What Is Inflammatory Arthritis, and How Is It Different From Wear and Tear?
Inflammatory arthritis is a group of conditions in which the immune system attacks healthy joint tissue. This causes pain, swelling and stiffness. It is very different from osteoarthritis, which is caused by slow mechanical wear. Diagnosis usually depends on blood tests and an assessment by a rheumatologist, not on scans alone. Even so, the joint damage it causes can change how your whole body lines up when you stand.
Key points
- Inflammatory arthritis is driven by the immune system. It is not simple wear and tear.
- Morning stiffness that lasts more than an hour is a typical sign.
- Blood tests (CRP, ESR, rheumatoid factor) and referral to a rheumatologist are the main ways to diagnose it.
- Joint damage from inflammation can change your posture and alignment over time.
- A standing whole-body scan can show how affected joints change the way weight passes through your spine, hips and knees.
What are the symptoms of inflammatory arthritis?
The typical symptoms are joint pain, swelling and long-lasting stiffness, especially first thing in the morning. Wear-and-tear arthritis tends to hurt more after activity. Inflammatory arthritis, on the other hand, often feels worst after rest and eases with movement.
Joints feel locked or gummy for 60 minutes or more after you wake up. This is one of the clearest clues.
Both wrists, both knees, or matching small joints swell at the same time. This pattern suggests an immune process.
Because it is a systemic condition, you may feel drained, run down or feverish along with the joint symptoms.
Pain that disturbs your sleep, especially in the second half of the night, is more typical of inflammation than of mechanical wear.
If you notice several of these at once, it is worth speaking to your doctor sooner rather than later. Early treatment with the right medicine can make a real difference.
What are the main types of inflammatory arthritis?
There are several types of inflammatory arthritis. Each is driven by the immune system, but each affects the body in slightly different ways.
Rheumatoid arthritis is the best known. It tends to affect smaller joints on both sides, such as both hands or both feet. It is usually confirmed with blood markers such as rheumatoid factor and anti-CCP antibodies.
Psoriatic arthritis occurs in some people with the skin condition psoriasis, though the joint symptoms sometimes appear first. It can affect larger joints, the spine and the fingers, and blood tests may come back negative. This makes it a seronegative arthritis, meaning the standard markers are absent even though inflammation is active.
Axial spondyloarthritis (including ankylosing spondylitis) mainly targets the spine and the sacroiliac joints. It often begins in younger adults and can lead to major changes in posture over time. You can read more about general spinal wear and stiffening on our spondylosis page.
Other inflammatory types include gout (caused by crystal deposits), reactive arthritis and joint inflammation linked to lupus.
How is inflammatory arthritis different from osteoarthritis?
The main difference is the cause. Osteoarthritis is mechanical. Cartilage wears down over time through use, injury or load. Inflammatory arthritis is driven by the immune system. The body mistakenly attacks its own joint lining. This causes swelling and damage, even in joints that have not been overused.
Cause: The immune system attacks the joint lining (synovium).
Pattern: Often on both sides, affecting matching joints.
Stiffness: Worst in the morning, lasts more than an hour, and gets better with movement.
Whole-body signs: Tiredness, raised inflammation markers in the blood (CRP, ESR), sometimes fever.
Age it starts: Can start at any age, including in your twenties or thirties.
Cause: Slow loss of cartilage from use, load or an earlier injury.
Pattern: Usually on one side, or limited to joints that are used heavily.
Stiffness: Short, usually under 30 minutes, and worse after activity.
Whole-body signs: Rare. Blood tests are usually normal.
Age it starts: More common from middle age onwards, though it can follow an earlier injury. In the spine, you may know this as facet joint arthropathy.
Both conditions can cause lasting changes in structure. Both can change how weight is spread through your spine, pelvis, hips and knees. That is where alignment imaging becomes relevant.
How is inflammatory arthritis diagnosed?
Inflammatory arthritis is mainly diagnosed through a clinical assessment and blood tests, not scans. Your doctor or a rheumatologist will look at your symptoms, examine your joints, and order blood tests to check markers such as CRP, ESR, rheumatoid factor and anti-CCP antibodies.
It is important to be clear: imaging alone cannot diagnose inflammatory arthritis. An X-ray or an EOS scan cannot tell you whether your immune system is attacking your joints. That is a question for blood tests and a rheumatologist's opinion. If your doctor suspects an inflammatory type, they should refer you to a rheumatologist. Early treatment with disease-modifying drugs (known as DMARDs) can slow joint damage and protect your quality of life.
Some forms, such as psoriatic arthritis and other seronegative types, may have normal blood test results. In these cases, the clinical picture, your history of symptoms and sometimes an MRI of the affected joints help the specialist reach a diagnosis.
