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Flashcards in Lumbar Biomechanics Deck (34)
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1

What does current literature suggest is the common source of lumbar pain

The facet joints

2

What direction do the discs mainly allow for movement

flexion and extension

3

Which vertebra is the widest

L5

4

What is the average lumbar lordosis angle

50-60 degrees

5

What is the normal lumbosacral angles. What is the average angle

26-57 degrees
41 degrees

6

What attribute does the relationship between the flexibility and resistance to compression give the lumbar spine

curves make the spine function like a spring

7

What is the disc:body ratio in the lumbar vs thoracic vs cervical

1:3 (L) vs 1:5 (T) vs 2:5 (C)

8

What does the ratio for disc:body increase

increases shock absorption

9

Where is the nucleus pulposus located in the lumbar spine

posterior 1/3 of disc

10

Where is the most common site for tropism

Lumbar facets are site of facetal tropism
leads to increase cartilage wear, and increased disc stress

11

Are there more or less anomalies of the SP's in lumbars compared to thoracics

fewer

12

When do the vertebral end plates ossify

Outer rim is ossified around age 14-15

13

What is Wolffs Law

Form follows function
increased stress/pressure = increased bone growth

14

Which type of bone does Wolffs Law apply

mature bone

15

What is Heuter Volkman's Law

increased pressure across an epiphyseal growth plate inhibits growth, whereas decreased pressure accelerates growth

16

How does Heuter Volkman's Law explain idiopathic scoliosis

increased pressure on the concave side
decreased pressure on the covex side

17

What is Scheurmanns disease

idiopathic process that effects ossification of the outer rim of the end plate resulting in vertebral wedging leads to increased kyphosis

18

How much of trunk flexion occurs in the lumbar spine

75%

19

What is the trend for flexion as you travel down the spine

motion increases in a superior to inferior direction

20

What is the GROM of flexion of the lumbar spine

40-60 degrees

21

What is the GROM of extension in the lumbar spine

20-35 degrees

22

What is the trend for flexion as you travel down the spine

increase superior to inferior

23

What is the IAR for flexion in the lumbar spine

Anterior disc

24

What is the IAR for extension in the lumbar spine

posterior disc

25

What is the GROM of rotation in the lumbar spine

5-18 degrees

26

Which segment has the greatest range of motion related to rotation in the lumbar spine

L5-- approximately 5 degrees of rotation

27

What is the IAR in the lumbar spine during rotation

posterior annulus on the contralateral side

28

What is the GROM for lateral flexion for the lumbar spine

15-25 degrees

29

What is the trend for lateral flexion as you travel down the lumbar spine

less lateral flexion as you travel down the spine

30

What is the IAR for lateral flexion in the lumbar spine

contralateral disc