When you’re trying to sort out sacroiliac joint pain vs. sciatica, start with where it hurts. SI joint pain usually stays in the low back and buttock, sometimes reaching the back of the thigh. Sciatic nerve pain usually shoots below the knee and often into the calf or foot.
A 2013 review in Expert Review of Neurotherapeutics by Cohen and colleagues found the SI joint responsible for roughly 15% to 30% of chronic low back pain that doesn’t travel down the leg like a pinched nerve. Dr. Woska pins down the source of your pain before recommending any treatment.
How Can You Tell Sacroiliac Joint Pain From Sciatica?
You can tell sacroiliac joint pain from sciatica by noticing where the pain sits, what it feels like, and which movements set it off. Your SI joints connect your spine to your pelvis near the two dimples in your lower back. The sciatic nerve runs down the back of each leg. A sore joint acts like a stiff hinge. An irritated nerve behaves more like a frayed wire, sending pain along its length.
Usually on one side of the low back and deep in the buttock is where SI joint pain is felt. It sometimes spreads into the groin or back of the thigh but rarely passes the knee. Sciatica pain typically shows up often past the knee into the calf or foot.
SI joint pain usually feels like a deep ache, stiffness, or a sharp catch when you shift your weight. Sciatic nerve pain tends to burn, shoot, or feel electric, often with numbness, tingling, or weakness in the leg or foot.
When you get up from a chair, climb stairs, roll over in bed, or stand on one leg is often when SI joint pain flares. Sciatica tends to worsen when you bend forward, cough, sneeze, or strain. Sitting makes it more difficult to determine because it can aggravate either one, and SI joint pain when sitting is especially common if you lean onto one side.
Why Do SI Joint Pain and Sciatica Get Mistaken for Each Other?
If you’ve been treated for sciatica and still hurt, you are far from alone. The pain from both conditions live in the buttock. Sacroiliac joint pain can travel into the back of the thigh, much like the early path of the sciatic nerve, and some people have both problems at once. When the first explanation sounds right, months can pass with treatment aimed at a disc or nerve before anyone looks closely at the joint.
An MRI is a still picture taken while you lie flat, and it does its best work showing discs and nerves. Just because an MRI is normal doesn’t mean that nothing is wrong. SI joint trouble often appears only when the joint is working, as you stand, step, or shift your weight. Think of a photo of a parked car. It can show the frame is intact, but it won’t reveal the squeaky suspension that only acts up on the road. Disc bulges also appear on the MRIs of many people with no back pain, which can steer attention away from the joint.
How Does a Spine Specialist Find the Real Source of Your Pain?
A spine specialist finds the real source of your pain by gathering several kinds of evidence and looking for where they align.
Dr. Woska uses provocation tests, which press gently through the pelvis to reproduce your familiar pain, along with leg-raise tests that show whether the sciatic nerve is irritated. A consistent pattern across several tests carries far more weight than any single result.
When a nerve may be involved, electrodiagnostic testing (EMG) measures how well your nerves and muscles are communicating, and Dr. Woska interprets those results personally. Imaging is added when it can answer a specific question.
An SI joint injection places numbing medicine directly inside the joint. If your usual pain drops noticeably in the first few hours, the joint is confirmed as the source. The steroid in the injection takes several days to build, so a brief return of pain in between is normal and does not mean the test failed.
What Treatment Comes Next Once the Source Is Confirmed?
Once the source is known, most patients have nonsurgical options matched to their diagnosis.
Treatment for Confirmed SI Joint Pain
The injection inside the joint can bring relief on its own. If that relief fades, diagnostic blocks numb the nerves outside the joint that carry its pain. When they prove to be the right target, radiofrequency ablation quiets those nerves for longer-lasting relief. Minimally invasive SI joint fusion remains an option if pain persists.
Treatment for Confirmed Sciatic Nerve Pain
An epidural steroid injection calms the irritated nerve root. If a herniated disc is pressing on the nerve and conservative care hasn’t helped, discectomy may be considered. Spinal cord stimulation offers another path for nerve pain that persists.
Get a Clear Answer About Sacroiliac Joint Pain vs. Sciatica in Lakewood and Shrewsbury, NJ
If you’re unsure what doctor to see for sciatica or SI joint pain, start with a spine and pain specialist who can identify where the pain begins. Patients across Monmouth and Ocean County come to Dr. Woska when they want a straight answer about sacroiliac joint pain vs. sciatica and one plan built on a confirmed source.
Call (732) 584-2400 or request an appointment to schedule a consultation with Dr. Woska at our Lakewood or Shrewsbury office.
