What is my SI joint (Sacroiliac joint) and why is it causing back Pain?

What is my SI joint (Sacroiliac joint) and why is it causing back Pain?

The sacroiliac (SI) joint lies between the sacrum and the ilium bones of the pelvis. There are two joints, one on each side of the sacrum. The SI joint serves to transfer weight from the upper body to the lower limbs. Strong ligaments and muscles stabilize the...

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