Health condition
Transient osteoporosis of the hip
Transient osteoporosis of the hip is a self-limiting condition in which the femoral head suddenly loses mineral and the marrow becomes oedematous, causing severe hip pain - classically in middle-aged men or women in late pregnancy - that resolves completely within months.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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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.
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Abrupt or rapidly escalating hip and groin pain with weight-bearing, without injury; examination shows painful restriction but X-rays may look normal early
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MRI shows diffuse bone marrow oedema of the femoral head and neck without the focal changes of avascular necrosis - the key distinction
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Classic groups: men aged 40-60 and women in the third trimester of pregnancy; the condition resolves fully in 6-12 months
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Management: protected weight-bearing (crutches) to prevent fracture through the weakened bone, analgesia and graded return - with monitoring to confirm resolution
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
The condition behaves like a temporary regional crisis of bone metabolism: mineral drains from the femoral head over weeks, the marrow swells, and every step hurts - yet unlike avascular necrosis, the process reverses itself completely, remineralising without structural damage provided the weakened bone is not fractured in the meantime. In pregnancy it poses particular diagnostic anxiety, though MRI without contrast is safe and diagnostic.
Diagnosis and treatment routes
Specialist assessment matters chiefly to secure the diagnosis against its serious mimics - early AVN, stress fracture, infection and tumour - using MRI patterns and follow-up imaging that shows steady improvement. Treatment is patience with protection: crutches during the painful phase, adequate calcium and vitamin D, analgesia, and physiotherapy as pain recedes; bisphosphonates are sometimes used off-label to shorten symptoms, and recurrence in another joint (regional migratory osteoporosis) is uncommon but recognised. 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 consultant orthopaedic surgeon or metabolic bone specialist. 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 Transient osteoporosis of the hip.
Quick, plain-English answers to what people ask us most.
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What is transient osteoporosis of the hip?
It is a rare, temporary condition causing bone marrow swelling and localised thinning of bone in the hip joint, leading to pain and reduced bone density that resolves over months without treatment in most cases.
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What causes transient osteoporosis of the hip?
The exact cause is unclear, but it is thought to relate to temporary changes in blood flow to the hip bone; it occurs more often in pregnant women in the third trimester and middle-aged men.
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What are the symptoms?
Progressively worsening hip or groin pain, often worse with weight-bearing, and sometimes a limp, developing over days to weeks without a clear injury to explain it.
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Is transient osteoporosis of the hip dangerous?
It usually resolves on its own without permanent damage, but the temporarily weakened bone carries a small risk of hip fracture, so weight-bearing is often restricted until healing is confirmed.
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Is it hereditary?
No, it is not considered an inherited condition; it appears to be a temporary, localised change in bone blood supply rather than a genetic bone disease.
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Can it be cured or does it resolve by itself?
Yes, it is typically self-limiting, with bone density and pain gradually improving over six to twelve months, though pain relief and reduced weight-bearing help manage symptoms in the meantime.
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How is it treated?
Treatment is mainly supportive: pain relief, use of crutches to protect the hip from fracture, and sometimes bisphosphonate medication in more severe or slow-resolving cases.
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How long does it take to recover?
Most people see gradual improvement over several months, with full resolution of bone changes typically within six to twelve months, confirmed by repeat imaging.
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Transient osteoporosis vs avascular necrosis - what's the difference?
Transient osteoporosis resolves fully with bone recovering normally, while avascular necrosis involves bone death that can progress to permanent joint damage and may need surgery; imaging helps distinguish the two.
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When should I see a doctor about hip pain, and how quickly can I be seen privately?
See a doctor if hip pain is worsening or affecting walking, especially in pregnancy or middle age without injury. NHS orthopaedic waits can be 20-45+ weeks, while private orthopaedic consultants can often see you within about two weeks.