When Should a Pain Consultant Look Beyond a Normal Scan?
When chronic pain persists despite a normal MRI or CT, standing whole-body imaging can reveal load-dependent alignment problems that only appear under the patient's own body weight. Lying-down scans relax muscles and remove gravity, potentially hiding the structural contributor. A second look under weight-bearing conditions does not replace MRI. It adds a different, sometimes missing, piece of the diagnostic picture.
Key takeaways
- A "normal" lying-down scan does not rule out a postural or load-dependent structural cause.
- Pain that worsens with standing, walking or prolonged postures is a clinical clue worth investigating upright.
- Standing whole-body EOS imaging captures alignment from head to feet in a single exposure, with about 90% less radiation than a standard X-ray.
- Many chronic pain presentations are not explained by any structural finding, and imaging should only be requested when there is a clear clinical question.
- ScanAlign provides shared reporting so findings integrate into existing pain management plans.
Why does a normal MRI not always explain chronic pain?
A normal MRI means the scan did not find a lesion, disc herniation, tumour or inflammatory process within the area imaged. It does not mean there is no structural contributor to the patient's pain. MRI and CT are performed lying down. In that position, the spine decompresses, the pelvis settles into a neutral position, and the muscles that normally hold the body upright are relaxed. Any alignment problem that depends on gravity and load is effectively switched off during the scan.
This matters because the patient's pain usually occurs when they are upright, walking, standing or sitting. If the problem is positional, the lying-down image may appear entirely normal. The scan answered one question well, but a different question was never asked.
For a deeper look at this gap, read about when an MRI shows nothing but the pain remains.
What clinical clues suggest a load-dependent structural cause?
Certain patterns in the history and examination raise the likelihood that a postural or biomechanical component is contributing to persistent pain. These are not diagnostic on their own, but they point towards a question that lying-down imaging cannot answer.
Pain that worsens with standing or walking and improves when the patient lies down or changes position.
Knee, hip or thoracic pain that does not match a single structural lesion, suggesting a compensation pattern further along the chain.
Observable leg length discrepancy, lateral trunk shift, or pelvic obliquity on clinical examination.
Persisting pain after spinal, hip or knee surgery where regional imaging looks satisfactory but global alignment was never assessed.
The body is a connected chain from feet to head. A problem at one level can make another area compensate, which means the site of pain is not always the site of the cause. Regional imaging captures a single area well. Whole-body standing imaging shows how everything lines up together.
How does standing whole-body imaging differ from conventional scans?
Standing whole-body EOS imaging captures the full skeleton from head to feet in a single weight-bearing exposure. Because the patient is upright, the image reflects the real mechanical environment in which their pain occurs. Gravity, muscle tone and compensation patterns are all present in the image rather than removed by a supine position.
What it shows: Detailed view of one body area (e.g. lumbar spine, single knee). Excellent for identifying disc herniations, fractures, tumours and inflammatory changes within that region.
What it may miss: How that area relates to the rest of the skeleton under load. A "normal" lumbar MRI cannot tell you whether the pelvis is tilted, the legs are unequal, or the thoracic spine is compensating.
What it shows: Full skeletal alignment from head to feet, all in one standing image. Pelvic obliquity, sagittal balance, limb length discrepancy and compensatory curves are all visible and measurable.
What it does not show: Soft tissue detail. It will not identify a disc herniation, nerve root compression, ligament tear or inflammatory process. For those questions, MRI remains the right tool.
EOS uses about 90% less radiation than a standard X-ray, around ten times less. That lower dose makes it practical for full-body imaging without the radiation burden of stitched full-spine plain films. A detailed alignment report with measurements is provided, designed to sit alongside existing MRI or CT findings so the full picture is available to the treating team.
When will further imaging not help a chronic pain patient?
Not every patient with unexplained pain has a structural cause waiting to be found. It is important to be clear about the limits of any imaging modality, including standing whole-body imaging.
