Sacroiliitis: Understanding Symptoms, Treatment, and Living Well with Low Back Pain

Explore the comprehensive guide to sacroiliitis, from recognizing symptoms to effective treatments. Learn how to manage low back pain, understand the difference between sacroiliitis and sacroiliac joint pain, and find expert advice for living well with this condition.

The sacrum, ilium and sacroiliac joints.


What is sacroiliitis?

The sacroiliac (SI) joint is a crucial joint in the human body that connects the sacrum (the triangular bone at the base of the spine) to the ilium (the large, wing-shaped pelvic bone). There are two sacroiliac joints, one on each side of the sacrum, and they play a vital role in supporting the spine and transferring the weight of the upper body to the hips and legs.

The sacroiliac joint is unique in its structure and function. It has limited mobility compared to other joints in the body, primarily designed to provide stability and support rather than a wide range of motion. The joint is surrounded by a network of ligaments and muscles that contribute to its stability.

Despite its limited movement, the sacroiliac joint is not entirely rigid. It allows for a small amount of motion, which is essential for activities such as walking and absorbing forces during weight-bearing. The degree of movement can vary among individuals.

Sacroiliac joint dysfunction or pain can occur when there is inflammation, degeneration, or instability in the joint. This condition may result from trauma, arthritis, pregnancy-related changes, anatomical abnormalities, or wear and tear over time. Sacroiliac joint pain often manifests as lower back pain, hip pain, or discomfort in the buttocks region. Diagnosing sacroiliac joint issues can be challenging as the symptoms can overlap with other musculoskeletal conditions.

Treatment for sacroiliac joint pain typically involves a combination of medications, physical therapy, injections, and, in some cases, surgical interventions. Lifestyle modifications, such as maintaining proper posture and engaging in exercises that strengthen the core and supporting muscles, are also essential in managing sacroiliac joint issues.

Types of sacroiliitis

Sacroiliitis refers to the inflammation of one or both sacroiliac joints, which are the joints connecting the sacrum (the triangular bone at the base of the spine) to the ilium (the pelvic bone). Sacroiliitis can be associated with various conditions, and the types of sacroiliitis are often classified based on the underlying cause. Here are some common types:

  1. Inflammatory Sacroiliitis:
  • This type is often associated with inflammatory conditions such as ankylosing spondylitis, psoriatic arthritis, and reactive arthritis. Inflammatory sacroiliitis is characterized by chronic inflammation that may lead to pain, stiffness, and eventually fusion of the sacroiliac joints.
  1. Infectious Sacroiliitis:
  • Infection, typically bacterial, can lead to sacroiliitis. Infections may occur due to the spread of bacteria through the bloodstream or by direct extension from nearby structures. Common organisms include Staphylococcus aureus and Streptococcus species.
  1. Degenerative Sacroiliitis:
  • Degenerative changes in the sacroiliac joint can result from wear and tear over time. This type of sacroiliitis is often seen in older adults and is associated with conditions like osteoarthritis. Degenerative sacroiliitis can lead to pain and stiffness in the lower back and buttocks.
  1. Traumatic Sacroiliitis:
  • Trauma or injury to the sacroiliac joint can cause inflammation and lead to sacroiliitis. This may occur due to a fall, motor vehicle accident, or other forms of physical trauma.
  1. Pregnancy-Related Sacroiliitis:
  • Pregnancy can lead to hormonal changes that affect the ligaments and joints, including the sacroiliac joints. This type of sacroiliitis, often temporary, may cause pain and discomfort during pregnancy.
  1. Idiopathic Sacroiliitis:
  • In some cases, the cause of sacroiliitis may not be clearly identified, leading to the classification of idiopathic sacroiliitis. It’s essential to thoroughly evaluate the patient’s medical history, symptoms, and perform diagnostic tests to rule out other potential causes.
  1. Post-Infectious Sacroiliitis:
  • Following an infection, the immune system’s response can lead to persistent inflammation in the sacroiliac joints. This type of sacroiliitis may develop after the resolution of an initial infection.

Diagnosing the specific type of sacroiliitis requires a thorough medical examination, imaging studies (such as X-rays or MRI), and, in some cases, blood tests to identify markers of inflammation. Treatment approaches will vary based on the underlying cause, and may include medications, physical therapy, and lifestyle modifications. Consulting with a healthcare professional is crucial for an accurate diagnosis and appropriate management.

How common is sacroiliitis?

