Topic 10 Flashcards

1
Q

what are the functions of the pelvis

A

support and protects pelvis viscera and lower abdominal viscera.

provides bone support for the birth canal and therefore an exit for the foetus.

provides extensive muscle attachment sites

supports the weight of the head, trunk and upper limbs.

allows for weight transfer when sitting.

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2
Q

what does the pelvic inlet house

what is its function

A

pubic crest
pectineal line
arcuate line
sacral alar and promontary

communicates with abdominal cavities.

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3
Q

what is the pelvic outlet

function

A

cocyx
ischial tuberosities
pubic symphysis

provides a passageway for child birth.

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4
Q

where is the true and false pelvis

A

true pelvis is inferior to pelvic inlet

false pelvis is superior inlet.

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5
Q

pubic symphysis joint

A

secondary cartilage
fibrocartilage disc between two symphyseal surfaces of both the pubic bones.
limited movement

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6
Q

sacroiliac joint

A

anterior - synovial plane
posterior - fibrous due to interosseous ligaments

articular surfaces - auricular surface of ilium and auricular surface of sacrum.

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7
Q

ligaments of the sacroiliac joint

A

anterior:

  • anterior sacroiliac ligament
  • interosseous sacroiliac ligament
  • iliolumbar ligament

all stabilise sacroiliac ligament and prevent anterior and inferior slide of sacrum

posterior:

  • posterior sacroiliac ligament - stabilises
  • sacrotuberous ligament - limit nutation
  • sacrospinal ligament - limit nutation
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8
Q

what are the forces that act on the pelvis

what mechanisms stabilize the joint

A

weight of trunk, head and arms
gravity

form closure - passive structures (joint surface alignment, joint surface configuration and ligaments being under tension).

force closure - active structures (muscles and fascia interacting together and acting on joints to enhance compression in order to increase stability).

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9
Q

movements of pelvis in coronal plane

AP axis

A

pelvis drop (abduction) - ipsilateral gluteus medius and contralateral hip adductors.

pelvic life (adduction) - contralateral gluteus medius and ipsilateral hip adductors

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10
Q

movements of pelvis in sagittal plane - transverse axis

A

anterior pelvis tilt - produced by hip flexion (hip flexors).

posterior pelvic tilt - produced by hip extension (hip extensors).

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11
Q

movements of pelvis in horizontal plane

longitudinal axis

A

pelvis rotation to the right - left hip external rotators and right hip medial adductors

rotation to the left - right hip external rotators and left hip medial rotators.

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