Bones and ligs of pelvis Flashcards
Lesser pelvis
Considered the true pelvis, lies below the pelvis brim
Sacroiliac joint
primary function is to transmit weight from vertebra to pelvis (shock absorption)
cartilage type for ilium
fibrocartilage
cartilage type for sacrum
hyaline cartilage
classification of sacroiliac joint
-inferior 2/3: nonaxial plane synovial (diarthroidal)
-Superior 1/3: fibrous syndesmosis (amphiarthroidal)
Sacroiliac movements permitted
Smooth gliding movement
nutation and counternutation
sacroiliac joint capsule
surrounds inferior diarthroidal portions and separates it from the superior amphiarthroidal portion
Relaxin
hormone that increases ligament pliability due to pregnancy
Ligaments of sacroiliac joint
-Interosseus sacroiliac
-Ant/post SI
-iliolumbar
-sacrospinous
-sacrotuberus
joint classification of Symphysis pubis (SP)
symphyseal joint
functionally ampiarthoidal
SPubis movements
small amounts of gliding occur with movements of the sacrum, vertebral column, and lower extremity
Spubis ligaments
superior pubic
arcuate / inferior pubic
Hip / Coxal joint articulating surfaces
-lunate surface of acetabulum
-femoral head
Hip / coxal joint classification
multiaxial ball and socket
Hip/coxal joint capsule
-hip joint is extremely strong even without supporting ligaments or muscles; the intact
capsule maintains ~150 psi of negative pressure (vacuum) within the joint
* zona orbicularis is a thickening of the joint capsule whose fibres that encircle the neck
Hip/coxal ligaments
-iliofemoral / Y lig (strongest)
-pubofemoral lig.
- ischiofemoral lig (weakest)
Pubofemoral lig limits..
hyperextension, LATERAL rotation and abduction
ischiofemoral lig limits..
hyperextension, abduction and MEDIAL rotation
Hip/coxal Bursae
-iliopectineal
-deep trochanteric
- superficial trochanteric
