lower extremity - pelvis Flashcards
what are functions of the pelvis?
- common attachment for lower extremity & trunk muscles
- forces transmission between lower extremity & trunk
- aids muscles to support abdominal & reproductive organs
what does the pelvis connect?
the trunk to the lower extremity
what 3 aspects are part of the innominate bone?
- ilium
- ischium
- pubis
what 3 aspects are part of the innominate bone?
- ilium
- ischium
- pubis
what is another name for the hip bone?
innominate/coxal bone
what kind of joint is the sacroiliac joint?
- planar joint in children
- synarthrodial joint in adults
what bones are being articulated in sacroiliac joint?
- sacrum
- coxal bone
motions allowed of sacroiliac joint
- upward/downward
- anterior/posterior
- rotations
what rotations occur in sacroiliac joint?
- anterior/posterior
- nutation/counternutation
is the sacroiliac joint stable or unstable?
very stable
how is the sacroiliac joint stable?
- presence of thick & strong ligaments
- presence of rough articular surfaces with reciprocal geometry
what precent is the sacroiliac joint responsible for in lower back pain?
25%
what ligaments stabilize the sacroiliac joint?
- anterior sacroiliac ligament
- iliolumbar ligament
- interosseous ligament
- short & long posterior sacroiliac ligament
- sacrotuberous ligament
- sacrospinous ligament
describe motion of nutation/counternutation
nutation: posterior pelvic tilt
counternutation: anterior pelvic tilt
why is proper motion at sacroiliac joints so important?
- decreases stress at the joint
- pain can occur on affected or contralateral side if joint has lower mobility
