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Iliolumbar Ligament
- TP L5 to iliac crest
- Prevents: anterior translation of L5 on sacrum
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Anterior Sacroiliac Ligament
- Covers entire front of SI joint
- Prevents: anterior traslation of sacrum, rotation, separation of sacrum and ilium
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Posterior Sacroiliac Ligament
- Covers entire back of SI joint
- Prevents: posterior translation of sacrum, rotation, separation of sacrum and ilium
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Sacrotuberous Ligament
- Sacrum to ischial tuberosity
- Prevents: anterior rotation of sacrum
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Sacrospinous Ligament
- Sacrum to ischial spine
- Prevents: anterior rotation of sacrum
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Interosseus Sacroiliac Ligament
- Between sacrum and ilia inside the SI joint
- Fibers run superolaterally
- Prevents: posterior translation of sacrum, separation, rotation, inferior translation of sacrum
- Strongest ligament in body
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Muscles that support SI joint
- Psoas major
- Iliacus
- Piriformis
- Gluteus Maximus
- Erector Spinae - anterior pelvic tilt
- Multifidi - anterior pelvic tilt
- Abdominal muscles - posterior pelvic tilt
- Hamstrings - posterior pelvic tilt
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Angle of inclination of femur
- Angle inf frontal plane between head/neck of femur and shaft
- approx 125 degrees in normal adult
- at birth approx 140 - 150 degrees
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Torsion Angle of Femur
- Angle between transverse axis of femoral condyles and axis of femoral head and neck
- Normally 10-15 degrees anteverted
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Iliofemoral Ligament of hip
- "Y-ligament"
- AIIS and anterior superior rim of acetabulum to intertrochanteric line
- Strongest ligament of hip joint
- Prevents: extension, external rotation (upper fibers)
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Pubofemoral Ligament of hip
- Anterior inferior rim of acetabulum and superior pubic ramus to intertrochanteric line
- Covers neck
- Prevents: ABduction, external rotation, extension
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Ischiofemoral Ligament of hip
- Posterior inferior rim of acetabulum to apex of greater trochanter
- Covers neck in back
- Prevents: Internal rotation, extension
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Position of best joint congruity of hip
Flexed, externally rotated, ABducted
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Position of closed pack of hip
Extended, internally rotated, ADducted
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