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jld15
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what line does the ventral sacral ligament go above and below?
Arcuate line
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Dorsal SI
- Very strong
- Contains upper and lower fibers
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Dorsal SI upper fibers
- PSIS to 1st 2 tubercles on intermediate sacral crest
- Resists out flare, nutation!!
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Dorsal SI lower fibers
- PSIS to lower lateral and intermediate tubercles on sacral crest
- Maintain position of sacrum on ilium
- Prevents downward shear of sacrum on ilium
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Interosseous sacroiliac ligaments
- Holds SI joint together
- Limits deep palpation of posterior pelvis
- Very strong
- Resists everything- out flare, compressed with inflare, nutation/counter nutation, shear
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Pelvic ligaments
- Sacrotuberous ligament
- Sacrospinous ligament
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Sacrotuberous ligament
- Merge with posterior sacroiliac ligament
- Come for PSIS and lateral crest of sacrum and inserts onto ischial tuberosity
- Attachment for gluteus maximus
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Sacrospinous ligament
- Lower part of ventral to ischial spine
- Convert greater/lesser sciatic notch into foramen
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Local muscular support muscles
- Lumbar multifidi
- --support sacrum
- Transverse abdominus
- Pelvis floor
- --connect pelvis and sacrum to pubis and positions in stable position
- Quadratus lumborum
- -- moves iliac crest
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Global support muscles
- Rectus abdominus
- External oblique
- Internal oblique
- Erector spinae
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Other muscles that stabilize
- Piriformis
- --stabilize connections of LE
- gluteus maximus
- hamstrings
- iliopsoas
- latissimus dorsi
- -attaches on Thoracodorsal fascia
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hip joint articulation
a synovial joint of the ball and socket type between the head of the femur and the acetabulum
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functions of hip
- flex/ext
- int/ext rotation
- circumduction
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ligaments that resist extension
- anterior longitudinal
- lumbosacral (extreme)
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