Sacroiliitis is not uncommon, and its prevalence can vary based on the population studied and the underlying causes considered. It is more frequently observed in certain patient groups and conditions. Here are some key points regarding the prevalence of sacroiliitis:

  1. Ankylosing Spondylitis (AS): Ankylosing spondylitis is a chronic inflammatory arthritis that primarily affects the spine, and sacroiliitis is a hallmark feature of this condition. AS is estimated to affect approximately 0.1-0.5% of the general population, and sacroiliitis is a common manifestation.
  2. Psoriatic Arthritis: Sacroiliitis is also common in psoriatic arthritis, a type of inflammatory arthritis that affects individuals with psoriasis. The prevalence of psoriatic arthritis itself is estimated to be around 0.1-0.3% in the general population.
  3. Reactive Arthritis: Reactive arthritis, which can include sacroiliitis as part of its spectrum of symptoms, is less common but can occur following certain infections. The prevalence of reactive arthritis varies based on the population studied and the specific triggering infections.
  4. General Population: Non-specific sacroiliitis or sacroiliac joint pain can occur in the general population due to various reasons, including degenerative changes, trauma, or other inflammatory conditions. However, estimating the prevalence of isolated sacroiliitis in the general population can be challenging.
  5. Gender and Age: Sacroiliitis, especially in conditions like ankylosing spondylitis, tends to affect men more frequently than women. It often becomes symptomatic in late adolescence or early adulthood. However, sacroiliitis can occur at any age.

It’s important to note that the prevalence of sacroiliitis may be underestimated because some cases can be asymptomatic or cause mild symptoms that go undiagnosed. Additionally, improved awareness and diagnostic techniques may contribute to more accurate identification of sacroiliitis cases.

If an individual experiences symptoms such as lower back pain, hip pain, or stiffness, especially in the context of inflammatory arthritis or other relevant conditions, seeking medical evaluation is crucial for proper diagnosis and management. Early detection and intervention can help improve outcomes and quality of life for individuals with sacroiliitis.


Symptoms and Causes

Symptoms of Sacroiliitis:

The symptoms of sacroiliitis can vary depending on the underlying cause and the severity of inflammation. Common signs and symptoms associated with sacroiliitis include:

  1. Lower Back Pain:
  • Persistent or intermittent pain in the lower back, typically on one side or both sides.
  1. Hip and Buttock Pain:
  • Pain may radiate from the sacroiliac joints into the hips and buttocks. The discomfort is often deep and can be aggravated by movement.
  1. Stiffness:
  • Stiffness in the lower back and hips, especially after periods of inactivity or prolonged sitting.
  1. Pain During Movement:
  • Pain may intensify with certain movements, such as standing up, climbing stairs, or transitioning from sitting to standing.
  1. Altered Gait:
  • Changes in walking patterns or gait, often due to discomfort and an attempt to avoid aggravating the affected joints.
  1. Reduced Range of Motion:
  • Limited flexibility and reduced range of motion in the lower back and hips.
  1. Pain with Weight Bearing:
  • Discomfort during activities that involve bearing weight on the affected side, such as standing or walking.
  1. Painful Sleeping Positions:
  • Discomfort may be more pronounced during specific sleeping positions, especially on the side of the affected sacroiliac joint.

Causes of Sacroiliitis:

  1. Inflammatory Arthritis:
  • Conditions like ankylosing spondylitis, psoriatic arthritis, and reactive arthritis can cause chronic inflammation of the sacroiliac joints.
  1. Infection:
  • Bacterial infections, especially in the urinary or gastrointestinal tracts, can lead to infectious sacroiliitis.
  1. Trauma:
  • Injury or trauma to the sacroiliac joint, such as fractures or dislocations, can result in inflammation.
  1. Pregnancy-Related Changes:
  • Hormonal changes during pregnancy can affect the ligaments around the sacroiliac joints, leading to pain and inflammation.
  1. Degenerative Changes:
  • Osteoarthritis or degenerative changes in the sacroiliac joint due to aging or wear and tear.
  1. Autoimmune Diseases:
  • Certain autoimmune diseases, such as lupus, may contribute to inflammation in the sacroiliac joints.
  1. Anatomical Abnormalities:
  • Structural abnormalities or variations in the anatomy of the sacroiliac joint may contribute to dysfunction and inflammation.
  1. Unknown Causes (Idiopathic):
  • In some cases, the cause of sacroiliitis may remain unknown, leading to the classification of idiopathic sacroiliitis.

