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Flashcards in Lumbar Pelvic_Sacrum Deck (144)
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1

What are the 4 primary functions of the pelvis?

1. bear weight
2. transfer loads from axial skeleton to appendicular skeleton
3. stable, limited mobility --> more efficient transfer of loads
4. serves as strong attachment point for muscles

2

Prominent bony features is a feature of which gendered pelvis?

male

3

Narrow, heart shaped pelvic inlet is a feature of which gendered pelvis?

male

4

Narrow distance b/n ASIS and Ischial tuberosity is a feature of which gendered pelvis?

male

5

Laterally facing acetabulum is a feature of which gendered pelvis?

male

6

Narrow pubic arch (70˚) is a feature of which gendered pelvis?

male

7

Less prominent bony features (rounded) is a feature of which gendered pelvis?

female

8

Wide, oval pelvic inlet is a feature of which gendered pelvis?

female

9

Wide distance between ASIS and Ischial tuberosities is a feature of which gendered pelvis?

female

10

Anteriorly facing acetabulum is a feature of which gendered pelvis?

female

11

Wide pubic arch (90˚-100˚) is a feature of which gendered pelvis?

female

12

What are 3 implications of gender differences in pelvic structure:

1. different mechanics in gait (acetabulum orientation)
2. smaller base of support for males in sitting (@ ischial tub)
3. Different moment are, length-tension relationships for musculature

13

Males sit back on the _________ because they have closer _________________.

sacrum

ischial tubs

14

Females purch-up on the ______________

ischial tuberosity

15

List the muscles involved in pelvic/lumbar/sacral support and function:

Obturator externus, piriformis, gluteus minimus, superior gemellus, inferior gemellus, obturator internus, quadratus femoris, gluteus medius, gluteus maximus, and iliotibial tract

16

Pelvis has large influence on the _________, _________ and ___________.

trunk, hip and knee

17

The muscle attachments help:

1. transmission of loads
2. position influences length/tension relationships of muscles

18

What are the primary muscles involved in maintaining a unilateral stance of the frontal plane?

• Right hip abductor (glut medius)
• Left lumbar erector spianae

19

In a right hip tilt the glut medius is responsible for ________________________________. The left lumbar erector spinae are responsible for ________________________.

acting on the pelvis to pull into right lateral tilt

acting on pelvis to pull into right lateral tilt

20

Describe the characteristics of force couples:

- parallel forces
- equal magnitude
- opposite directions
- separated by some distance

21

Lumbo pelvic rhythm =

coupled motion b/n pelvis and lumbar spine

22

What can the lumbopelvic rhythm increase?

overal trunk motion for function

23

In research, the lumbar angle to hip angle was calculated using ratios during 25% of ___________________ phase

extension

24

@ 0-25% extension phase the L/Hip ratio =

0.26

25

@ 25-50% extension phase the L/Hip ratio =

0.61

26

@ 50-75% extension phase the L/Hip ratio =

0.81

27

@ 75-100% extension phase the L/Hip ratio =

2.3

28

ratio

hip dominate

29

>1 (L/H ratio) =

lumbar dominating

30

During extension what region dominates in early phase?

hip