How Does Imaging Support Rheumatology Assessment?
Rheumatology assessment relies on different imaging tools for different questions. MRI detects active inflammation such as sacroiliitis and bone marrow oedema. Standing whole-body imaging adds structural context, capturing sagittal balance, spinal mobility changes and the mechanical consequences of disease under weight-bearing conditions that lying-down scans cannot show.
Key takeaways
- MRI remains the standard for detecting active inflammation in axial spondyloarthritis. EOS imaging does not replace it.
- Standing EOS imaging shows structural change, whole-spine alignment and sagittal parameters under real weight-bearing load.
- Low-dose serial imaging allows you to monitor spinal disease progression over time with about 90% less radiation than a standard X-ray.
- Reports include full sagittal measurements and can be shared directly with the referring rheumatologist.
- No GP referral is needed. You can register to refer patients directly.
What is MRI's role in rheumatology imaging?
MRI is the primary tool for detecting active inflammation. In axial spondyloarthritis, MRI of the sacroiliac joints can identify bone marrow oedema and early sacroiliitis before structural damage appears on conventional radiographs. It is also essential for assessing soft tissue, discs and nerves.
Important clarity on what EOS does and does not do. EOS imaging shows bones, joints and structural alignment. It does not detect active inflammation, bone marrow oedema or soft-tissue disease. For those questions, MRI is usually the better tool. We are transparent about this because the two modalities answer different clinical questions, and both may be needed.
Where standing imaging adds value is in the structural questions MRI cannot easily answer, particularly global spinal alignment, load-bearing posture and how disease affects the whole kinetic chain from pelvis to skull.
Why does standing imaging matter for spinal disease?
Standing imaging captures the spine under the load of gravity, which is how your patient actually lives. Lying-down MRI and CT relax the paraspinal muscles and temporarily flatten compensatory curves. This means supine imaging can underestimate the true extent of sagittal imbalance, kyphosis progression or pelvic compensation.
What you see: True weight-bearing alignment from head to feet in a single calibrated image. Full sagittal parameters including pelvic incidence, sacral slope, lumbar lordosis and thoracic kyphosis. Compensatory mechanisms such as pelvic retroversion, knee flexion and cervical hyperextension are visible because the patient is standing naturally.
What you see: Excellent soft-tissue contrast, inflammation and disc detail. However, gravity is removed. Compensatory postures relax, kyphotic deformity may appear less severe, and the relationship between the pelvis and spine is not loaded. Global alignment from feet to skull is not captured in a single acquisition.
The EOS system uses slot-scanning biplanar technology with about 90% less radiation than a standard X-ray, around ten times less. This makes it practical for serial imaging to monitor structural change over months or years without cumulative dose concerns.
How can rheumatologists use standing alignment data?
Standing whole-body imaging provides clinical data that complements your MRI and blood work. Below are the most common rheumatology referral scenarios we see.
Document sagittal parameters at diagnosis to establish a structural reference point before starting biologics or other therapies.
Serial low-dose scans track kyphosis, loss of lumbar lordosis and sagittal vertical axis shift over time, supporting clinical correlation with disease activity scores.
When a patient with ankylosing spondylitis is being considered for corrective osteotomy, the surgeon needs standing full-spine imaging with pelvic parameters.
Weight-bearing sacroiliac imaging shows joint space changes, ankylosis and structural fusion, complementing MRI findings of active inflammation.
What is the rheumatology referral pathway for standing imaging?
The referral process is straightforward. No GP letter is needed. Rheumatologists can refer directly.
Register with ScanAlign
Complete a short one-time registration so we can link reports to your practice. You can register to refer patients online.
Submit a referral
Send your clinical question and the patient's details. Specify the regions of interest and any sagittal parameters you need.
Patient attends for imaging
The scan takes place at 19 Harley Street, London. The whole-body standing acquisition takes only a few seconds, with about 90% less radiation than a standard X-ray.
Shared reporting
The report, including full sagittal parameter measurements, is sent directly to you for clinical correlation with your disease activity assessments and MRI findings.
Which rheumatology patients benefit from standing imaging?
Standing whole-body imaging is most useful when structural alignment or mechanical change is part of the clinical question. It is not a replacement for MRI when inflammation is the primary concern.
- Established axial spondyloarthritis, tracking structural change
- Pre-operative planning for spinal osteotomy
- Monitoring kyphosis progression or loss of lordosis
- Assessing compensatory pelvic or lower-limb changes
- Serial imaging where cumulative radiation dose matters
- Suspected early sacroiliitis with no structural changes yet
- Detecting active bone marrow oedema or enthesitis
- Assessing soft-tissue inflammation or nerve compression
- Diagnosis of inflammatory arthritis where imaging shows early inflammation only
Want to discuss whether standing imaging would add value for a specific patient? We are happy to talk through the clinical question first.
Refer a patientFrequently asked questions about rheumatology imaging referrals
No. EOS imaging shows bone structure, joint spaces and alignment. It does not detect active inflammation, bone marrow oedema or soft-tissue swelling. MRI is the appropriate tool for those findings.
EOS uses about 90% less radiation than a standard X-ray, around ten times less. This is particularly relevant for serial imaging in chronic conditions where cumulative dose is a concern.
No. Rheumatologists and other specialists can refer directly. Self-referred patients can also attend. There is no need for a GP letter.
The report includes pelvic incidence, sacral slope, pelvic tilt, lumbar lordosis, thoracic kyphosis, sagittal vertical axis and other relevant measurements. These are calibrated from a weight-bearing, full-body acquisition.
Yes. Because the dose is so low, serial scans can be repeated at intervals to monitor structural changes such as increasing kyphosis, loss of lordosis or progressive sacroiliac fusion, without significant cumulative radiation exposure.
It is useful for structural assessment of the sacroiliac joints, including joint space narrowing, erosions and ankylosis. However, it does not show active inflammation. MRI remains the standard for detecting early sacroiliitis.
The standing acquisition itself takes only a few seconds. The entire appointment, including positioning and any additional views, is typically brief and straightforward for the patient.
You can complete a short online registration. Once registered, you can submit referrals and receive reports directly.
ScanAlign, low dose standing imaging, is located at 19 Harley Street, London. It operates under The Harley Street Hospital's CQC licence.
ScanAlign is a private, self-pay clinic. Pricing details are not listed on this page. Please contact us directly or ask during the referral process for current fees.
Ready to refer a patient for standing imaging?
Register once, then send referrals directly. Reports include full sagittal parameters and are shared with you for clinical correlation.
Written by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- Sieper J, Poddubnyy D. Axial spondyloarthritis. The Lancet. 2017;390(10089):73-84.
- National Institute for Health and Care Excellence (NICE). Spondyloarthritis in over 16s: diagnosis and management (NG65). 2017.
- Dubousset J, Charpak G, Dorion I, et al. A new 2D and 3D imaging approach to musculoskeletal physiology and pathology with low-dose radiation in standing position: the EOS system. Bulletin de l'Académie Nationale de Médecine. 2005;189(2):287-300.
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.