27

Klein

Answer 27

Failure of fem head to intersect is SCFE

Question 28

Patellar position

Answer 28

Patellar tendon and patella should be similar in length, or else patella alta

Question 29

Heel pad measurement

Answer 29

>25mm male or >23 female, acromegaly

Question 30

Boehler angle

Answer 30

<28° calcaneal frx or dysplastic calcaneus