Sacroiliac Joint Fusion
Minimally Invasive Sacroiliac Joint Fusion for SI Joint Pain in New Jersey.
The sacroiliac joint is one of the most commonly overlooked sources of chronic lower back and buttock pain in adults. It sits at the junction between the sacrum — the triangular bone at the base of the spine — and the ilium, which is the large wing-shaped bone that forms the back of the pelvis on each side. The two sacroiliac joints, one on each side, are responsible for transferring the load of the upper body to the pelvis and legs. They are reinforced by some of the strongest ligaments in the body, and under normal circumstances, they move only minimally with each step.
When the sacroiliac joint becomes inflamed, damaged, or hypermobile due to injury, pregnancy, prior lumbar fusion, arthritis, or degenerative changes, it can produce pain that is remarkably difficult for patients and clinicians to distinguish from lumbar disc disease or sciatica. The pain is typically felt in the lower back just above the buttock on one side, and it may radiate into the buttock, hip, groin, or even the thigh. Because the symptoms so closely resemble those of lumbar pathology, SI joint dysfunction is frequently missed or misattributed for months or years before the correct diagnosis is made.
Sacroiliac joint fusion is a minimally invasive surgical procedure that stabilizes the painful SI joint by placing implants across it, allowing the sacrum and ilium to fuse together over time and eliminating the painful micromotion at the joint. It is a highly effective treatment for patients with
confirmed SI joint dysfunction that has not responded to conservative management, and the minimally invasive technique used today means that recovery is far faster than many patients expect.
Rishi N. Sheth, MD performs sacroiliac joint fusion at Spine Care New Jersey using a minimally invasive posterior approach, giving patients in New Jersey a surgical option for SI joint dysfunction from a fellowship-trained spine neurosurgeon who takes the time to make sure the diagnosis is correct before any surgical recommendation is made.
Getting the Diagnosis Right Is the Most Important Step.
Sacroiliac joint dysfunction is one of those conditions where accurate diagnosis is the real challenge. The symptoms overlap significantly with lumbar disc disease, facet joint arthritis, hip pathology, and piriformis syndrome — all of which can produce lower back and buttock pain. Without a systematic diagnostic process, it is easy to pursue the wrong treatment for months or years.
The clinical evaluation of suspected SI joint dysfunction begins with a careful history and physical examination. Patients with SI joint pain often point to an area just below and to one side of the lower back, over the posterior superior iliac spine, as the primary location of their pain. Specific provocative maneuvers — physical examination tests that stress the SI joint by applying pressure or distraction forces across it — can reproduce the patient's typical pain when the SI joint is the source.
Imaging including X-rays, CT, and MRI of the sacroiliac joints may show degenerative changes, erosions, or asymmetric changes that suggest SI joint pathology, though imaging findings do not always correlate perfectly with symptoms.
The diagnostic gold standard for confirming SI joint dysfunction is a fluoroscopically guided SI joint injection. Under live X-ray guidance, a small amount of local anesthetic is injected directly into the SI joint space. If this injection produces significant, temporary relief of the patient's typical pain, it confirms that the SI joint is the primary pain generator. The degree and duration of pain relief from a diagnostic injection directly informs whether SI joint fusion is likely to be beneficial.
Rishi N. Sheth, MD insists on confirmed diagnostic injection evidence before recommending SI joint fusion. Operating on a joint that has not been confirmed as the pain source through diagnostic injection is one of the most reliable ways to produce a failed outcome — and it is an error that careful diagnosis prevents.
The Patient Profile That Makes SI Joint Fusion the Right Next Step.
Sacroiliac joint fusion is appropriate for a specific and well-defined patient population. The criteria for candidacy are clear, and meeting all of them is what makes the difference between an excellent surgical outcome and an operation that fails to provide relief.
The ideal SI joint fusion candidate has chronic lower back and buttock pain of at least six months duration that has been localized to the sacroiliac joint through clinical examination and physical testing. They have undergone a diagnostic SI joint injection that produced significant temporary relief confirming the joint as the pain source. Conservative treatment including physical therapy, anti-inflammatory medications, and at least one or two SI joint steroid injections has been tried without producing lasting benefit. And imaging confirms degenerative changes or structural abnormality at the SI joint consistent with the clinical presentation.
There are specific patient populations for whom SI joint dysfunction is particularly common. Women who have undergone multiple pregnancies, during which the ligamentous laxity of pregnancy can alter SI joint mechanics, are frequently affected. Patients who have previously undergone lumbar spinal fusion are at elevated risk for developing SI joint dysfunction, because fusing lumbar segments transfers increased mechanical stress to the SI joint below. Patients with prior pelvic trauma or sacral fractures may develop post-traumatic SI joint degeneration. And patients with inflammatory arthritis conditions including ankylosing spondylitis can develop SI joint involvement as part of their systemic disease.
How Minimally Invasive SI Joint Fusion Works and What Recovery Looks Like
The Procedure
Modern sacroiliac joint fusion is performed through a minimally invasive approach that would be unrecognizable to patients who imagine traditional open joint surgery. The procedure is performed under general anesthesia with the patient positioned face down. Under fluoroscopic guidance — continuous real-time X-ray imaging — Rishi N. Sheth, MD makes a small incision of approximately two to three centimeters over the back of the hip on the affected side.