- Pain is clearly positional or load-dependent
- Clinical examination suggests asymmetry or postural imbalance
- Regional imaging is normal but a structural question remains
- Pre-surgical planning needs full alignment context
- Post-surgical pain persists despite satisfactory regional imaging
- Pain is predominantly driven by central sensitisation without a plausible structural component
- The clinical picture is primarily psychological or social
- Repeated normal imaging has already been discussed and the patient needs reassurance, not more scans
- Red flags (neurological deficit, unexplained weight loss, suspected malignancy) require urgent MRI or other targeted investigation
Overclaiming what any scan can offer risks reinforcing unhelpful illness beliefs. Standing alignment imaging is one additional tool. It answers a specific structural question that lying-down imaging cannot, but it is not appropriate for every chronic pain presentation.
A note on MRI: EOS shows bones, joints and alignment under load. For soft tissue, discs or nerves, MRI is usually the better tool. The two are complementary. An EOS alignment report works best when read alongside existing MRI or CT findings.
How can a pain consultant refer a patient for standing imaging?
Referral to ScanAlign, whole-body standing imaging at 19 Harley Street, London, is straightforward. The service is self-pay, so no insurance pre-authorisation is needed, though some insurers do cover the scan.
Register your clinic
Complete a short form to register to refer patients. This only takes a moment and allows us to share reports directly with you.
Submit a referral
Once registered, you can refer a patient online. Include any relevant clinical history or imaging already performed.
Patient attends
The scan takes place standing up. It captures the full skeleton in a single low-dose exposure. There is no contrast injection and no enclosed scanner.
Shared reporting
A detailed alignment report with measurements is sent to you and the patient. Findings are designed to integrate into your existing management plan.
Patients can also self-refer directly. They begin with a free video consultation to check the scan is appropriate for their situation.
Book a free video consultationFrequently asked questions
EOS is a low-dose standing X-ray system that captures the full skeleton from head to feet in one exposure. Unlike conventional X-rays, which image a single region lying down, EOS produces a weight-bearing whole-body image with about 90% less radiation than a standard X-ray, around ten times less.
MRI is performed lying down, which removes gravity and relaxes muscles. Load-dependent alignment problems, such as pelvic obliquity, sagittal imbalance or functional leg length discrepancy, may not be visible in that position. The MRI answered its question well, but the positional question was never asked.
No. It is most useful when there is a clinical suspicion of a load-dependent structural contributor. Patients whose pain is primarily driven by central sensitisation, psychological factors, or where repeated normal imaging would reinforce unhelpful beliefs are unlikely to benefit.
No. EOS shows bones, joints and skeletal alignment. For soft tissue detail, disc herniations or nerve root compression, MRI remains the appropriate investigation. The two are complementary.
EOS uses about 90% less radiation than a standard X-ray, around ten times less. This makes full-body imaging practical without the cumulative dose concerns of stitched plain-film series.
Register your clinic online, then submit referrals through a short form. Patients can also self-refer and begin with a free video consultation to check suitability. The service is self-pay, though some insurers cover the scan.
Current pricing information is available on the ScanAlign FAQs page. The service is self-pay, and some patients may be able to claim through their health insurer.
Yes. A detailed alignment report with measurements is produced and shared with both you and the patient. It is designed to sit alongside existing MRI or CT findings, giving you the full structural picture.
Yes. No GP or consultant referral is needed. Patients can book a free video consultation directly to discuss whether standing imaging is appropriate for their situation.
ScanAlign is at 19 Harley Street, London, within The Harley Street Hospital. The clinic operates under the hospital's CQC licence.
A second look, standing up
When lying-down imaging leaves a structural question unanswered, standing whole-body EOS imaging can provide the missing context for your pain management plan.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- Illés, T. & Somoskeöy, S. (2012). The EOS imaging system and its uses in daily orthopaedic practice. International Orthopaedics, 36(7), 1405-1411.
- Roussouly, P. & Pinheiro-Franco, J.L. (2011). Biomechanical analysis of the spino-pelvic organisation and adaptation in pathology. European Spine Journal, 20(Suppl 5), 609-618.
- National Institute for Health and Care Excellence (NICE). Low back pain and sciatica in over 16s: assessment and management (NG59).
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.