Lec 4- Lumbar Biomechanics and Static Listings

Question 1

The lumbar facets are along the ____ plane until about L5-S1 where they become ___ plane

Answer 1

sagittal plane until L5-S1 –> become coronal plane

Question 2

Lumbar facets carry:
o ___% of axial load in neutral position
o ___% in extended position
o ___% of torsional strength

Answer 2

18% : neutral position
33% : ext.
45% : torsional

Question 3

Why are younger pt’s btw the age of 20-40 more a risk of developing disc protrusion or prolapse?

Answer 3

bc there is water in the disc

Question 4

Water imbibition reduces the state of ___

Answer 4

preloading the vertebra

Question 5

during distraction of the disc thr pressure descreases and draws _____ back in

This causes a decrease in what two conditions?

Answer 5

draws the nuclear material back in

cc: decreases chances of having a disc protrusion or prolapse

Question 6

___ % of trunk flexion nd extension occurs in the lumbar spine

Answer 6

75%

Question 7

during flexion: the nucleus moves ____, increasing the pressure on the ____ of the disc

Answer 7

moves POSTERIOR

• increases the pressure on the posterior annular fibers of the disc

Question 8

during extension: the nucleus moves ____, increasing the pressure on the ____ of the disc

Answer 8

moves Anterior

• increases the pressure on the anterior annular fibers of the disc

Question 9

What 4 structures limit flexion of the lumbar spine

Answer 9

1. lig flavum
2. PLL
3. Capsular lig
4. Interspinous lig

Question 10

What 4 structures limit extension of the lumbar spine

Answer 10

• ALL
• Anterior annulus fibers
• Facet jts: what really restricts it
• SP’s

Question 11

What 5 structures limit lateral flexion

Answer 11

o capsular lig
o ligamentum flavum
o intertransverse lig
o deep lumbar fascia on contra side

** mostly by facets

Question 12

Lumbar lateral flexion is coupled with: ______

Answer 12

contralateral rotation of the vertebra

Question 13

M of lumbar lateral flexion

Answer 13

QL

Psoas

Question 14

____ static listing is: R. rotation & R. Lateral Flexion

Answer 14

PRS

Question 15

____ static listing is: L. rotation & L. Lateral Flexion

Answer 15

PLS

Question 16

\_\_\_\_ static Listing is: 
The SP is: 
•	posterior 
•	Right 
•	Superior

Answer 16

PRS

Question 17

____ static Listing is :
The SP is :

• Posterior
• Left
• Superior

Answer 17

PLS

Question 18

____ static listing: Right rotation and left Lateral Flexion

Answer 18

PRI

Question 19

____ static listing: Left Rotation and right lateral flexion

Answer 19

PLI

Question 20

____ static listing is:

The SP is :

• Post
• Right
• Inferior

Answer 20

PRI

Question 21

____ static listing is:

The SP is :

• Posterior
• Left
• Inferior

Answer 21

PLI