The sacroiliac joint or SI joint (SIJ) is the joint between t he sacrum and the ileum of the pelvis. The joint is strong, supporting the entire weight of the upper body. The human body has two sacroiliac joints, one on the left and one on the right that often match each other but are highly variable from person to person.

Sacroiliac joint dysfunction generally refers to pain in the sacroiliac region that is caused by abnormal motion in the sacroiliac joint, either too much motion or too little motion. It typically results in inflammation of the sacroiliac joint, and can be debilitating.

Sacroiliitis is a condition caused by any inflammation within one, or both, of sacroiliac joints.

People suffering from Sacroiliitis can often experience symptoms in a number of different ways, however it is commonly related to the amount of pressure that is put onto the sacroiliac joint. Sacroiliitis pain is typically axial, meaning that the location of the condition is also where the pain is occurring. Symptoms commonly include prolonged, inflammatory pain in the lower back region, hips or buttocks.

However, in more severe cases, pain can become more radicular and manifest itself in seemingly unrelated areas of the body including the legs, groin and feet.

Symptoms are typically aggravated by:

  • Transitioning from sitting to standing
  • Walking or standing for extended periods of time
  • Running
  • Climbing stairs
  • Taking long strides
  • Rolling over in bed

misc image