Anatomy: (cont.)

• Ligaments:

  • interosseous
    • forms posterior border
    • strongest ligament of support
  • anterior SI
    • weakest ligament--thickening of joint capsule
    • in close proximity to LS trunk and obturator nerve
  • accessory ligaments
    • iliolumbar: 3 distinct parts that may prevent translation/rotation of L-5
    • sacrotuberous
    • sacrospinous

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