When to Seek Medical Attention:

If you experience persistent lower back pain, hip pain, or stiffness, especially if it worsens with time or interferes with daily activities, it is essential to consult with a healthcare professional. Early diagnosis and appropriate management can help alleviate symptoms and prevent complications associated with sacroiliitis. Diagnostic tests such as X-rays, MRI, and blood tests may be used to identify the cause and guide treatment.

What are complications of sacroiliitis?

Sacroiliitis, if left untreated or poorly managed, can lead to various complications that may impact an individual’s overall health and quality of life. The severity of complications can vary depending on the underlying cause and the extent of inflammation. Some potential complications of sacroiliitis include:

  1. Reduced Mobility:
  • Persistent inflammation and pain in the sacroiliac joints can lead to stiffness and reduced range of motion in the lower back and hips. Over time, this can contribute to difficulties in performing daily activities and may lead to a sedentary lifestyle.
  1. Spinal Fusion:
  • In conditions like ankylosing spondylitis, sacroiliitis may progress to involve the spine, leading to the fusion of vertebrae. This fusion can result in a loss of spinal flexibility and contribute to a stooped or hunched posture.
  1. Chronic Pain:
  • Long-term inflammation and ongoing sacroiliac joint dysfunction can result in chronic pain, which may impact an individual’s overall well-being and mental health.
  1. Functional Impairment:
  • Sacroiliitis can affect an individual’s ability to perform daily tasks, such as walking, standing, and bending. Functional impairment may lead to a reduced quality of life.
  1. Pelvic Instability:
  • In some cases, sacroiliitis can cause instability in the pelvic region, leading to difficulties in weight-bearing activities and potentially affecting gait.
  1. Impaired Sleep:
  • Pain and discomfort associated with sacroiliitis may interfere with sleep, leading to insomnia or disrupted sleep patterns.
  1. Psychosocial Impact:
  • Living with chronic pain and a potentially debilitating condition can have psychological and emotional consequences, contributing to stress, anxiety, and depression.
  1. Secondary Osteoarthritis:
  • Chronic inflammation in the sacroiliac joints may contribute to the development of secondary osteoarthritis, further exacerbating joint damage and pain.
  1. Complications from Medications:
  • Some medications used to manage sacroiliitis, such as nonsteroidal anti-inflammatory drugs (NSAIDs) or corticosteroids, may have side effects or long-term complications. It’s essential to monitor and manage the use of medications under the guidance of healthcare professionals.
  1. Impact on Reproductive Health:
    • In women, pregnancy-related sacroiliitis may affect reproductive health and lead to discomfort during pregnancy. Proper management is crucial to minimize the impact on maternal and fetal well-being.

It’s important to note that early diagnosis, appropriate medical intervention, and a comprehensive treatment plan can help mitigate the risk of complications associated with sacroiliitis. Regular medical follow-ups, physical therapy, lifestyle modifications, and, in some cases, surgical interventions may be recommended to manage symptoms and prevent long-term consequences. Individuals experiencing symptoms of sacroiliitis should seek timely medical attention to receive an accurate diagnosis and appropriate care.

Diagnosing sacroiliitis involves a combination of medical history assessment, physical examination, and various diagnostic tests to identify the underlying cause and assess the extent of inflammation. Here are some common methods used for the diagnosis of sacroiliitis:

Management and Treatment

1. Medical History and Physical Examination:

  • The healthcare provider will conduct a thorough medical history interview to understand the patient’s symptoms, their onset, and any factors that may aggravate or alleviate the pain. A physical examination will be performed to assess the range of motion, tenderness, and signs of inflammation in the lower back and pelvic region.

2. Imaging Studies:

  • X-rays: X-rays can help visualize changes in the sacroiliac joints, such as erosions, sclerosis, or joint space narrowing. However, early inflammatory changes may not be apparent on X-rays.
  • Magnetic Resonance Imaging (MRI): MRI is highly sensitive for detecting inflammation and structural changes in the sacroiliac joints. It can provide detailed images of soft tissues, bone marrow, and ligaments.
  • Computerized Tomography (CT) Scan: CT scans may be used to assess bony structures and detect abnormalities in the sacroiliac joints.

3. Blood Tests:

  • C-reactive Protein (CRP) and Erythrocyte Sedimentation Rate (ESR): Elevated levels of CRP and ESR are markers of inflammation and can help support the diagnosis of sacroiliitis.
  • HLA-B27 Testing: HLA-B27 is a genetic marker associated with certain inflammatory arthropathies, including ankylosing spondylitis. However, its presence is not exclusive to these conditions.

4. Bone Scans:

  • Nuclear medicine bone scans may be used to detect increased bone turnover in the sacroiliac joints, indicating inflammation.

