Ankylosing Spondylitis

Introduction

Ankylosing Spondylitis, often referred to simply as spondylitis, is a chronic inflammatory condition that primarily affects the spine. Understanding what ankylosing spondylitis is involves recognising that it is a form of arthritis that causes inflammation of the vertebrae (the bones of the spine), leading to severe, chronic pain and discomfort.

In severe cases, the inflammation can lead to new bone formation in the spine, causing sections of the spine to fuse or “ankylose,” resulting in a rigid, inflexible spine.

The good news is that with early diagnosis and the right care, people with ankylosing spondylitis can manage their symptoms, slow disease progression and maintain better spinal mobility and quality of life.

If you suspect you have persistent back pain, stiffness or other symptoms of ankylosing spondylitis, know that help is here for you.

Signs & Symptoms

Spotting symptoms early can make a big difference in seeking timely help. Symptoms often develop gradually over several months or years.

Common signs and symptoms include:

Understanding ankylosing spondylitis and recognising these patterns can help you act sooner. If you notice these persistent signs, talk to your specialist immediately.

Causes & Risk Factors

The exact cause of ankylosing spondylitis is unknown, but it is believed to involve a combination of genetic and environmental factors.

Ankylosing spondylitis is fundamentally an autoimmune condition where the body’s immune system attacks its tissues.

Key factors being researched regarding the causes include:

Understanding the difference between spondylosis vs spondylitis is important. To define spondylitis simply means inflammation of the vertebrae, as spondylosis refers to degenerative changes. The underlying mechanisms help your specialist find the right treatment plan for your condition.

Diagnosis

An accurate ankylosing spondylitis diagnosis will confirm if you have the condition and determine the next steps for treatment.

Early diagnosis is crucial to prevent significant spinal damage.

  • Detailed medical history and symptom review: Your specialist will ask about your symptoms, including the onset, location and pattern of your back pain and stiffness, and any family history of the disease.

  • Physical examination: Your specialist will assess your spinal flexibility, posture and tenderness in affected joints, particularly the sacroiliac joints (at the base of the spine).

  • Imaging scans:
    • X-rays can show changes in the sacroiliac joints and spine, though early changes may not be visible.
    • Magnetic Resonance Imaging (MRI) for detecting early inflammation and bone changes in the spine and sacroiliac joints.

  • Blood tests:
    • HLA-B27 test: Checks for the presence of the HLA-B27 gene. While its presence supports the diagnosis, it is not conclusive on its own, as many people with this gene don’t develop ankylosing spondylitis.
    • Inflammatory markers: Erythrocyte Sedimentation Rate (ESR) and C-reactive protein (CRP) levels can indicate inflammation in the body.

Types of Ankylosing Spondylitis

While Ankylosing Spondylitis (AS) is a specific diagnosis, it belongs to a broader group of inflammatory rheumatic diseases known as spondyloarthritis. These conditions share common features, including inflammation of the spine, sacroiliac joints and peripheral joints, as well as enthesitis (inflammation where ligaments and tendons attach to bone).

1. Ankylosing Spondylitis (Radiographic Axial Spondyloarthritis)

  • Description: A chronic inflammatory condition primarily affecting the spine and sacroiliac joints, visible on X-rays.

  • Pattern: Typically begins in the lower back and progresses upwards. May cause stiffness, pain and reduced spinal mobility.

  • Progression: Symptoms often start in early adulthood and gradually worsen. Over time, spinal bones may fuse, leading to severe stiffness (ankylosis).

2. Non-Radiographic Axial Spondyloarthritis

  • Description: Shares clinical features with ankylosing spondylitis but lacks visible changes on X-ray. Inflammation is usually detected through MRI or blood markers.

  • Pattern: Involves the sacroiliac joints and spine, often with back pain and stiffness that improve with exercise.

  • Progression: Can remain stable or progress to radiographic disease (AS) in some individuals, though not all cases will advance.

3. Peripheral Spondyloarthritis

  • Description: Inflammatory arthritis affecting joints outside the spine, such as knees, ankles, and fingers.

  • Pattern: Presents with asymmetrical joint pain, swelling, and enthesitis (inflammation where tendons/ligaments attach to bones).

  • Progression: May be intermittent or persistent. Symptoms can fluctuate in severity and may be linked to axial symptoms over time.

4. Psoriatic Arthritis (SpA type)

  • Description: A type of spondyloarthritis linked to psoriasis. It can affect both peripheral joints and the spine.

  • Pattern: Varies widely—from isolated finger/toe involvement (dactylitis) to spinal inflammation and joint deformities.

  • Progression: Some patients experience mild symptoms while others may develop progressive joint damage if untreated.

5. Enteropathic Arthritis

  • Description: A form of spondyloarthritis associated with inflammatory bowel diseases like Crohn’s disease and ulcerative colitis.

  • Pattern: Joint symptoms often flare during intestinal disease activity. May affect the spine (axial) or limbs (peripheral).

  • Progression: Symptoms may improve with control of bowel disease, but can become chronic or recur with IBD flares.

Treatments

Treatment focuses on reducing inflammation, relieving pain, improving spinal mobility and preventing spinal fusion.

Key treatment elements for ankylosing spondylitis:

When managed properly, people with ankylosing spondylitis can live full, active lives and slow the progression of their condition.

Ready to learn what might help you? Learn more about ankylosing spondylitis treatments on this page.

Complications

Without treatment, ankylosing spondylitis can lead to:

Prevention

You can lower the risk of severe progression and complications by:

Living with Ankylosing Spondylitis

Living well means managing your condition day to day:

Navigating Ankylosing Spondylitis in Singapore

The Problem and Types of Conditions

Ankylosing spondylitis is a chronic inflammatory condition that mainly affects the spine and sacroiliac joints, causing pain, stiffness, and reduced mobility. Over time, this condition may also impact other areas such as the hips, shoulders or even organs like the eyes.

Recognising ankylosing spondylitis early is important, as delayed diagnosis can lead to worsening symptoms and complications like spinal fusion.

Consultation to Ongoing Care

For patients with ankylosing spondylitis in Singapore, the journey usually begins with a consultation with a rheumatologist, who will conduct physical examinations, imaging, and blood tests to confirm the diagnosis. From there, treatment may involve medication such as anti-inflammatories or biologics, physiotherapy to maintain mobility, and lifestyle adjustments.

Ongoing care often includes regular monitoring of inflammation markers and follow-ups to assess progress. This step-by-step approach helps patients visualise the path from diagnosis to long-term management, ensuring that both symptom control and quality of life are prioritised.

When to Seek Help

Patients should seek medical attention if they experience persistent back pain that improves with activity, morning stiffness lasting more than 30 minutes, or limited flexibility in the spine.

Early detection of ankylosing spondylitis in Singapore allows for timely interventions that can slow disease progression and reduce complications. Seeking help as soon as these warning signs appear ensures better outcomes and access to comprehensive care tailored to each patient’s needs.

Find an Ankylosing Spondylitis Specialist/Rheumatologist in Singapore

You do not have to manage ankylosing spondylitis alone. A specialist can help assess your ankylosing spondylitis symptoms, confirm your diagnosis, adjust medication and provide guidance for managing your condition. 

If you or someone you love has persistent back pain, stiffness or other ankle spondylitis symptoms, book a consultation to get clear answers. 

Take the first step toward stable health and peace of mind.

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