Mechanical/Iliac Causes

• Trauma: Falls, motor‑vehicle accidents, or sports injuries that jar the pelvis.
• Pregnancy: Hormonal relaxin loosens pelvic ligaments, and the growing uterus shifts the center of gravity.
• Leg length discrepancy or abnormal gait patterns that place uneven stress on one side of the joint.
• Degenerative changes: Osteoarthritis of the SI joint with age.
• Previous lumbar spine surgery or fusion that alters load distribution.

Inflammatory Causes

• Ankylosing spondylitis (AS) – a type of spondyloarthritis that frequently begins in the SI joint.
• Psoriatic arthritis, reactive arthritis, inflammatory bowel disease‑associated arthritis – all can involve the SI joint.
• Infection (septic sacroiliitis): Rare, but can occur after bacteremia, especially in immunocompromised patients.

Risk Factors

• Female sex (due to hormonal and pelvic anatomy differences).
• Age 30‑55 years for mechanical forms; younger age for inflammatory forms.
• History of lower‑back or hip injury.
• High‑impact occupations (e.g., construction, nursing) that require frequent lifting or prolonged standing.
• Obesity – excess body weight increases compressive forces on the SI joint.
• Family history of spondyloarthritis or HLA‑B27 positivity.

Diagnosis

Diagnosing SI joint dysfunction is challenging because pain overlaps with lumbar disc disease, hip pathology, and piriformis syndrome. A systematic approach that combines history, physical examination, and targeted imaging yields the most accurate diagnosis.

Clinical Evaluation

• Detailed history – onset, aggravating/relieving factors, pregnancy, trauma, systemic symptoms.
• Physical examination maneuvers – three or more of the following positive findings strongly suggest SI involvement:
  • FABER (Flexion‑Abduction‑External Rotation) test.
  • Gaenslen’s test.
  • Thigh thrust test.
  • Compression test (patient lies on painful side).
  • Distraction test (pulling the pelvis apart).
• Assessment of gait, leg length, and lumbar spine mobility to rule out other sources.

Imaging & Diagnostic Tests

1. Plain Radiographs (X‑ray): Useful to detect advanced arthritis, joint space narrowing, or sclerosis but often normal in early disease.
2. Computed Tomography (CT): Provides detailed bone anatomy; helpful when surgical planning is considered.
3. Magnetic Resonance Imaging (MRI): Best for detecting inflammation, bone marrow edema, or infection. MRI is the gold standard for inflammatory sacroiliitis (American College of Rheumatology criteria).
4. Sacroiliac Joint Injection with Fluoroscopy or CT guidance: Both a diagnostic and therapeutic tool. Temporary pain relief after a local anesthetic injection strongly supports the SI joint as the pain generator.
5. Blood Tests (when inflammatory cause suspected): ESR, CRP, HLA‑B27, rheumatoid factor, ANA – help identify systemic rheumatologic disease.

Differential Diagnosis

Clinicians must consider lumbar disc herniation, facet joint arthritis, piriformis syndrome, hip osteoarthritis, and referred pain from abdominal or gynecologic conditions.

Treatment Options

Treatment follows a step‑wise algorithm: start with the least invasive measures and progress to interventional or surgical options if pain persists beyond 6–12 weeks.

1. Medications

• Non‑steroidal anti‑inflammatory drugs (NSAIDs): Ibuprofen, naproxen, or diclofenac reduce pain and inflammation. Use the lowest effective dose for the shortest duration to limit GI and cardiovascular risks (Mayo Clinic, 2023).
• Acetaminophen: Helpful for mild pain, especially when NSAIDs are contraindicated.
• Muscle relaxants: E.g., cyclobenzaprine for nighttime spasm relief.
• Prescription analgesics: Short courses of opioids may be considered for severe breakthrough pain but should be strictly time‑limited.
• Disease‑modifying antirheumatic drugs (DMARDs) & biologics: For inflammatory sacroiliitis (e.g., TNF‑α inhibitors such as etanercept, adalimumab) per ACR guidelines.

2. Physical Therapy & Rehabilitation

• Core stabilization exercises: Strengthening transversus abdominis, multifidus, and gluteal muscles reduces shear forces on the SI joint.
• Pelvic‑tilt and hip‑strengthening routines: Emphasize gluteus medius, hamstring, and quadriceps control.
• Manual therapy: Mobilization, soft‑tissue massage, and joint thrust techniques administered by a trained therapist can improve mobility and relieve pain.
• Education on proper body mechanics: Teaching safe lifting, sitting, and sleeping postures.

