Treatment pathway · Sacroiliac joint
SI Joint Treatment
Treatment for sacroiliac joint pain is a ladder rather than a single procedure, and the first rungs are diagnostic as well as therapeutic, because confirming the joint is the source matters more here than in most spine conditions.
Who this is for
Fusion is considered only after the diagnosis has been confirmed by examination and diagnostic injection, after the lumbar spine and hip have been adequately excluded, and after the earlier rungs of the ladder have been genuinely tried.
Why this page is a ladder
Most treatment pages on this site describe one operation. This one describes a sequence, because for the sacroiliac joint the order of the steps is a substantial part of the treatment.
The reason is diagnostic. SI joint pain is mistaken for lumbar pain routinely, the examination tests are individually unreliable, and imaging frequently looks normal even when the joint is the problem. So the early steps do double duty: they treat, and they test.
Step one: targeted therapy and activity modification
Physical therapy aimed specifically at the pelvis, the gluteal musculature and the hip. This is not the same as a generic lumbar programme, and patients who have already done months of lumbar-focused therapy without benefit have not necessarily had this.
Alongside it, identifying and modifying the movements that reliably provoke symptoms. For this joint those tend to be asymmetric loads: standing on one leg, climbing stairs, getting in and out of a car, rolling over in bed.
Some patients benefit from a pelvic belt, which offers a small amount of external support and is worth a trial because it is cheap and reversible.
A meaningful number of patients do not need to go further than this step.
Step two: image-guided injection
Local anaesthetic, usually with a steroid, placed into the joint under imaging guidance so that the position of the needle is confirmed rather than assumed. That confirmation is the point: an injection that missed the joint tells you nothing.
Two things come out of it.
Therapeutically, it can settle an inflamed joint and give a patient enough relief to engage properly with therapy.
Diagnostically, and more importantly, the response is the single most useful piece of evidence available. Meaningful relief in the hours after the injection supports the joint being the source. Little or no relief argues against it, and argues for looking again at the lumbar spine and the hip.
Patients are often asked to keep a simple record of their pain over the hours following the injection, because that record is the test result.
Step three: fusion, for confirmed cases only
SI joint fusion places implants across the joint through a small lateral approach under imaging guidance, so that the joint stops moving in the way that provokes pain.
As spine operations go it is on the smaller end. The recovery is manageable and the approach is limited.
What makes it work is not the technique. It is the selection. The patients who do well are the ones whose diagnosis was confirmed by history, examination and injection response, in whom the lumbar spine and hip were properly excluded, and who had genuinely worked through the earlier steps.
The patients who do not do well are the ones whose pain was never coming from the joint. No surgical technique corrects for that, which is why the first two rungs of this ladder are not a formality.
After a lumbar fusion
Worth its own note. Fusing lumbar segments transfers load to the levels around them, and the sacroiliac joint sits directly below the bottom of the lumbar spine.
A patient whose original leg pain resolved after a lumbar fusion, and who months or years later developed new one-sided buttock pain, is describing a pattern that should be assessed specifically. It is frequently attributed to the original problem returning, and it frequently is not that.
Limitations and trade-offs
- Diagnosis matters more here than almost anywhere else on this site. Fusing a joint that was never the pain source treats the wrong problem, and the symptoms overlap heavily with lumbar and hip conditions.
- No single examination test is specific enough to rely on. Several positive tests in a patient whose history fits is meaningful; one is not.
- Imaging is frequently unremarkable in mechanical SI joint pain, so a normal MRI does not exclude the diagnosis and an abnormal one does not confirm it.
- Injection relief is often temporary. Its diagnostic value is at least as important as its therapeutic value.
- Fusion is a real operation with real risks: infection, bleeding, nerve irritation, implant-related problems, and incomplete relief.
- Some patients have pain from more than one source, and treating the SI joint may improve part of the picture rather than all of it. That should be discussed beforehand.
References
This page is for general education and is not medical advice. It does not create a doctor-patient relationship, and it cannot account for the specifics of your own spine. For guidance about your situation, see a qualified physician. If you think you are having a medical emergency, call 911 or go to the nearest emergency department rather than waiting for an appointment.
Common questions
- Why is the diagnostic step emphasised so heavily?
- Because the consequences of getting it wrong are concrete. SI joint symptoms overlap with lumbar and hip problems, most adult lumbar MRIs show something that can be blamed, and mechanical SI joint pain often looks normal on imaging. A patient who has an SI joint fused when the pain was coming from elsewhere has had an operation that could not have helped.
- What does a diagnostic injection involve?
- Local anaesthetic is placed into the joint under imaging guidance, so the needle position is confirmed rather than assumed. The relevant information is what happens over the following hours: meaningful temporary relief supports the joint being the source, and little or no relief argues against it.
- Does physical therapy actually help SI joint pain?
- It helps a substantial number of patients, provided it is aimed at the right thing. Generic lumbar programmes are frequently unhelpful here. Work directed at the pelvis, the gluteal musculature and the hip, together with modifying the specific movements that provoke symptoms, is what tends to make a difference.
- What does SI joint fusion involve?
- Implants are placed across the joint through a small lateral approach under imaging guidance, so that the joint stops moving in the way that provokes pain. It is a smaller operation than most spine fusions. The selection criteria are what make it work, not the technique.
- Can SI joint pain start after a lumbar fusion?
- Yes, and it is a recognised pattern. Fusing lumbar segments transfers load downward, and the sacroiliac joint sits immediately below. New one-sided buttock pain some time after a lumbar fusion is worth assessing specifically rather than attributing to the original problem.
Where to be seen
Consultations for si joint treatment are available at all eight Academy offices.
Not sure which is closest? See the areas we serve, or call (312) 313-1086.