MS III SI joint 1

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MS III SI joint 1
2013-11-10 17:06:44

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  1. 3 bones and 3 joints of the pelvis
    • bones: 2 innominates and a sacrum
    • joints: 2 SI jts and the pubic symphysis
  2. iliac bone's surface where it interacts with the sacrum
    • crescent shaped
    • concave posterosup, and around the rim, except inf -- it's an upside down horse-shoe of concavity
    • a crest btwn 2 furrows
  3. ilium and sacrum, which has the thicker end plate?
    ilium, with lots of proteoglycans with collagen making up the fibrocartilage covering the joint
  4. shape of sacrum where it interacts w iliac
    corresponds to iliac... has a furrow bordered by 2 crests
  5. how does the hyaline cartilage compare, sacrum to iliac?
    it's 2-3x thicker on the sacrum (this asymmetry isn't seen anywhere else)
  6. inguinal lig attachments
    pubic tubercle --> ASIS
  7. iliolumbar lig attachments
    • TP of L4-5 to the iliac crest's inner lip on the
    • posterior side

    • only in bipedal animals
    • not present in humans until 2nd decade of life
    • thought to dev from a sprig of QL
  8. iliolumbar lig blends with what lig?
    anterior SI lig
  9. which pelvic lig pulls the lumbar spine into rot and how?
    iliolumbar lig -- it runs from iliac crest to L4-5 TPs, so if the innominate goes into post tilt it pulls on the lig which pulls on the spine
  10. sacrospinous lig attachments
    • ischial spine --> lateral region sacrum and coccyx
    • deep (ant) to sacrotub lig,
    • shares fiber space with sacrotub ligament.
  11. sacrospinous lig roll
    • works with sacrotuberous ligament to stop ilium rotation while allowing posterior rotation.
    • They're most notably stressed when a person leans forward or stands up.

    This pair of ligaments converts the greater and lesser sciatic notches into the greater and lesser sciatic foramens.
  12. sacrotuberous ligament attachments
    • sacrum (TPs down to upper coccyx)--> ischial tub
    • (remember, the hammies attach to ITs, so there's a rel w/biceps femoris)
  13. ant SI lig attachments and description
    anterior surface of the lateral part of the sacrum --> margin of the auricular surface of the ilium and to the preauricular sulcus

    • ant to SI jt
    • relatively thin
    • flat
    • described as a sling holding the front of the sacrum
    • CAN be injured and cause pain, but hard to diagnose bc can't be palpated
  14. posterior sacroliliac lig
    about the layers...
    • short interosseous lig: deepest, most horizontal
    • intermediate: takes up most space, running from the post arch of sacrum to mid-ilium, overlying most of the posterior part of the joint (superolat)
    • long posterior SI lig: from 3rd transverse tubercle of sacrum to the PSIS, has more vertical fibers, adding stability to the joint
  15. what kind of joint is the pubic symphysis?
    secondary cartilagionous joint, amphiarthrosis
  16. ligament connecting the pubic symp, and what's in it?
    interosseous lig (ant, post, and sup ligs), with a fibrocartilagionous disc in the middle
  17. what happens on each of the 3 horiz axes of the sacrum
    • sup (by the base) -- respiratory tipping
    • middle -- nutation (top tips ant) and counternutation
    • inf - flex/ext ??
  18. sacrum functions as an atypical ___
    lumbar vert
  19. SI jts function as atypical ___
    facet joints
  20. the innominate is functionally considered UE or LE?
  21. ILA - what is it?
    inferior lateral angle -- the lateral dips at the bottom of the sacrum  -- they're like atypical TPs
  22. iliopsoas attachments
    bodies of T12-L3 (psoas) +  inner iliac crest (iliacus) --> lesser troch
  23. QL attachments
    last rib and TPs of lumbar vert -->iliac crest and iliolumbar lig

    (T12-L4 nerves)