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What is AS?

Last updated: 06-23-2020

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What is AS?

It comes under the umbrella term of Axial Spondyloarthritis which includes:

Where changes to the sacroilliac joints and /or the spine can be seen on x-ray.

Where x-ray changes are not present but you have symptoms.

Up to 70% of people with non-radiographic axial spondyloarthritis have visible inflammation in the sacroiliac joints and/or the spine when an MRI of the back is done. Inflammation is the body's reaction to injury or irritation, and can cause redness, swelling and pain.

30% of people in this group may not have any change visible on the MRI despite symptoms of back pain. In fact some of these patients may never show any inflammation on an MRI even if this is repeated later on in life. The reasons for this are still not well understood but may be due to how sensitive our methods to image the joints are.

 Download our leaflet for more information on axial spondyloarthritis.

Many people have simply been told that they have ankylosing spondylitis, rather than axial spondyloarthritis or non-radiographic axial spondyloarthritis. Whichever diagnosis you have been given, all the information on the NASS website will be relevant to you and your condition.

It's a painful, progressive form of inflammatory arthritis. It mainly affects the spine but can also affect other joints, tendons and ligaments.

Other areas such as the eyes and bowel can also sometimes be involved with AS.

The effects are different for everyone. Some people AS have virtually no symptoms whereas others suffer more severely.

Spondylitis and spondylosis are two conditions which sound very similar but are actually very different.

Spondylosis is a medical term for the general wear and tear that occurs in the joints and bones of the spine as people get older.

Cervical spondylosis specifically refers to wear and tear occuring in the neck (the cervical spine). You can find really useful information on cervical spondylosis on the NHS Choices website.


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