Lumbar Metrics

Question 1

What is the normal measurement of lumbar lordorsis?

Answer 1

50-60 Degrees

Question 2

An increased angle is implicated as a mechanical factor in producing what?

Answer 2

Low Back Pain

Question 3

The center of gravity of the trunk passes through the center of L3 body and continues vertically to intersect what?

Answer 3

Sacral Base

Question 4

If the line passing the center of L3 body passes anterior to sacrum by more than 0.5in, there may an an incase in shearing forces anterior between what?

Answer 4

Lumbosacral Apophyseal Joints

Question 5

A posterior shift on the gravity line may indicate increased weight bearing forces on what?

Answer 5

Posterior Lumbosacral Joints which causes LBP

Question 6

Posterior weight bearing increases stress on what?

Answer 6

Pars Interarticularis

Question 7

What line should lie about the tip of adjacent superior articular process?

Answer 7

Macnab’s LIne

Question 8

If macnab’s line intersects superior articulating process, what may be present?

Answer 8

Facet Imbrication (subluxation)

Question 9

The effect of facets overriding is to mechanically infringe on what?

Answer 9

Size of IVF and lateral recess

Question 10

With macnab’s line there is a high incidence of abnormal findings in whom?

Answer 10

Asymptomatic Individuals

Question 11

What key region is normally a smooth transition across joint space?

Answer 11

Hadley’s S Curve

Question 12

An abrupt interruption of hadley’s S curve causes what?

Answer 12

Facet Imbrication (subluxation)

Question 13

A wide facet joint will cause what?

Answer 13

Disc Derrangment

Question 14

If what line is >1.5mm it may be nuclear, annular, and posterior ligament damage?

Answer 14

Van Akkerveeken’s

Question 15

Van Akkerveeken’s is best performed with what view?

Answer 15

Extension Film

Question 16

What is a sign of degenerative lumbar instability?

Answer 16

No lateral segmental displacement on vertebral body

Question 17

What is a sign of ligamentous laxity of posterior joints or altered mont mechanics?

Answer 17

Pedicle Postion (should show progressive rotation)

Question 18

What shows a poor correlation among abnormal findings and clinical symptoms?

Answer 18

Spinous position

Question 19

The spinous position should show a gradual spinous deviation of each successive segment into what?

Answer 19

Concavity of Curve

Question 20

When the lines of the lateral bending studying converge toward bending side in gradually increasing the manner from what?

Answer 20

Lumbosacral Junction up

Question 21

Localized segmental failure to lateral flexion may indicate what?

Answer 21

Posteriolateral disc herniation

Altered function of posterior joints`

Question 22

How many grades are there on the meyerding’s method?

Answer 22

4

Question 23

Anterior inferior L5 body corner should lie posterior to or just contact what?

Answer 23

Ullmann’s Line

Question 24

What line connect tips of superior and inferior articular processes at each level?

Answer 24

Articular Process Line

Question 25

To find the posterior body margin locate measurement point at what?

Answer 25

Posterior Body Margin (btwn superior and inferior endplate)

Question 26

To find the sagittal canal measurement, measure the distance between what?

Answer 26

Posterior Body and Articular process line

Question 27

What is the line that intersects the bottom half of L4 body or L4-L5 disc and is the most stable position?

Answer 27

Intercrestal Line

Question 28

An increase in the intercrestal line passing through the upper half of L4 causes what?

Answer 28

L4/L5 Degeneration

Question 29

A decrease in the intercrestal line passing through the body of L5 causes what?

Answer 29

L5/S1 Degeneration