SI Joint Blockage: Causes, Symptoms & Treatment
An SI joint blockage is a functional restriction of the sacroiliac joint causing lower back pain. It is common and responds well to treatment.
Things worth knowing about "SI Joint Blockage"
An SI joint blockage is a functional restriction of the sacroiliac joint causing lower back pain. It is common and responds well to treatment.
What Is an SI Joint Blockage?
An SI joint blockage refers to a functional movement restriction of the sacroiliac joint (SI joint). This joint connects the sacrum (the triangular bone at the base of the spine) with the ilium (the large pelvic bone) on each side of the body. It acts as a key link between the spinal column and the pelvis. When this joint becomes blocked or restricted, it can cause significant pain and limited mobility.
Causes
An SI joint blockage can be triggered by a variety of factors:
- Poor posture or overloading, such as carrying heavy loads on one side, prolonged sitting or standing
- Unaccustomed physical activity, such as intense sport or heavy manual labor
- Falls or trauma with direct impact on the pelvis
- Pregnancy, where hormonal changes loosen ligaments and reduce joint stability
- Muscle imbalances or tension in the back and pelvic muscles
- Leg length discrepancies, which can tilt the pelvis over time
Symptoms
The symptoms of an SI joint blockage can vary and are often mistaken for other back conditions:
- Sudden, sharp pain in the lower back, usually on one side
- Pain radiating into the buttocks, hip, or thigh
- Restricted movement when getting up, bending, or climbing stairs
- Pain during prolonged sitting or standing
- A feeling of instability in the pelvic area
- Occasional tingling or numbness in the leg (pseudo-radicular symptoms)
Diagnosis
Diagnosis is primarily clinical and is performed by a physician or physiotherapist using the following approaches:
- Medical history: Assessment of symptoms, onset, and aggravating factors
- Manual functional testing: Specific provocation tests such as the FABER test, the standing flexion test, and compression or distraction tests of the SI joint
- Imaging (X-ray, MRI): To exclude structural pathologies such as osteoarthritis, inflammation, or fracture
Because the SI joint can also be involved in inflammatory conditions such as ankylosing spondylitis (Morbus Bechterew), careful differential diagnosis is essential.
Treatment
Conservative Treatment
Most SI joint blockages respond well to conservative management:
- Manual therapy or chiropractic treatment: Targeted manipulation techniques to restore normal joint mobility
- Physiotherapy: Strengthening and stretching of pelvic, hip, and back muscles to improve stability
- Heat or cold therapy for local pain relief
- Pain medication (e.g., ibuprofen, diclofenac) for short-term relief of acute symptoms
- Muscle relaxants when accompanied by significant muscle tension
Interventional Treatment
For persistent or severe pain, additional treatment options are available:
- SI joint injection: Injection of a local anesthetic and/or corticosteroid directly into the joint under imaging guidance
- Radiofrequency ablation: Used for long-term pain reduction in chronic cases
Prevention
To prevent recurrence of an SI joint blockage, the following measures are recommended:
- Regular strengthening exercises for the pelvis and lower back
- Ergonomic sitting habits and back-friendly lifting techniques
- Correction of leg length discrepancies with appropriate shoe insoles
- Avoiding prolonged one-sided physical strain
References
- Schwarzer AC et al. - The sacroiliac joint in chronic low back pain. Spine. 1995;20(1):31-37. PubMed.
- Airaksinen O et al. - European guidelines for the management of chronic nonspecific low back pain. Eur Spine J. 2006;15(Suppl 2):S192-S300.
- Vleeming A et al. - The sacroiliac joint: an overview of its anatomy, function and potential clinical implications. J Anat. 2012;221(6):537-567.
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