chapter 17 pelvis

Question 1

what is the function of the pelvis

Answer 1

supports weight of body through the vertebral column
receives ground forces when foot contacts the ground

Question 2

what are the bones structure of the pelvis

Answer 2

Sacrum
Coccyx
Two pelvic (hip) bones each with:
Ilium
Ischium
Pubis

Question 3

define the lumbosacral joint

Answer 3

L5 & S1
disk & vertebral bodies : cartilaginous joint &
2 facet joints: synovial joints

Question 4

define the sacroiliac joint

Answer 4

nonaxial synovial joints

Question 5

define the symphysis joint

Answer 5

Cartilaginous joint

Question 6

what is the function of the sacroiliac joint

Answer 6

Transmit weight from the upper body through the vertebral column to the hip bones
Designed for stability (not mobility)
2-3 mm motion

Question 7

the sacrum were does it articulates

Answer 7

Articulates with L5 at an angle called the 
“lumbosacral angle”

Question 8

the posterior side of sacrum define the auricular surface

Answer 8

forms SI Joint b/n sacrum and ilium)

Question 9

superior articular process define

Answer 9

forms Lumbosacral joint – between L5 & Sacrum

Question 10

what does psis and the attachment

Answer 10

posterior superior iliac spine attachment for posterior SI ligaments

Question 11

the posterior inferior iliac spine the attachment

Answer 11

sacro-tuberous ligament

Question 12

the ischial tuberosity function

Answer 12

weight bearing surface when you are sitting

Question 13

interosseous sacroiliac function

Answer 13

Deepest, shortest, and strongest of the sacroiliac ligaments.

Connects the tuberosity of the ilium to the sacrum

Question 14

short posterior sacroiliac

Answer 14

Prevents forward movement of the sacrum

Question 15

long posterior sacroiliac

Answer 15

Prevents downward movement of sacrum

Question 16

what are the function of the sacrotuberous

Answer 16

Attachment for gluteus maximus
Prevents forward rotation of the sacrum
Strong, triangular-shaped
Running from
Between the PSIS and PIIS
Posterior and lateral side of the sacrum inferior to auricular surface
Coccyx

Question 17

the function of sacrospinous

Answer 17

This and sacrotuberous ligament convert the greater sciatic notch into a foramen
For sciatic nerve passage

Triangular-shaped
Deep to the sacrotuberous ligament

Broad attachments
Lower, lateral sacrum and coccyx, posteriorly
Spine of the ischium

Question 18

the pubic symphysis the function

Answer 18

Cartilaginous Joint
Fibrocartilage disk lies between the two pubic bones
Allows for slight movement during childbirth

Question 19

Angle ↑ if pelvis tilts its

Answer 19

anteriorly

Question 20

Angle ↓ if pelvis tilts its

Answer 20

posteriorly

Question 21

Forward movement of L5 on S1 prevented by

Answer 21

Ligamentous support
Shape and fit of inferior articular process of L5 inside
Superior articular process of S1 behind

Question 22

what landmarks are used to determine if the pelvis is anteriorly or posteriorly

Answer 22

ASIS (Anterior Superior Iliac Spine)
Pubic Symphysis

Question 23

what is the neutral angle of pelvis

Answer 23

30

Question 24

an increase of the lumbar sacral angle increase what force

Answer 24

shear force between the l5 between s1

Question 25

when the lumbosacral increased angle is

Answer 25

increased lordosis is anterior tilt, hip flexion

Question 26

posterior pelvic tilt is when

Answer 26

the lumbar spine (lower spine) moves posterior also – which decreases the lumbosacral angle- flexion thus hip is using extensor

Question 27

what is a force couple in the anterior pelvic tilt

Answer 27

muscles on the anterior aspect of the body is pulling the anterior pelvis down while the muscles on the back of the body are pulling the posterior aspect of the pelvis up – then you have an anterior pelvic tilt

Question 28

what are the muscles for posterior tilt

Answer 28

trunk flexors- abdominals hip extensor

Question 29

To control or limit the amount of lateral tilting

Answer 29

Opposite muscle groups work as a force couple Reversal of muscle function action

Question 30

he right hip becomes closer to the midline thus

Answer 30

right hip adduction

Question 31

the left hip angle is now farther from the midline

Answer 31

left hip abdcution

Question 32

the sagittal plane of frontal axis is

Answer 32

anterior and posterior pelvic tilt

Question 33

frontal plane about a sagittal axis

Answer 33

lateral pelvic tilt and pelvic elevation

Question 34

concentric contraction of the right quadratus lumbar to which side of lateral pelvic?

Answer 34

left

Question 35

the right quadratus lumborum to which side during pelvic elevation

Answer 35

right

Question 36

what movements happens when the pelvic left side rotate forward

Answer 36

right medial rotation and left hip lateral rotation

Question 37

what movements happens when the pelvic left side rotate backward

Answer 37

right hip lateral rotation and left hip medial rotation

Question 38

what is the effect of the lumbar spine when the pelvic tilt anteriorly

Answer 38

lumbar extension

Question 39

what is the effect of the lumbar spine when the pelvic tilt posteriorly

Answer 39

lumbar flexion

Question 40

when an individual maintenance a persistent anterior pelvic tilt posture which muscles group is shorted

Answer 40

hip flexors, lumbar extensor

Question 41

when an individual maintenance a persistent anterior pelvic tilt posture which muscles group is weaker

Answer 41

hip extensor, lumbar flexors

Question 42

name two ligaments that help prevent anterior shear of l 5 and s1

Answer 42

Iliolumbar , anterior longitudinal ligaments, lumbosacral