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Health condition

CRMO in adults

Chronic recurrent multifocal osteomyelitis (CRMO) - sterile, relapsing bone inflammation usually described in children - can persist into or first present in adulthood, where it overlaps with SAPHO syndrome; whole-body MRI and pattern recognition prevent repeated fruitless biopsies.

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against current NHS and UK specialist society guidance at the time of review.

  • 03

    Current for 2026

    Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.

Key facts

The essentials at a glance.

The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.

  • Recurrent episodes of bone pain and swelling with imaging evidence of osteitis, negative cultures and no organism - inflammation, not infection

  • Typical sites: collarbone, long-bone metaphyses, pelvis, spine and mandible; lesions are often multifocal and asynchronous

  • Whole-body MRI is the key investigation - it maps silent lesions, supports the diagnosis and tracks treatment response

  • NSAIDs are first line; bisphosphonates (especially for spinal lesions), methotrexate and TNF inhibitors treat persistent disease

Understanding the condition

What it is and what happens next.

What causes it, how it is diagnosed, and the treatment routes available in the UK.

What it is and how it feels

CRMO is an autoinflammatory disease of bone: the innate immune system attacks the skeleton episodically, producing lesions that mimic infection or tumour closely enough that most patients have at least one biopsy before the pattern is recognised. In adults the distinction from SAPHO is largely semantic - many rheumatologists regard them as one spectrum - and the practical issues are identical: relapsing pain, vertebral lesions that can fracture, and years of diagnostic delay.

Diagnosis and treatment routes

The diagnostic approach pairs whole-body MRI with a careful review of previous biopsies and cultures (sterile, chronic inflammation), inflammatory markers that may be only modestly raised, and exclusion of differentials including infection and malignancy where imaging is atypical. Long-acting NSAIDs settle a good proportion; intravenous bisphosphonates protect and treat spinal disease, and methotrexate or TNF blockade brings most refractory cases under control, with flares monitored clinically rather than by repeated scanning. In much of the UK, a routine NHS referral to the relevant specialist clinic can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.

Seeing a specialist

Who to see, and how quickly you can be seen.

The specialist for this condition is usually a rheumatologist with metabolic bone input. Your GP can refer you on the NHS, or you can arrange a private consultation directly.

A quiet reminder

This guide is for information, not medical advice.

Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.

Frequently asked

Common questions about CRMO in adults.

Quick, plain-English answers to what people ask us most.

  • What is CRMO in adults?

    Chronic recurrent multifocal osteomyelitis (CRMO) is a sterile (non-infectious), relapsing inflammatory bone condition usually described in children, but which can also occur in, or persist into, adulthood.

  • What causes CRMO?

    CRMO is thought to be an autoinflammatory condition, where the immune system triggers bone inflammation without an infectious cause, though the exact mechanism isn't fully understood. It can occur alongside other inflammatory conditions like psoriasis or inflammatory bowel disease.

  • What are the symptoms of CRMO in adults?

    Symptoms typically include bone pain and swelling, often affecting multiple sites over time, with a relapsing and remitting pattern rather than a single continuous episode.

  • Is CRMO dangerous?

    CRMO itself is not life-threatening, but ongoing bone inflammation can cause chronic pain and, in some cases, structural bone changes if not properly managed, so it should be assessed and monitored by a specialist.

  • How is CRMO diagnosed?

    Diagnosis usually involves imaging (such as MRI or whole-body MRI to find all affected sites) alongside blood tests and sometimes bone biopsy to rule out infection or other conditions like malignancy, since CRMO is essentially a diagnosis made by excluding these alternatives.

  • How is CRMO treated?

    Treatment often starts with anti-inflammatory medications (NSAIDs), with bisphosphonates or other immune-modulating treatments used for more persistent or severe cases, tailored by a rheumatologist based on response.

  • Can CRMO be cured?

    CRMO can't always be definitively cured, but it can often be well controlled with treatment, and some people experience long periods of remission, particularly with appropriate ongoing management.

  • How long does CRMO last?

    The course varies significantly between individuals - some people have a few relapsing episodes over a limited period, while others experience a more chronic, longer-term pattern requiring ongoing treatment and monitoring.

  • CRMO vs osteomyelitis from infection - what's the difference?

    Standard osteomyelitis is caused by a bacterial (or occasionally fungal) infection and is treated with antibiotics, whereas CRMO is sterile and inflammatory rather than infectious, and is treated with anti-inflammatory or immune-modulating medication instead.

  • When should I see a specialist about possible CRMO?

    See a rheumatologist if you have recurrent, unexplained bone pain, particularly at multiple sites over time. A private rheumatology consultation is often available within about two weeks, compared with potentially longer NHS waiting times for this relatively rare condition.