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M46.1 Sacroiliitis – Causes, Symptoms & Treatment
M46.1 is the ICD-10 code for sacroiliitis (not elsewhere classified) – an inflammation of the sacroiliac joints that can cause severe lower back pain.
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M46.1 is the ICD-10 code for sacroiliitis (not elsewhere classified) – an inflammation of the sacroiliac joints that can cause severe lower back pain.
What is M46.1 – Sacroiliitis?
M46.1 is the ICD-10 diagnosis code for sacroiliitis, an inflammation of the sacroiliac joint (SIJ). This joint connects the sacrum to the ilium (part of the pelvis) and plays a key role in transferring forces between the spine and the legs. Inflammation in this area can cause significant pain in the lower back, buttocks, and legs.
Causes
Sacroiliitis can be triggered by a variety of underlying conditions or external factors:
- Inflammatory rheumatic diseases: Ankylosing spondylitis (also known as Bechterew's disease) is the most common cause. Other spondyloarthropathies such as reactive arthritis or psoriatic arthritis are also frequently associated.
- Infections: Bacterial infections (e.g. caused by Staphylococcus aureus, tuberculosis, or brucellosis) can affect the sacroiliac joint directly.
- Trauma: Injuries or chronic overloading of the pelvis may trigger inflammatory responses in the joint.
- Pregnancy: The altered biomechanical stress on the pelvis during pregnancy can irritate the sacroiliac joint.
- Degenerative changes: Wear and tear of the joint can also lead to inflammation over time.
Symptoms
The typical symptoms associated with M46.1 include:
- Pain in the lower back and buttocks, often one-sided but sometimes bilateral
- Pain that may radiate into the hip, thigh, or leg
- Morning stiffness that tends to improve with movement
- Worsening pain after prolonged sitting or standing
- Tenderness to pressure over the sacroiliac joint
- In infectious cases: fever and general malaise
Diagnosis
Diagnosing sacroiliitis typically involves a combination of the following:
- Clinical examination: Specific provocation tests such as the FABER test or the pelvic compression test can indicate sacroiliac joint involvement.
- Imaging: X-rays may reveal structural changes in later disease stages. MRI (magnetic resonance imaging) is the most sensitive method for early diagnosis, detecting inflammatory changes before structural damage occurs.
- Laboratory tests: Inflammatory markers such as CRP and ESR, along with HLA-B27 genetic testing, can support the diagnosis.
- Microbiological investigations: If infectious sacroiliitis is suspected, blood cultures or joint aspiration may be performed.
Treatment
Treatment depends on the underlying cause of the sacroiliitis:
Medication
- Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac are the first-line treatment for pain relief and reduction of inflammation.
- Corticosteroids may be given locally (intra-articular injection) or systemically.
- For inflammatory rheumatic disease: biologics (e.g. TNF-alpha inhibitors) or disease-modifying antirheumatic drugs (DMARDs).
- For infectious sacroiliitis: targeted antibiotic therapy based on the identified pathogen.
Physical and Exercise Therapy
- Targeted physiotherapy exercises to strengthen the core muscles and improve joint mobility
- Heat therapy for muscle relaxation
Additional Interventions
- Intra-articular injections with corticosteroids or PRP (platelet-rich plasma)
- Radiofrequency ablation for chronic, refractory cases
- In rare cases, surgical joint fusion (sacroiliac fusion)
References
- World Health Organization (WHO): ICD-10 International Classification of Diseases, 10th Revision – M46.1 Sacroiliitis, not elsewhere classified. WHO, Geneva.
- Rudwaleit M. et al.: The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis. Annals of the Rheumatic Diseases, 2009; 68(6): 770–776.
- Braun J., Sieper J.: Ankylosing spondylitis. The Lancet, 2007; 369(9570): 1379–1390.
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