Fluoroscopy-Guided Sacroiliac Joint Injection: Step-by-Step Procedure Guide

Fluoroscopy-Guided Sacroiliac Joint Injection: Complete Step-by-Step Guide for SI Joint Pain Relief

Low back pain is one of the most common causes of disability worldwide, and the sacroiliac (SI) joint is responsible for approximately 15–30% of chronic lower back pain cases. A fluoroscopy-guided sacroiliac joint injection is a highly precise, minimally invasive procedure used both to diagnose and treat SI joint pain.

This guide explains the anatomy, indications, preparation, procedural steps, benefits, risks, recovery, and expected outcomes of fluoroscopy-guided SI joint injections in a clear step-by-step format.

What is the Sacroiliac (SI) Joint?

The sacroiliac joints are located where the sacrum connects with the iliac bones of the pelvis. These joints transfer body weight between the spine and lower limbs while acting as shock absorbers.

Common symptoms of SI joint dysfunction include:

• Pain in the lower back

• Buttock pain

• Hip or groin discomfort

• Pain while standing from sitting

• Pain during walking or climbing stairs

• Pain radiating to the thigh

The SI joint can become painful due to:

• Degenerative arthritis

• Trauma

• Pregnancy-related ligament laxity

• Post-spinal surgery biomechanical changes

• Inflammatory arthritis

• Repetitive strain injuries

What is a Fluoroscopy-Guided Sacroiliac Joint Injection?

A fluoroscopy-guided SI joint injection is an image-guided pain management procedure where a mixture of local anaesthetic and steroid medication is injected directly into the sacroiliac joint under real-time X-ray guidance.

Fluoroscopy improves accuracy and ensures precise needle placement inside the joint space.

The procedure may be:

1. Diagnostic SI Joint Injection

Used to confirm whether the SI joint is the actual source of pain.

2. Therapeutic SI Joint Injection

Used to reduce inflammation and provide pain relief.

Why is Fluoroscopy Important?

Fluoroscopy allows real-time visualisation of:

• Needle trajectory

• Joint anatomy

• Contrast spread

• Accurate intra-articular placement

Without imaging guidance, blind SI joint injections have significantly lower accuracy rates.

Benefits of fluoroscopy-guided injections include:

• Better diagnostic accuracy

• Improved treatment outcomes

• Reduced procedural complications

• Minimal tissue trauma

• Faster recovery

Indications for SI Joint Injection

Your pain specialist may recommend this procedure if you have:

• Chronic low back pain

• Buttock pain

• Sacroiliitis

• Suspected SI joint dysfunction

• Failed conservative treatment

• Pain after lumbar fusion surgery

• Inflammatory SI joint pain

• Pain aggravated by prolonged sitting or standing

Positive provocative SI joint tests may include:

• FABER test

• Gaenslen test

• Compression test

• Thigh thrust test

• Distraction test

Contraindications

The procedure may not be suitable for:

• Active infection

• Uncontrolled diabetes

• Severe bleeding disorders

• Allergy to contrast dye

• Pregnancy (relative contraindication)

• Uncontrolled hypertension

Pre-Procedure Preparation

Before the procedure:

Medical Evaluation

Your doctor reviews:

• Medical history

• Current medications

• Allergies

• Imaging studies

• Blood thinner usage

Medication Instructions

Certain anticoagulants may need temporary discontinuation under physician guidance.

Fasting

Some patients may be advised to avoid eating for 4–6 hours before the procedure if sedation is planned.

Consent

Risks, benefits, alternatives, and expected outcomes are discussed before obtaining informed consent.

Step-by-Step Fluoroscopy-Guided SI Joint Injection Procedure

Step 1: Patient Positioning

The patient lies prone (face down) on the fluoroscopy table.

A pillow may be placed under the abdomen to reduce lumbar lordosis and improve joint visualisation.

Step 2: Sterile Preparation

The lower back and buttock region are cleaned with an antiseptic solution and draped using sterile technique.

Step 3: Fluoroscopic Localisation

Using fluoroscopy, the physician identifies:

• Sacral ala

• Posterior SI joint line

• Inferior joint recess

Oblique fluoroscopic views are often used for optimal visualisation.

Step 4: Local Anaesthesia

The skin and subcutaneous tissues are infiltrated with local anaesthetic to minimise discomfort.

Patients may feel mild burning for a few seconds.

Step 5: Needle Placement

A spinal needle is advanced carefully toward the SI joint under continuous fluoroscopic guidance.

The target is usually the inferior one-third of the SI joint, where joint access is technically easier.

