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What is a Minimally-Invasive Sacroiliac (SI) Joint Fusion?

Minimally-invasive fusion of the sacroiliac (SI) joint is performed through a small incision using image-guidance to place two cylindrical threaded implants across the joint (from the ileum of the pelvis to the sacrum at the bottom of the spine). These implants are packed with compound that forms bone to connect the two bones and eliminate the painful joint.

Low back pain and the sacroiliac joint

The sacroiliac joint (SI joint) can be one of the sources of low back pain that often goes undetected (undiagnosed), sometimes for many years. Several studies have estimated that the SI joint is a source of pain in 15%-25% of patients with low back pain. Sometimes, fusions of the spine over many levels can put extra stress on the SI joint, causing it to hurt. Therefore, SI joint generated pain is starting to gain attention when diagnosing and treating low back pain.

What is the sacroiliac joint?

The SI joints (one on each side) are where the bottom of the spine (sacrum) meets the pelvis. The SI joints are the place where the weight from the upper body is transferred to the lower body. There is very little motion at this joint, but it can clearly see a lot of stress and cause pain.

Treatment options for sacroiliac joint pain

Several treatment options can be used for SI joint pain, these include:

Rest and/or medications

Physical therapy: this will include stretches specifically for maintaining joint flexibility, and exercises to strengthen the muscles that stabilize the SI joint.

Sacroiliac belt: this is used to stabilize the SI joint externally. The belt wraps around the hips and stabilizes the SI joint by squeezing the hips together.

Injections: a local anesthetic and an anti-inflammatory agent are injected directly into the SI joint. Pain relief, generally, is temporary but may last several months.

Radiofrequency denervation: this damages/deactivates the nerves that transmit sensation from the SI joint.

Minimally-invasive, image-guided fusion of the SI joint

Who needs sacroiliac joint fusion?

The SI joint often responds well to non-invasive therapies (e.g., PT or SI belt). For SI pain that doesn’t respond to these therapies, or for pain that worsens over time, an SI joint injection should be considered.

For those who don’t respond to non-surgical treatment options, surgical options should be considered. In fact, several scientific studies have shown that there is a subset of patients with SI joint dysfunction that are not helped by non-surgical therapies.

What is sacroiliac joint fusion?

In fusion surgery (also called arthrodesis) two bones are fused together to form a single piece of bone tissue. When fusion surgery is done to a joint, the two bones of the joint are fused together and the joint no longer exists. The goal of the procedure is to reduce pain by eliminating the motion of the joint.

Thus, in the case of SI joint fusion, the two bones of the SI joint are fused together to form a single, solid bone. This can reduce pain while there is no loss of motion, since the SI joint does not move.

A bone grafting material is used to stimulate the fusion process. The bone graft will be placed in the space between the two bones of the SI joint. There are a range of bone grafting materials that a surgeon can use.

How is sacroiliac joint fusion performed?

  • SI joint fusion takes about an hour and is performed with the patient under anesthesia.The patient is placed face down and a small incision is made above the SI joint (on the side of the buttocks).
  • The skin, muscles and other tissues are retracted (gently moved) to allow the surgeon access to the SI joint.
  • The interior surface of the joint is prepared by removing the cartilage lining.
  • Hardware (screws, plates and/or cages) and the bone graft are placed in the joint.)
  • The retracted tissues are released and the incision site sutured shut.

Causes of sacroiliac joint pain?

  • Sacroiliac joint pain may be due to conditions within the joint resulting from:
  • Traumatic injury to the SI joint from a sudden impact (e.g., fall or accident)
  • Arthritis of the SI joint
  • Traumatic birth
  • Pregnancy that results in an altered gait
  • Previous lumbar spine surgery
  • Infection of the SI joint (this is a rare condition)

What happens after sacroiliac joint fusion surgery?

After surgery, the patient is moved to an intensive care unit (ICU) for close monitoring of their vital signs. They will remain in the hospital for a period time; the duration of the postoperative stay can vary.

After discharge, the patient will have several follow-up visits with their surgeon to assess their progress. The patient will also receive some physical therapy.

The fusion process takes several months for the two bones to form a single, solid piece of bone; however, a patient’s comfort levels often improve before the fusion is solid. Their surgeon will advise them when it is appropriate to resume their normal daily activities. Return to work will depend on the patient’s postsurgical progress.

This material is intended to give the patient an overview of surgical procedures and treatments and is not intended to replace the advice and guidance of a physician. Always consult with your doctor about the particular risks and benefits of your treatment.

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