For SI joint pain, start with your primary care doctor or a physiatrist (physical medicine and rehabilitation specialist). Either can evaluate your symptoms, run initial tests, and refer you to a more specialized provider if needed. The right specialist from there depends on what’s causing the pain and how long you’ve had it.
Start With Your Primary Care Doctor
Your primary care physician is a reasonable first stop because SI joint pain often overlaps with other conditions. About 84% of patients with lower lumbar disc herniations also show restricted SI joint movement, and disc problems at the L5-S1 level are especially likely to cause SI joint tenderness. Your doctor needs to sort out whether the SI joint itself is the problem or whether something else, like a herniated disc or hip issue, is referring pain to that area.
During the visit, your doctor will likely perform a series of hands-on provocation tests: compression, distraction, thigh thrust, sacral thrust, Gaenslen’s test, and the FABER (Patrick’s) test. No single test is reliable on its own, but when three or more come back positive, the combination has about 91% sensitivity and 78% specificity for SI joint dysfunction. If your doctor suspects the SI joint, they may start you on anti-inflammatory medications and refer you to physical therapy or a specialist.
Physiatrist: The Non-Surgical Specialist
A physiatrist specializes in restoring function and relieving pain without surgery. For many people with SI joint pain, this is the most useful specialist to see. Physiatrists focus on conservative, individualized treatment plans that combine physical therapy, targeted exercises, manual therapy, and when appropriate, injections. Their goal is to get you back to daily activities and work with minimal downtime and without opioids.
Physiatrists also perform or order diagnostic SI joint injections, which are the gold standard for confirming the SI joint as the source of your pain. During this procedure, a numbing agent is injected directly into the joint under imaging guidance. If you experience at least 75% pain relief while doing movements that previously hurt, the SI joint is confirmed as the pain generator. This step is critical because imaging alone, whether X-ray or MRI, often can’t definitively prove SI joint pain.
Physical Therapist: Your Day-to-Day Recovery
Physical therapy is one of the most effective treatments for SI joint dysfunction, and a therapist experienced with pelvic and spinal conditions will be central to your recovery regardless of which doctor you see. Programs that combine joint manipulation with targeted strengthening exercises show the strongest results. In one study, pain scores dropped from roughly 5.8 out of 10 to 1.3 after a combined manipulation and exercise program, with patients also regaining normal pelvic alignment.
Exercise-focused therapy on its own also works. Studies show patients completing structured exercise programs becoming pain-free at discharge, with previously positive provocation tests turning negative at follow-up. Manipulation alone, whether performed manually by a physical therapist or chiropractor, has produced significant pain and disability improvements within one to three weeks. Kinesio taping, on the other hand, performed no better than placebo tape in controlled studies, so don’t count on it as a standalone treatment.
Pain Management Specialist: For Persistent Pain
If conservative treatment hasn’t worked after several months, an interventional pain management specialist can offer procedures that go a step beyond physical therapy and medication. These doctors, often anesthesiologists or physiatrists with additional training, perform nerve blocks and radiofrequency ablation (RFA), a procedure that uses heat to disrupt the nerve signals carrying pain from your SI joint to your brain.
RFA provides meaningful but temporary relief. Patients typically experience around 47 to 48% pain improvement lasting about four to five months. Pulsed radiofrequency, a slightly different technique, shows more promising durability: in one study, nearly 87% of patients still had at least 50% pain reduction six months after the procedure. Keep in mind that steroid injections into the joint are limited to a few times per year because repeated doses can weaken nearby bone and tendons.
Rheumatologist: When Inflammation Is the Cause
Not all SI joint pain is mechanical. If your pain started gradually before age 45, feels worst in the morning with stiffness lasting more than 30 minutes, and improves with exercise rather than rest, you may have an inflammatory condition called axial spondyloarthritis (which includes ankylosing spondylitis). This requires a rheumatologist, not an orthopedic surgeon or physiatrist, because the treatment involves managing your immune system rather than addressing joint mechanics.
You should ask for a rheumatology referral if you have any of these additional features alongside chronic back pain that started before 45: a family history of spondyloarthritis, positive HLA-B27 blood test, elevated inflammation markers, eye inflammation (uveitis), inflammatory bowel disease, or imaging showing sacroiliitis. Early referral matters here because prompt treatment significantly improves long-term outcomes and can slow joint damage.
Orthopedic Surgeon: When Surgery Becomes an Option
An orthopedic surgeon enters the picture only after conservative treatments, physical therapy, and less invasive procedures have failed to provide lasting relief. Surgery for SI joint pain means fusion, where the sacrum and ilium are joined with titanium implants so the joint can no longer move and generate pain.
Modern minimally invasive SI joint fusion has largely replaced older open surgical techniques, which involved large incisions, significant blood loss, and long recoveries. The minimally invasive version uses small incisions and triangular titanium implants placed through the ilium into the sacrum. At 12 months, fusion rates reach about 88%, and pain scores typically drop by more than half. In one prospective study, 87% of patients were satisfied with the results at one year, and 91% said they would have the procedure again. By two years, over 80% of patients had achieved clinically meaningful pain improvement, and opioid use dropped from 76% to 55%.
The revision rate is low, with only about 3 out of every 100 patients needing a second procedure within two years. Still, surgery is considered a last resort. Most guidelines require that you’ve tried and failed physical therapy, medications, and at least one round of diagnostic or therapeutic injections before fusion is recommended.
Choosing Your Path
Your starting point depends on your situation. If you have new or recent SI joint pain, your primary care doctor can handle the initial workup and get you into physical therapy. If you’ve been dealing with it for months and want a specialist who can manage everything short of surgery, see a physiatrist. If your pain started young and has inflammatory features, go straight to a rheumatologist. And if you’ve exhausted conservative options, an orthopedic surgeon or neurosurgeon experienced in SI joint fusion is the next step.
One practical consideration: many insurance plans require a referral from your primary care doctor before covering specialist visits. Even if yours doesn’t, starting with a generalist who can order baseline imaging and blood work saves time by giving the specialist something to work with at your first appointment.