Is It Really Sciatica? Sacroiliac Joint Pain and Other Causes of Leg Pain That Mimic It

True Sciatica Versus Look-Alikes

True sciatica is pain caused by irritation of a nerve root or of the sciatic nerve itself, often with a shooting or burning pain below the knee, tingling, numbness or weakness. But the back, pelvis and hip can also refer pain into the buttock and thigh without any nerve being involved. This is sometimes called pseudo-sciatica or referred pain, and it is very common.

The distinction matters because the treatment differs. Stretching a nerve that is not the problem wastes time, and treating a joint when a nerve root is compressed misses the target.

The Most Common Look-Alikes

• Sacroiliac (SI) joint dysfunction — Pain over one side of the lower back and buttock, sometimes into the back of the thigh, worse with turning in bed, climbing stairs or standing on one leg.
• Lumbar facet joint irritation — Deep ache in the lower back and buttock, often worse leaning backward.
• Gluteal tendon or trigger-point pain — Tender spots in the buttock that reproduce an aching referral into the thigh.
• Hip joint problems — Groin or outer-hip pain, stiffness and pain with hip rotation. See hip pain treatment.
• Piriformis syndrome — A deep buttock muscle irritating the nerve. See piriformis syndrome.

Clues That Point Away From a Nerve Root

• Pain stays above the knee and has a dull, aching quality rather than a sharp shooting one.
• No pins and needles, numbness or weakness.
• Pain is reproduced by pressing on the SI joint or buttock, or by hip movements.
• Coughing and sneezing do not worsen the leg pain.

How Osteopathy Sorts It Out

An osteopathic assessment looks at the spine, pelvis and hips as one system. Typical steps include:

• A detailed history of what provokes and eases the pain.
• A neurological screen of strength, reflexes and sensation.
• Provocation tests for the SI joint, hip and lumbar spine.
• Palpation of the buttock muscles and surrounding tissues.

Treatment is then matched to the finding: gentle joint mobilisation for the pelvis, soft-tissue work for tight muscles, and guidance on movement and posture. When the nerve root itself is involved, the plan shifts accordingly, and we refer for medical review if needed.

Why a Combined View Helps

Sometimes more than one source is present, for example a stiff SI joint and a tight piriformis together. Our osteopaths and physiotherapists collaborate so that manual care and strengthening address the whole picture. Read also our guides on sciatica causes and disc versus piriformis causes.

Book a Sciatica Assessment at Réhabital

Our physiotherapists and osteopaths in Côte Saint-Luc work side by side to find what is actually irritating your sciatic nerve and build a plan around it. Book online or read more about sciatica treatment at Réhabital.