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Sacroiliac Joint (SIJ): Function, Pain and Treatment
The sacroiliac joint (SIJ) connects the pelvis to the spine. Problems in this area often cause lower back pain and can be effectively treated with various therapies.
Things worth knowing about "Sacroiliac Joint"
The sacroiliac joint (SIJ) connects the pelvis to the spine. Problems in this area often cause lower back pain and can be effectively treated with various therapies.
What Is the Sacroiliac Joint?
The sacroiliac joint (commonly abbreviated as SIJ) is one of the key structural connections in the human body. It links the sacrum (the triangular bone at the base of the spine) to the ilium, the uppermost part of the pelvis. Located on both sides of the lower back, the sacroiliac joint plays a crucial role in transferring forces between the upper body and the legs. It is classified as an amphiarthrosis – a joint with very limited mobility – stabilized by some of the strongest ligaments in the body.
Anatomy and Function
The surfaces of the sacroiliac joint are covered with cartilage and held together by a dense network of ligaments. Despite its limited range of motion, the SIJ performs several vital functions:
- Transmitting body weight from the trunk to the pelvis and lower limbs
- Absorbing impact forces during walking, running, and jumping
- Stabilizing the pelvis during movement
- Allowing slight adaptive movement during pregnancy and childbirth
Causes of Sacroiliac Joint Disorders
Sacroiliac joint problems can arise from a variety of causes:
- Inflammatory conditions: Such as sacroiliitis associated with ankylosing spondylitis or other forms of spondyloarthritis
- Degenerative changes: Age-related wear and tear of the joint cartilage
- Joint dysfunction: Altered movement patterns caused by muscle imbalances or poor posture
- Trauma: Falls, accidents, or repetitive stress injuries
- Pregnancy and postpartum: Hormonal relaxation of ligaments can destabilize the joint
- Leg length discrepancy: Unequal leg lengths creating asymmetric loading of the joint
Symptoms
Common symptoms of sacroiliac joint disorders include:
- Deep, dull lower back pain, often on one side
- Pain in the buttocks, which may radiate into the thigh or groin
- Worsened pain when standing up, sitting for long periods, or climbing stairs
- Morning stiffness in the pelvic region
- Discomfort when turning over in bed or standing on one leg
Diagnosis
Diagnosing sacroiliac joint conditions typically involves:
- Physical examination: Provocation tests such as the Patrick (FABER) test or Gaenslen test to reproduce SIJ pain
- Imaging: X-ray, MRI (magnetic resonance imaging), or CT scan to detect inflammation, degeneration, or structural changes
- Diagnostic injection: A local anesthetic injected directly into the joint can confirm the diagnosis and provide temporary relief
- Laboratory tests: Blood tests including HLA-B27 antigen screening if inflammatory arthritis is suspected
Treatment
Conservative Treatment
Most sacroiliac joint problems respond well to non-surgical treatment:
- Physical therapy: Strengthening of core and pelvic muscles, along with mobilization exercises
- Manual therapy and chiropractic care: Targeted mobilization to restore normal joint movement
- Pain-relieving medications: Non-steroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation and pain
- Heat or cold therapy: Applied depending on the nature of the condition
- Corticosteroid injections: Targeted injections into the joint to reduce inflammation
Surgical Treatment
In rare cases where conservative treatments fail to provide adequate relief, sacroiliac joint fusion (arthrodesis) may be considered. This procedure joins the joint surfaces together to eliminate painful movement permanently.
Treatment for Inflammatory Conditions
When the sacroiliac joint is affected by inflammatory diseases such as ankylosing spondylitis, biologics (e.g., TNF inhibitors) or other disease-modifying antirheumatic drugs (DMARDs) may be prescribed to control long-term inflammation.
References
- Sieper J. et al. - Ankylosing spondylitis: an overview. Annals of the Rheumatic Diseases, 2002.
- Vleeming A. et al. - The sacroiliac joint: an overview of its anatomy, function and potential clinical implications. Journal of Anatomy, 2012.
- Cohen S.P. - Sacroiliac joint pain: a comprehensive review of anatomy, diagnosis, and treatment. Anesthesia and Analgesia, 2005.
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