Why is local anaesthetic used in a sacroiliac joint injection?

The sacroiliac joints connect the base of the spine with the pelvis. During an image-guided injection, local anaesthetic is placed into or close to the selected joint. If familiar pain eases during the anaesthetic window, that response can help the clinician interpret the joint's role alongside your examination and history. Relief may be temporary, and pain can have more than one source. Any additional medicine in the injection is used for a separate purpose and may not work immediately.

Give the clinic a complete medicine and health history, including blood thinners, allergies, diabetes, pregnancy, infection or recent illness. Ask whether you need a driver and how to record your symptoms. Keep the first activities gentle, because altered sensation may make it harder to judge strain. Write down what changes when you stand, walk, sit or climb stairs; this can make the follow-up assessment more useful.

Call the treating clinic for increasing pain, persistent leg weakness, fever, or warmth, swelling, redness or discharge at the injection site. Get urgent help for severe allergic symptoms, breathing difficulty, collapse, new bladder or bowel problems, or rapidly worsening weakness or numbness. Mild soreness can happen after an injection, but symptoms that intensify or fail to settle deserve clinical advice.

Is the injection inside the joint or beside it? What response are you looking for? How should I record relief and movement? When may I resume exercise? Which medicines or symptoms should I report before the appointment?