5. Diagnostic Injections:

  • Sacroiliac Joint Injection: A local anesthetic and a corticosteroid may be injected into the sacroiliac joint under fluoroscopic guidance. If the injection provides temporary relief of symptoms, it can support the diagnosis of sacroiliitis.

6. Laboratory Tests:

  • Testing for Inflammatory Conditions: If an inflammatory condition is suspected, additional laboratory tests may be conducted, such as rheumatoid factor, antinuclear antibodies (ANA), and specific autoantibodies related to certain autoimmune diseases.

7. Physical Examination Techniques:

  • Faber Test (Patrick’s Test): This involves passive flexion, abduction, and external rotation of the hip to assess sacroiliac joint dysfunction.
  • Gaenslen’s Test: This test involves hyperextending one hip while the opposite hip is flexed to stress the sacroiliac joint.

8. Clinical Assessment Tools:

  • Bath Ankylosing Spondylitis Disease Activity Index (BASDAI): A questionnaire assessing disease activity and symptoms, commonly used in the context of ankylosing spondylitis.

9. Electrodiagnostic Testing:

  • Electromyography (EMG) and nerve conduction studies may be conducted to evaluate nerve involvement and rule out other potential causes of symptoms.

10. Consultation with Specialists:

  • Rheumatologists, orthopedic specialists, or physical medicine and rehabilitation specialists may be involved in the diagnostic process, especially for complex or atypical cases.

The diagnostic process for sacroiliitis is often a collaborative effort involving multiple healthcare professionals. It is important for individuals experiencing symptoms to seek timely medical attention for an accurate diagnosis and appropriate management. Early intervention can help prevent complications and improve outcomes for individuals with sacroiliitis.


While it may not be possible to prevent all cases of sacroiliitis, especially those related to genetic factors or certain medical conditions, there are lifestyle modifications and strategies that individuals can adopt to reduce the risk of developing sacroiliitis or manage its symptoms effectively. Here are some preventive measures and lifestyle considerations:

1. Maintain a Healthy Lifestyle:

  • Regular Exercise: Engage in regular, low-impact exercises to promote overall joint health and flexibility. Focus on activities that strengthen core muscles and support the spine.
  • Healthy Diet: Adopt a well-balanced diet rich in nutrients to support bone health and overall well-being. Adequate intake of calcium and vitamin D is essential for bone health.

2. Good Posture:

  • Maintain proper posture, especially when sitting for prolonged periods. Ergonomic adjustments in the workplace and at home can help reduce stress on the sacroiliac joints.

3. Weight Management:

  • Maintain a healthy weight to reduce the load on the spine and sacroiliac joints. Excess body weight can contribute to joint strain and inflammation.

4. Avoid Smoking:

  • Smoking has been linked to increased inflammation and a higher risk of certain inflammatory conditions. Quitting smoking can have positive effects on overall health.

5. Regular Physical Check-ups:

  • Attend regular health check-ups to monitor overall health and discuss any concerns with a healthcare professional.

6. Protect Against Infections:

  • Practice good hygiene to prevent infections that may contribute to reactive sacroiliitis. Seek prompt medical attention if you develop symptoms of infection.

7. Caution in Physical Activities:

  • Take precautions during physical activities to avoid injuries that may impact the sacroiliac joints. Use proper techniques and protective gear when engaging in sports or physical labor.

8. Early Intervention:

  • If you experience symptoms such as persistent lower back pain or discomfort in the pelvic region, seek medical attention early. Early diagnosis and intervention can help manage symptoms and prevent complications.

9. Monitor and Manage Autoimmune Conditions:

  • If you have autoimmune conditions such as ankylosing spondylitis or psoriatic arthritis, work closely with healthcare professionals to manage the condition effectively and prevent complications.

10. Maintain Emotional Well-being:

  • Chronic pain conditions can have an impact on mental health. Practice stress-reducing techniques, engage in activities you enjoy, and seek support from friends, family, or mental health professionals.

11. Adopt Joint-friendly Exercises:

  • Incorporate joint-friendly exercises like swimming, walking, and gentle yoga into your routine. These activities can help maintain joint flexibility and reduce the risk of joint-related issues.

12. Consult with Healthcare Professionals:

  • Regularly consult with healthcare professionals, especially if you have a family history of inflammatory conditions or experience persistent joint pain.

It’s important to note that while these preventive measures can contribute to overall well-being and joint health, there is no guaranteed way to prevent all cases of sacroiliitis. Individuals with specific risk factors or symptoms should consult with healthcare professionals for personalized advice and management strategies. Early detection and intervention remain key factors in addressing sacroiliitis effectively.