Through this incision, a series of small implants — typically titanium or porous coated devices designed to promote bone ingrowth across the joint — are placed across the sacroiliac joint from the ilium into the sacrum under imaging guidance. The precise trajectory of these implants is planned to achieve maximum purchase across the joint, with the bone ingrowth surface of the implants bridging the joint space and providing the biological substrate for fusion to occur over the following months.
The procedure typically takes between 30 and 60 minutes and is performed as an outpatient procedure or with an overnight hospital stay. The small incision, the avoidance of major muscle disruption, and the minimally invasive nature of the implant placement mean that the operative trauma is minimal compared to open joint surgery.
Recovery Timeline
Recovery from minimally invasive SI joint fusion is faster than many patients expect given that a joint is being surgically stabilized. The small incision heals quickly, and the absence of significant muscle disruption means postoperative pain is manageable from the outset.
In the first two weeks, patients are typically on protected weight bearing with a walker or cane, allowing some load through the fused side while the early healing process begins. Most patients transition to full weight bearing without assistive devices within two to four weeks as pain allows.
Return to sedentary desk work typically occurs within two to four weeks. More physically demanding work and activities involving heavy lifting or prolonged standing require six to twelve weeks. Physical therapy focusing on pelvic stability, gait training, and progressive return to full activity typically begins at four to six weeks after surgery.
The full biological fusion process takes three to six months to complete, which is when most patients experience the maximum benefit from the procedure. Many patients notice progressive improvement in their SI joint pain throughout the first six months as the implants integrate and the joint stabilizes further.
Accurate Diagnosis First. Surgical Precision Second.
SI joint fusion is a procedure where the quality of the outcome depends as much on patient selection and diagnostic accuracy as it does on surgical technique. A well-executed SI joint fusion in a patient who does not truly have SI joint dysfunction as their primary pain source will not relieve their pain. This is why Dr. Sheth's commitment to confirmed diagnostic injection before surgical recommendation is not optional — it is the foundation of good outcomes.
Patients who come to Spine Care New Jersey with a suspected SI joint diagnosis receive a thorough evaluation that takes the full clinical picture into account. Dr. Sheth reviews all available lumbar spine imaging to rule out concurrent lumbar pathology, evaluates the hip and pelvis for alternative pain generators, and ensures that the pattern of pain and the physical examination findings are consistent with SI joint dysfunction before proceeding to diagnostic injection.
When the diagnosis is confirmed and conservative treatment has genuinely been exhausted, Rishi N. Sheth, MD performs SI joint fusion using a meticulous minimally invasive technique developed through his fellowship training in spine surgery and his broader experience with minimally invasive procedures across the full spectrum of spinal pathology. His approach to SI joint fusion reflects the same principles he applies to every procedure he performs — the smallest effective surgical footprint, imaging guidance throughout, and personal involvement in every step of the patient's care from initial evaluation through final follow-up.
Common Questions About Sacroiliac Joint Fusion at Spine Care New Jersey.
Sacroiliac joint fusion is a minimally invasive procedure that stabilizes a painful, dysfunctional SI joint by placing small implants across it, allowing the sacrum and ilium to fuse together over time. It treats chronic lower back and buttock pain caused by SI joint degeneration, hypermobility, or post-traumatic dysfunction that has not responded to conservative care. Confirmation through diagnostic SI joint injection is required before surgery is recommended. Rishi N. Sheth, MD performs minimally invasive SI joint fusion at Spine Care New Jersey in New Jersey.
Most patients go home the same day or the following morning after minimally invasive SI joint fusion. Protected weight bearing with a walker or cane continues for two to four weeks. Return to desk work occurs within two to four weeks. More demanding physical activity requires six to twelve weeks. Physical therapy begins at four to six weeks. Most patients experience progressive improvement over three to six months as the implants integrate and the joint stabilizes. Full biological fusion is confirmed at three to six months on follow-up imaging.
Through a small two to three centimeter incision over the back of the hip, titanium implants are placed across the sacroiliac joint under fluoroscopic X-ray guidance. The implants bridge the joint space and promote bone ingrowth between the sacrum and ilium, stabilizing the joint and eliminating the painful micromotion driving the patient’s symptoms. The procedure takes 30 to 60 minutes, involves no major muscle disruption, and is typically performed as an outpatient procedure. Rishi N. Sheth, MD uses imaging guidance throughout to ensure precise implant placement.
Spine Care New Jersey in northern New Jersey is led by Rishi N. Sheth, MD, a board-certified spine neurosurgeon performing minimally invasive sacroiliac joint fusion for confirmed SI joint dysfunction. Dr. Sheth takes a rigorous diagnostic approach, requiring confirmed diagnostic injection evidence before recommending surgery, and performs the full evaluation and procedure personally. New patients throughout New Jersey can book a consultation or request a free MRI review at spinecarenj.com.
SI joint pain typically presents as pain in the lower back just above one buttock, often radiating into the buttock, hip, or thigh, without the classic calf or foot radiation of lumbar nerve root compression. Physical examination provocative tests that stress the SI joint can reproduce the pain when the joint is the source. The definitive confirmation is a fluoroscopically guided diagnostic SI joint injection — if temporary anesthetic injected into the joint significantly relieves the typical pain, the SI joint is confirmed as the primary pain generator. Rishi N. Sheth, MD performs this complete diagnostic evaluation before any surgical recommendation.