Lecture 16: Pelvic Joints Flashcards
What are the joints of the pelvis?
- Sacroiliac
2. Pubic Symphysis
What is the articulation for the sacroiliac joint?
between sacrum and ilium
Joint type of sacroiliac?
a) anterior is synovial modified planar with interlocking irregular articular surface
b) posterior is syndesmosis formed by interosseous sacroiliac ligaments
What are the ligaments of the sacroiliac joint?**
a) anterior sacroiliac ligs
b) posterior sacroiliac ligs
c) sacrotuberous lig
d) sacrospinous lig
e) iliolumbar lig
The anterior sacroiliac ligaments form the ______
capsule thickening
The posterior sacroiliac ligaments
- continuation of interosseous sacroiliac ligs
- restrict depression/wedging of sacrum and elevation of hips**
Sacrotuberous and Sacrospinous ligaments BOTH limit what?
limit posterior rotation of coccyx (posterior tilt of sacrum)**
Iliolumbar ligament limits
anterior slide of L5**
Greater sciatic foramen of sacroiliac joint is formed by
a) greater sciatic notch superior and anterior
b) sacrotuberous lig posterior
c) sacrospinous lig inferior
Greater sciatic foramen of sacroiliac joint contents**
- sciatic nerve
- superior and inferior gluteal artery/nerve/vein
- piriformis
What happens when there is a pathology of one of the contents in the greater sciatic foramen?
the foramen will not expand so if the piriformis hypertrophies, it squeezes the sciatic nerve causing pain and weakness down the leg
Lesser Sciatic Foramen of sacroiliac joint is formed by
a) lesser sciatic notch (anterior and inferior)
b) sacrotuberous lig posterior
c) sacrospinous lig superior
What muscle goes through the lesser sciatic notch?
obturator internus
Movements of the Sacroiliac Joint
a) limited gliding and rotation act as shock absorber
b) wedge shape of sacrum and fiber orientation of ligs pull the hips in (medial) when sacrum is driven down
What is the articulation for the pubic symphysis joint?
between pubic bones of R and L hip
