Sacroiliac Joint Inflammation.
Basic Anatomy of the Sacroiliac Joint: The Sacroiliac joint connects the bottom of your spine with your pelvis. This joint has a very small range of motion but is crucial to transferring the weight of your upper body to your legs.
Abnormal movement in the sacroiliac joint generates excruciating localized pain around the dimples in the upper buttocks and possibly referred pain - SI syndrome. With SI syndrome, the irritation and inflammation also affect nerves that provide sensation to other areas, like the groin, hips, and front of the thigh areas.
Symptoms of Sacroiliac (SI) Syndrome. You will feel pain when:
Straightening up from a stooped position
Lifting an object
Twisting your body
Leaning forward
Bending backward
Sitting for long periods of time
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