When is MRI the better choice? EOS shows bones, joints and alignment very well. But for soft tissue, disc problems, pressure on nerves or early inflammatory changes in the joint lining, MRI is usually the better choice. If your rheumatologist needs to see early synovitis or bone marrow oedema, they will likely request an MRI.
How does inflammatory arthritis affect your posture and alignment?
Over time, joint damage from inflammation can change the way you stand. A stiff hip may make you lean. An inflamed knee may shift your weight to the other leg. A fused segment in the spine may flatten your natural curves. Your body is a connected chain from feet to head, and a problem in one area forces another area to make up for it. The pain you feel may not be where the original damage is.
Standard scans, whether X-ray, CT or MRI, are usually done lying down. When you lie flat, gravity is removed and your muscles relax. Misalignments that cause problems when you are upright and bearing weight may simply disappear on the image. This is why a standing whole-body scan can add useful information that lying-down scans miss.
ScanAlign standing EOS imaging captures your whole skeleton from head to feet in one upright exposure, using about 90% less radiation than a standard X-ray, around ten times less. It cannot diagnose the inflammatory process itself. That is the job of blood tests and a rheumatologist. But it can show clearly how joint damage has changed your alignment, where your body is compensating, and which areas are under the most strain. That information helps your treating team plan the right next step.
Before you start treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.
If you have been diagnosed with inflammatory arthritis and want to understand how it has affected your alignment, a standing assessment at our London clinic can give you that picture.
Book a free video consultationFor more on how back pain and spinal conditions are assessed, see our back pain clinic page.
When should you get urgent medical help?
Most inflammatory arthritis symptoms develop slowly. However, if you have sudden severe joint swelling with fever, unexplained numbness or weakness in your arms or legs, or any loss of bladder or bowel control, do not wait for a scan or a routine appointment. Contact your doctor or go to your nearest emergency department straight away. These symptoms need urgent assessment.
Frequently asked questions
The main clues are the pattern and the timing. Inflammatory arthritis usually causes morning stiffness that lasts more than an hour, swelling of joints on both sides, and tiredness. Wear-and-tear arthritis tends to hurt more after activity and affects joints that have been heavily used. Blood tests for CRP, ESR and rheumatoid factor help your doctor or rheumatologist tell the difference.
No. Imaging can show joint damage, bone erosion or changes in alignment, but it cannot confirm that your immune system is driving the problem. Diagnosis depends on blood tests and a clinical assessment by a rheumatologist. Imaging is a supporting tool, not the main way to diagnose this condition.
Seronegative means the standard blood markers (rheumatoid factor, anti-CCP) come back negative, even though you have active inflammatory arthritis. Psoriatic arthritis and axial spondyloarthritis are common seronegative types. In these cases, diagnosis depends more on symptoms, a clinical examination and sometimes MRI.
The most common are CRP (C-reactive protein) and ESR (erythrocyte sedimentation rate), which measure general inflammation. There are also rheumatoid factor and anti-CCP antibodies, which are more specific to rheumatoid arthritis. Your doctor can order these.
Over time, joint damage can stiffen or deform joints in the spine, hips and knees. Your body makes up for this by shifting weight and adjusting its curves. This can cause pain in areas far from the original damage. A standing whole-body scan shows this pattern clearly.
When you lie down, gravity is removed and your muscles relax. Alignment problems that cause trouble when you are upright and bearing weight can disappear from the image. A standing scan captures your skeleton under real-life load, giving a clearer picture of how your joints actually work.
Yes. EOS uses about 90% less radiation than a standard X-ray, around ten times less. It captures a full-body image in a single low-dose exposure.
No. You can book yourself. The process starts with a free video consultation, where a specialist radiographer reviews your situation and confirms whether a standing scan is suitable for you.
The price for patients travelling from abroad is confirmed during the free video consultation, which you can arrange on the book a standing assessment page.
EOS is excellent for bones, joints and alignment. For soft tissue, discs, nerves or early inflammatory changes in the joint lining, MRI is usually the better tool. Your consultant or rheumatologist can advise which scan is right for you, and in many cases both can be useful.
Understand how arthritis has changed your alignment
A free video consultation with a specialist radiographer will help you find out whether a standing whole-body scan in London is the right next step for you.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- National Institute for Health and Care Excellence (NICE). Rheumatoid arthritis in adults: management (NG100). 2018, updated 2020.
- NHS. Overview: Rheumatoid arthritis. nhs.uk/conditions/rheumatoid-arthritis. Accessed 2024.
- Smolen JS, Aletaha D, McInnes IB. Rheumatoid arthritis. The Lancet. 2016;388(10055):2023-2038.
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.