3. Interventional Procedures

• Fluoroscopic‑guided SI joint injection: A mixture of corticosteroid (e.g., methylprednisolone) and local anesthetic provides pain relief for several weeks to months.
• Radiofrequency (RF) ablation: Chronic pain after failed injections may respond to RF denervation of the lateral branches supplying the joint.
• SI joint fusion (minimally invasive): Devices such as triangular titanium implants or screw fixation are performed when conservative care fails after 6–12 months. Studies show > 80 % patient‑reported improvement and high fusion rates (Cleveland Clinic, 2022).

4. Lifestyle & Self‑Management

• Weight management – losing even 5–10 % body weight can markedly lower joint load.
• Regular low‑impact aerobic activity (walking, swimming, cycling) to maintain cardiovascular health without over‑loading the SI joint.
• Heat or cold therapy: 15‑20 minutes before activity (heat) or after activity (cold) to modulate pain.
• Use of supportive cushions (donut or wedge) for sitting, and a firm mattress or a pillow under the knees when lying on the back.

Living with Iliitis (Sacroiliac Joint Dysfunction)

Chronic pain can be exhausting, but a proactive plan can help you stay active and maintain quality of life.

Daily Management Tips

• Morning routine: Gentle stretching (cat‑cow, pelvic tilts) for 5‑10 minutes before getting out of bed.
• Work ergonomics: Use a chair with lumbar support, keep feet flat on the floor, and alternate sitting and standing every 30 minutes.
• Footwear: Choose supportive shoes; orthotics can correct subtle leg‑length discrepancies.
• Activity pacing: Break tasks into shorter intervals; avoid prolonged standing or walking without breaks.
• Mind‑body techniques: Deep breathing, mindfulness meditation, or guided imagery can lower pain perception and stress.
• Tracking: Keep a pain diary noting activities, intensity (0‑10 scale), and medication use; share this with your provider to adjust treatment.

Returning to Exercise

1. Start with a 5‑minute warm‑up (march in place, gentle arm circles).
2. Incorporate core‑stability workouts twice weekly (e.g., bird‑dog, side‑plank).
3. Progress to low‑impact cardio (Elliptical, swimming) for 20‑30 minutes, 3‑4 times per week.
4. Gradually re‑introduce strength training for hips and glutes (bodyweight squats, resistance band abductions).
5. Stop any exercise that provokes sharp SI pain beyond mild fatigue.

Prevention

While you cannot always prevent an acute injury, many strategies lower the risk of developing SI joint dysfunction.

• Maintain a healthy weight – excess weight increases compressive forces on the pelvis.
• Strengthen core and gluteal muscles – a strong muscular “corset” supports the SI joint.
• Practice proper lifting techniques – bend at the knees, keep the load close to the body.
• Address leg‑length discrepancy early – orthotic shoe inserts can balance forces.
• Stay active – regular aerobic and flexibility exercises preserve joint mobility.
• Pregnancy care – prenatal physiotherapy focusing on pelvic stability can reduce post‑partum SI pain.

Complications

If left untreated or inadequately managed, iliitis may lead to:

• Chronic pain syndrome – central sensitization can make pain persist even after the joint heals.
• Progressive joint degeneration (ankylosing spondylitis may cause the joint to fuse, limiting motion).
• Altered gait and secondary musculoskeletal problems – hip, knee, or lumbar spine pain due to compensatory mechanics.
• Reduced functional capacity – difficulty performing work‑related tasks, leading to absenteeism.
• Psychological impact – depression, anxiety, and sleep disturbance are common in chronic low‑back pain populations (CDC, 2021).

When to Seek Emergency Care

Sources: Mayo Clinic. “Sacroiliac joint pain.” 2023; CDC. “Chronic pain data.” 2021; NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. “Sacroiliac Joint Dysfunction.” 2022; American College of Rheumatology. “Diagnosis of Ankylosing Spondylitis.” 2022; Cleveland Clinic. “Minimally invasive SI joint fusion outcomes.” 2022; Peer‑reviewed articles from Spine and Journal of Orthopaedic Research.