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  • Sacroiliac Joint Anatomy

    Sacroiliac Joint Anatomy

    Let’s talk about some sacroiliac joint anatomy. The sacroiliac (SI) joint is the articulation between the sacrum and the iliums of the coxal bones. The anterior sacroiliac joint ligaments blend with the fibers of the iliacus muscle at its origin in the iliac fossa. What does this mean?

    This means that misalignments/tension/lack of ROM at the SI joint can be caused by iliacus being either too tight or not having enough tone. Iliacus is directly effected by activity, or the lack thereof, and the tone or lack of tone in psoas major, as well as the position of the femur and tension patterns in gluteus maximus.

    The sacrotuberous ligament blends with the posterior sacroiliac ligament. What does this mean? This means that tension or lack of mobility in the sacrotuberous ligament can cause issues with ROM in the SI joint. So, what effects the sacrotuberous ligament?

    The sacrotuberous ligament attaches to the ischial tuberosity and then becomes the fascia of the biceps femoris muscle. Tension or lack of tone in biceps femoris will effect the tone and mobility of the sacrotuberous ligament. The thoracolumbar fascia blends with the sacrotuberous ligament which then adds fibers to the fascia of the gluteus maximus muscle. Any of these tissues can effect the mobility of the sacrotuberous ligament, which will in turn effect the ROM and alignment of the SI joints.

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    That is a mouthful!! In our SMRT: Hips, Lower Back, & Abdomen 24 CE, 3-day course, we will teach you to effectively, quickly, and easily work with all of the structures named above. Reestablishing tissue balance and mobility in the posterior hip and sacrum area, as well as ROM and alignment in the SI joints, can have a profound effect on lumbo-pelvic-hip complex and pain in that area.

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