Step 6: Contrast Dye Injection

A small amount of contrast dye is injected to confirm:

• Intra-articular spread

• Correct needle placement

• Absence of vascular uptake

This is one of the most critical steps for procedural accuracy.

Step 7: Medication Injection

After confirmation, medication is injected into the joint.

Common injectables include:

• Local anesthetic

• Corticosteroid

• Combination therapy

The injection usually takes only a few seconds.

Step 8: Needle Removal

The needle is removed, and a small dressing is applied.

The patient is then shifted to the recovery area for observation.

How Long Does the Procedure Take?

The entire procedure typically takes:

• 10–20 minutes for the injection

• 30–60 minutes total, including recovery

Most patients go home the same day.

What Does the Injection Feel Like?

Patients may experience:

• Mild pressure

• Temporary buttock discomfort

• Brief burning sensation

• Reproduction of familiar pain during injection

These sensations are usually short-lived.

Recovery After SI Joint Injection

Most patients resume light activities within 24 hours.

Post-procedure recommendations include:

• Avoid strenuous activity for 24–48 hours

• Apply ice if soreness occurs

• Continue prescribed medications

• Monitor pain relief pattern

Pain relief may occur:

• Immediately after the local anaesthetic

• Gradually, over several days, from steroid action

How Successful Are SI Joint Injections?

Success rates vary depending on:

• Correct diagnosis

• Severity of degeneration

• Technique accuracy

• Associated spine disorders

Many patients experience:

• Reduced inflammation

• Improved mobility

• Better sitting tolerance

• Reduced need for oral medications

• Improved quality of life

If pain relief is temporary but significant, radiofrequency ablation of SI joint nerves may be considered.

Risks and Complications

Fluoroscopy-guided SI joint injections are generally very safe when performed by experienced pain physicians.

Possible risks include:

• Infection

• Bleeding

• Allergic reaction

• Temporary numbness

• Steroid-related side effects

• Increased soreness

• Rare nerve injury

Serious complications are uncommon.

Advantages of Fluoroscopy-Guided SI Joint Injection

High Accuracy

Real-time imaging improves needle precision.

Minimally Invasive

No surgery or stitches required.

Diagnostic Value

Helps confirm SI joint as the pain generator.

Therapeutic Relief

Reduces inflammation and pain.

Quick Recovery

Most patients return home the same day.

Frequently Asked Questions (FAQs)

Is SI Joint Injection Painful?

Most patients tolerate the procedure well with only mild temporary discomfort.

How Long Does Pain Relief Last?

Relief may last from weeks to several months, depending on the underlying condition.

Can SI Joint Pain Return?

Yes. Degenerative or inflammatory conditions may cause recurrence over time.

Is Fluoroscopy Safe?

Fluoroscopy uses low-dose radiation and is considered safe when performed appropriately.

Can Both SI Joints Be Injected Together?

Yes, bilateral SI joint injections may be performed when clinically indicated.

Who Should Perform SI Joint Injections?

For best outcomes, the procedure should be performed by an experienced interventional pain specialist trained in fluoroscopic spine and joint interventions.

Final Thoughts

Fluoroscopy-guided sacroiliac joint injection is one of the most effective minimally invasive procedures for diagnosing and treating SI joint pain. Accurate image-guided needle placement improves both safety and clinical outcomes.

If you suffer from chronic lower back or buttock pain that has not improved with medications or physiotherapy, an SI joint evaluation by an interventional pain specialist may help identify the true pain source and provide lasting relief.

At Samobathi Pain Clinic Kolkata, advanced fluoroscopy-guided pain procedures are performed using precision imaging techniques for accurate diagnosis and minimally invasive treatment of chronic pain conditions.

Book a consultation with an interventional pain specialist to determine whether SI joint injection is appropriate for your condition.

About the Author

Dr Debjyoti Dutta is a highly experienced interventional pain physician and educator specialising in minimally invasive pain management procedures, ultrasound-guided interventions, fluoroscopy-guided spine procedures, and regenerative pain therapies. He is actively involved in teaching pain medicine techniques through the Asian Pain Academy (APA), where he trains doctors in advanced interventional pain procedures and musculoskeletal ultrasound.

Dr Dutta has extensive expertise in the management of chronic back pain, sacroiliac joint pain, cervical and lumbar radicular pain, osteoarthritis, neuropathic pain, and sports-related musculoskeletal disorders. His clinical approach focuses on precision-guided procedures aimed at improving patient outcomes while minimising the need for surgery.

He is committed to advancing pain medicine education through workshops, hands-on cadaveric training programs, and evidence-based learning modules for healthcare professionals across India and beyond.

Through his educational content and clinical practice, Dr Debjyoti Dutta continues to promote safe, accurate, and patient-centred interventional pain management.