A commonly missed source
The joint linking spine to pelvis causes buttock and leg pain that mimics disc and hip problems — and is frequently overlooked.
Diagnostics · Invasive
Diagnostic SI Joint Injection
A targeted injection into the sacroiliac joint to help determine whether it contributes to symptoms.
What it is
The joint most assessments skip
Where the spine meets the pelvis, the sacroiliac joint bears every step you take — yet its pain is routinely blamed on discs or hips. A selective diagnostic injection settles the question directly.
Numbing under guidance
Anaesthetic placed precisely into the SI joint under imaging guidance. Relief of your familiar pain while numb implicates the joint.
Temporary by design
The effect lasts hours. Like all diagnostic blocks, it answers a question; treatment of a confirmed SI source is planned separately.
Distinguishing neighbours
Because hip arthritis, facet pain and SI pain overlap, a selective block separates them when examination and scans cannot.
Invasive diagnostics are used only when the result will change the plan. Suitability is assessed individually.
Common questions
Things patients ask us
How do I know my pain is from the SI joint?
Typical clues are one-sided buttock pain, pain rising from a chair, and tenderness over the joint — but only a selective block confirms it.
Will it hurt?
The skin is numbed first. Most people feel brief pressure as the needle reaches the joint.
What must I disclose beforehand?
Blood thinners, infections, allergies, diabetes and pregnancy all matter. Bring a full medication list so the team can plan safely.
What happens after a positive result?
The team explains the options for a confirmed SI source, including what each involves and what it cannot achieve.
Start with your case.
Send your history and any imaging you already have. The ProSpine team will review your case and respond with the next steps.
Free · No obligation · Reviewed by the ProSpine team