Sacroiliac Joint Dysfunction: Causes, Symptoms, & Treatments

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Experiencing sharp pain at the base of the spine radiating into the hip or thigh, especially during activities like climbing stairs or exiting a vehicle, may indicate sacroiliac (SI) joint dysfunction. The sacroiliac joints, located where the spine connects to the pelvis, play a critical role in stabilising and transferring weight between the upper body and the lower limbs. When these joints become dysfunctional, routine movements may provoke significant discomfort. This article outlines the anatomy, causes, symptoms, diagnosis, and treatment options for SI joint dysfunction.

What Is the Sacroiliac Joint?

Anatomically, the pelvis functions as a supportive base for the spinal column. The sacrum, a triangular bone at the base of the spine, articulates with the iliac bones on either side via the sacroiliac joints. These paired joints transmit mechanical loads from the torso to the lower extremities. While their range of motion is minimal, this limited movement is essential for shock absorption and postural stability.

Causes of Sacroiliac Joint Dysfunction

Primary Causes:

Trauma, such as falls or sports-related injuries, can displace or irritate the joint.
Degenerative changes associated with ageing may result in joint inflammation or stiffness.
During pregnancy, hormonal changes, particularly increased levels of relaxin, can lead to ligamentous laxity.

Risk Factors:

Female anatomy and hormonal fluctuations predispose women to a higher incidence.
Occupations involving prolonged standing or heavy lifting increase biomechanical stress.
Structural anomalies such as leg length discrepancy or scoliosis disrupt pelvic symmetry.

Symptoms of Sacroiliac Joint Dysfunction

Localised lower back pain, often unilateral, radiating to the buttock or posterior thigh
Stiffness or a sensation of joint locking, particularly in the morning
Pain exacerbated by prolonged sitting, standing, or stair climbing
Referred pain into the groin or upper legs

Diagnosis of Sacroiliac Joint Dysfunction

Accurate diagnosis requires a comprehensive clinical evaluation combined with appropriate diagnostic investigations. Because SI joint dysfunction can mimic other spinal or hip disorders, a systematic approach is essential.

Physical Examination:

Provocative tests such as the FABER (Flexion, Abduction, External Rotation) test, Gaenslen’s test, and compression manoeuvres are commonly used. The Fortin finger test, where the patient points to the exact site of pain, also supports the diagnosis. These tests have demonstrated diagnostic utility in several clinical studies.

Imaging Studies:

X-rays, MRI, Ultrasound scans, or CT scans are useful for ruling out conditions like sacral fractures, disc herniations, or sacroiliitis. However, these modalities often appear normal in mechanical dysfunction.

Diagnostic Injections:

Fluoroscopically guided intra-articular local anesthetic injections can confirm the SI joint as the pain source. A reduction in pain by at least 75% following injection is considered diagnostic. These are considered the gold standard in confirming SI joint pain.

Differentiating SI Joint Dysfunction from Sciatica

SI joint dysfunction can clinically resemble lumbar radiculopathy due to overlapping symptomatology. Sciatica typically arises from lumbar nerve root compression (e.g., due to a herniated disc), while SI joint dysfunction is musculoskeletal in origin. Precise diagnosis ensures that patients receive the most appropriate treatment.

Treatment Options for Sacroiliac Joint Dysfunction

Non-Invasive Interventions:

Physical therapy: Core stabilisation and muscle re-education exercises help support pelvic alignment. And remains the first-line intervention for SI joint pain.
NSAIDs: Useful in managing acute inflammation and pain flares.
SI belts and braces: Offer mechanical support during ambulation and reduce strain.
Corticosteroid injections: These provide rapid symptom relief and are often combined with physical therapy.

Invasive Interventions:

Radiofrequency ablation (RFA): By disrupting nerve conduction, RFA can offer pain relief for up to 12–18 months.
Surgical fusion: Reserved for patients with refractory pain who have failed at least 6 months of conservative therapy. Minimally invasive SI joint fusion has shown promising outcomes in chronic cases.

Individuals suffering from sacroiliac joint dysfunction symptoms may experience a reduction in their mobility and quality of life. Early recognition of these symptoms is crucial for timely intervention.

Sacroiliac Joint Injections

Sacroiliac joint injections involve the targeted administration of a local anaesthetic and/or corticosteroid into the SI joint to reduce inflammation and pain. These injections are performed under ultrasound guidance to ensure precise medication placement.

One key benefit of this treatment is that it provides rapid and effective pain relief, especially when other conservative measures have failed. The Sacroiliac joint injection not only helps reduce inflammation in the joint but also aids in improving mobility, thus enhancing patients’ quality of life.

Complementary Therapies:

Chiropractic manipulation may realign pelvic structures and relieve tension.
Acupuncture and dry needling target myofascial pain points to reduce muscular guarding.
Massage therapy helps improve circulation and reduce fascial restriction around the joint.

Prognosis and Long-Term Management

With appropriate treatment, many individuals experience significant symptom improvement within weeks. Long-term prognosis depends on underlying causes, compliance with rehabilitation, and ergonomic modifications. Early diagnosis and multidisciplinary care are key to preventing chronic pain syndromes.

Prevention and Lifestyle Strategies

Maintain proper lifting mechanics: Bend at the knees, not the waist.
Regular strengthening and stretching: Target the core, gluteal muscles, and hip flexors.
Maintain a healthy body weight to reduce biomechanical stress.
Use ergonomic workstations: Adjustable chairs and standing desks support pelvic alignment.
Break sedentary routines: Avoid sitting for extended periods without movement.

Common Questions We Hear From Patients

What is the root cause of SI joint dysfunction?

Common causes include trauma, degenerative changes, pregnancy-related ligament laxity, and biomechanical strain.

Can SI joint dysfunction cause hip pain?

Yes. Pain may radiate to the hip or groin area.

Is SI joint dysfunction curable?

While not always curable, most patients can achieve significant symptom control with appropriate treatment and lifestyle modifications.

What is the 'One Finger Test'?

A diagnostic tool in which the patient identifies a precise point of pain, often implicating the SI joint.

What conditions can mimic SI joint dysfunction?

Lumbar disc herniation, hip osteoarthritis, and sciatica can present with overlapping symptoms.

Conclusion

Although anatomically compact, the sacroiliac joints play a pivotal role in maintaining spinal and pelvic integrity. Accurate diagnosis followed by individualized treatment can significantly enhance quality of life. Persistent lower back or pelvic pain should not be overlooked—early evaluation and targeted intervention are key to long-term musculoskeletal health.

Sources

Disclaimer RAD Clinics currently provides ultrasound scan services only. Other tests and screenings mentioned in this article, such as blood tests, cervical smears, and DEXA (bone density) scans, are not available at RAD Clinics at this time. The information provided is for general educational purposes and should not replace medical advice from your GP or healthcare provider.