Outlook / Prognosis

Is sacroiliitis permanent?

The outlook (prognosis) for sacroiliitis varies depending on the underlying cause, the severity of inflammation, and the effectiveness of treatment. Sacroiliitis can be a chronic condition, but with appropriate management, many individuals can experience symptom relief and maintain a good quality of life. The prognosis is influenced by factors such as:

1. Underlying Cause:

  • The prognosis may differ based on the specific underlying cause of sacroiliitis. Conditions like ankylosing spondylitis or psoriatic arthritis, which can cause chronic inflammation and structural changes, may have a more prolonged course.

2. Early Diagnosis and Treatment:

  • Early detection and intervention are crucial for managing sacroiliitis effectively. Prompt treatment can help control inflammation, reduce symptoms, and prevent or minimize long-term complications.

3. Treatment Response:

  • The response to various treatment modalities, including medications, physical therapy, and lifestyle modifications, can impact the prognosis. Some individuals may find significant relief, while others may require ongoing management to control symptoms.

4. Individual Variation:

  • The course of sacroiliitis can vary widely among individuals. Some may experience periods of flare-ups followed by periods of remission, while others may have more persistent symptoms.

5. Severity of Inflammation:

  • The degree of inflammation in the sacroiliac joints and surrounding structures can influence the prognosis. Severe or advanced inflammation may lead to more significant joint damage and functional impairment.

6. Complications:

  • Complications such as spinal fusion or secondary osteoarthritis can impact the long-term outlook. Early identification and management of complications are important for optimizing outcomes.

7. Adherence to Treatment Plans:

  • Adherence to prescribed treatment plans, including medications, physical therapy exercises, and lifestyle modifications, is crucial for managing sacroiliitis and improving the prognosis.

8. Regular Monitoring:

  • Regular monitoring by healthcare professionals, including rheumatologists and orthopedic specialists, is important to assess the progression of the condition and adjust treatment as needed.

9. Lifestyle Factors:

  • Factors such as maintaining a healthy lifestyle, including regular exercise, a balanced diet, and weight management, can positively impact the prognosis and overall well-being.

10. Individual Coping Strategies:

  • Coping strategies, emotional well-being, and a positive outlook can also contribute to an improved quality of life for individuals with sacroiliitis.

While sacroiliitis can be a chronic condition, advancements in medical treatments and a comprehensive, multidisciplinary approach to care have significantly improved outcomes for many individuals. It’s important for individuals with sacroiliitis to work closely with healthcare professionals to develop and follow a personalized treatment plan. Regular communication with the healthcare team, including discussing any changes in symptoms, is essential for ongoing management and optimizing the long-term outlook.

Living with Sacroiliitis: A Guide to Seeking Care and Understanding Your Condition

When to Seek Healthcare Provider Guidance:
If you are experiencing new or worsening pain in your low back, it is advisable to consult with a healthcare provider. Reach out to your provider if you notice that your pain is escalating or if your current treatments for sacroiliitis are becoming less effective.

Questions to Ask Your Healthcare Provider:
During your consultation with your healthcare provider, consider asking the following questions to better understand your condition and treatment options:

  1. Do I have sacroiliitis, sacroiliac joint pain, or is there another cause for my lower back pain?
  2. Is arthritis a factor, and if so, what type?
  3. Will physical therapy be beneficial for my condition?
  4. What medications are recommended for managing my symptoms?
  5. Is surgery a potential option for my case?

Additional Common Questions:

Is Sacroiliitis the Same as Sacroiliac Joint Pain?
While experiencing pain in or around the sacroiliac joint, it is essential to differentiate between sacroiliitis and general sacroiliac joint pain. Sacroiliitis involves joint inflammation, which requires a healthcare provider’s diagnosis. If pain persists beyond a week, seeking professional guidance is advisable to identify the cause and receive appropriate treatment.

Note from Cleveland Clinic:
Sacroiliitis, characterized by inflammation at the joint where the spine meets the pelvis, often leads to low back pain. Dealing with pain can be challenging, affecting your ability to move and use your body comfortably. The reassuring news is that, regardless of the cause, a healthcare provider can assist you in managing symptoms, often through avenues such as physical therapy. While physical therapy may demand effort, take the time to acknowledge your progress and celebrate your successes along the way. Remember, your healthcare provider is there to guide you through the process of finding effective strategies to cope with and alleviate your symptoms.

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