Pelvic Girdle - Biomechanics Flashcards Preview

MS II > Pelvic Girdle - Biomechanics > Flashcards

Flashcards in Pelvic Girdle - Biomechanics Deck (79)
Loading flashcards...
1

What are the 4 ligaments of the pelvic girdle?

- Iliolumbar ligament
- Ventral sacroiliac ligament
- Sacrotuberous ligament
- Sacrospinous ligament

2

What ligament attaches the L-spine to the innominate bone?

Iliolumbar ligament

3

What are the 4 joints/ aspects of the pelvic girdle system?

- Lower L-spine
- Sacroiliac joints
- Pubic symphysis
- Hip joint

4

What type of joint is the pubic symphysis?

- Amphiarthrodial

5

What is the function of the pubic symphysis?

- Increases stability at the sacroiliac joints

6

What 2 structures provide stability at the pubic symphysis?

- Fibrocartilaginous disc
- Arcurate ligaments

7

What type of joints are the sacroiliac joints?

- Diarthrodial (synovial) --> Become amphiarodial with age

8

How do the shape of the articulations of the sacroiliac joints change with age?

- They are flat until puberty when they develop grooves and ridges

9

Which aspect of the sacroiliac joints are covered with hyaline cartilage, and which are covered with fibrocartilage? Which surface of the sacroiliac joint is thicker?

- Sacral surface covered with hyaline/ thicker
- Ilial surface covered in fibrocartilage

10

Which aspect of the sacroiliac joint is susceptible to osteoarthritis?

- Ilial surface

11

What is the shape of the articular surface of the SIJ in the sagittal plane?

- Kidney shaped

12

How is the long arm of the sacroiliac joint oriented?

Anterior-posterior

13

How is the short arm of the sacroiliac joint oriented?

Superior-inferior

14

At which levels of the sacrum does the sacroiliac joint articulate? (males/ females)

Males: S1 - S3/4
Females:S1 - S2

15

What spinal segments innervate the anterior capsule of the SIJ? Which spinal segments innervate the posterior capsule of the SIJ?

L2 - S2
L4 - S4

16

What are the 3 function sof the pelvic girdle?

- Base for superincumbent body weight
- Links the body to the lower extremities
- Supports the viscera

17

What 5 structures form the posterior arch of the pelvic girdle?

- Lower extremities
- Acetabulae
- Ilia
- Sacroiliac joint
- Upper 3 sacral vertebra

18

What 5 structures form the anterior arch of the pelvic girdle?

- Lower extremities
- Acetabulae
- Pubic bones
- Disc
- Pubic symphysis

19

Describe the 3 factors causing the keystone effect of the pelvic girdle.

- Innominate bones produce lateral to medial forces against the sacrum from the arches
- Sacrum is wider at base wedges into the innominate bones
- Body weight presses the sacrum into the innominate bones

20

What is meant by form closure?

- Structure of the bony arches creates stability

21

What is meant by force closure?

- Core muscles support pelvic girdle

- Transverse abdominis
- Pelvic floor muscles
- Diaphragm
- Lumbar multifidi

22

What are 2 common historical findings that may change form closure of the pelvis?

- Child birth
- Multitrauma (fall from heights, MVAs)

23

What are the 3 effects of a horizontally oriented sacrum?

- Increased lumbosacral angle
- Increased load to anterior ligaments
- More risk to SIJ

24

What are the 3 effects of a vertically oriented scarum?

- Decreased lordosis
- Loose packed position of lumbar spine
- More risk to lumbar spine

25

Which gender is more likely to have a horizontally oriented sacrum?

- Females

26

Which gender is more likely to have a vertically oriented sacrum?

- Male

27

What determines the shape of the SI joint?

- The development of the spinal curves

(more development --> more motion at SI joint)

28

Which sacral position is more dynamic? Which is more static?

Horizontal --> Dynamic
Vertical --> Static

29

What are the 3 axes of motion of the ilia? Through which structures do they pass, and what motion occurs around them?

Horizontal axis:
- Through SIJs
- Anterior/ posterior rotation
Oblique A/P axis
- Through SIJ and pubic symphysis
- Inflare/ outflare motion
Straight translation:
- Upslip / downslip motion

30

What are the 2 axes of motion at the pubis?

Horizontal axis
- Through pubic symphysis
- Anterior / posterior rotation

Translation:
- Upslip
- Downslip