Acute IDD

Question 1

Acute IDD is more or less common than a persistent IDD?

Answer 1

Acute IDD is less common than persistent.

Question 2

Where is the MOST common region for an acute IDD?

Answer 2

Lumbar region

Question 3

Where is a rare region for an acute IDD?

Answer 3

Thoracic region

Question 4

What percent of IDDs are asymptomatic?

Answer 4

1-3%

Question 5

Acute IDDs are MOSTLY in what ages?

Answer 5

30-50 year olds

Question 6

What percentage of persistent IDD is the source of LBP?

Answer 6

5%

Question 7

95% occurs at which segment?

Answer 7

L4-S1 (lower lumbar)

Question 8

Where is the MOST common area for prevelance w/ A. IDD?

Answer 8

Posterolateral portion of the disc

Question 9

Why is the posterolateral portion weaker and thinner?

Answer 9

MORE vertical and LESS oblique annular fibers (not as resistant to injury)

Question 10

What are the two etiologies associated w/ trauma?

Answer 10

• Axial compression (vertical force)
• Forward bending or stooping w/o or w/ twisting/lifting

Question 11

In forward bending, where is majority of the motion coming from?

Answer 11

an anterior pelvic tilt

Question 12

Forward bending or stooping w/o or w/ twisting/lifting can lead to…. (2)

Answer 12

• LESS circumferential disc compression
• MORE anterior segmental shearing force due to the above plus pull of gravity, except less at L5, S1

Question 13

The structures involved in A. IDD are MORE commonly ____________and the end plate avulsion.

Answer 13

Outer annular tearing

Question 14

The structures involved in A. IDD are LESS commonly ____________ and nucleus pulposus herniation.

Answer 14

Inner annular tearing

Question 15

What happens once the disc structures are damaged?

Answer 15

They become immunoreactive; LARGE auto immune inflammatory response occurs.