Common Causes Of SIJ Pain

SIJ pain refers to pain or discomfort originating from the sacroiliac joints, which are located where the sacrum (the triangular bone at the base of the spine) meets the iliac bones (the large pelvic bones). These joints are essential for shock absorption and transferring forces between the upper body and legs during activities such as walking or running.

1. Joint Dysfunction: The most common cause of SIJ pain is dysfunction of the sacroiliac joints, which can occur due to abnormal movement (hypermobility or hypomobility). This dysfunction can lead to inflammation, irritation, and pain.

2. Trauma or Injury: Injuries such as a fall, direct impact to the pelvis, or motor vehicle accident can damage the ligaments around the sacroiliac joints, causing pain.

3. Pregnancy: During pregnancy, hormonal changes can loosen the ligaments around the sacroiliac joints to prepare for childbirth. This increased mobility can lead to instability and pain in the SIJ.

4. Degenerative Changes: Wear and tear over time, such as osteoarthritis or degenerative joint disease, can affect the sacroiliac joints and contribute to pain.

5. Inflammatory Conditions: Conditions like ankylosing spondylitis or psoriatic arthritis can cause inflammation of the sacroiliac joints, leading to pain and stiffness.

6. Leg Length Discrepancy: A significant difference in leg lengths can lead to uneven stress on the sacroiliac joints, resulting in pain.

  1. -Pain: The primary symptom is pain in the lower back, buttocks, hips, or groin. The pain is typically localized and may be felt on one side or both sides of the lower back.
  2. -Radiating Pain: Pain may radiate into the thighs or down the legs, mimicking sciatic pain.
  3. -Stiffness: Stiffness or a feeling of tightness in the lower back or pelvis, especially after prolonged sitting or standing.
  4. -Instability: Some individuals may experience a feeling of instability or weakness in the pelvis, making activities like walking or climbing stairs challenging.
  5. -Pain with Activities: Pain may worsen with activities that involve standing, walking, or transitioning from sitting to standing.
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