Health condition · Clinically reviewed
Calcaneal stress fracture, the missed cause of heel pain in runners and military recruits.
A stress fracture of the calcaneus (heel bone) — a commonly missed cause of persistent heel pain in runners and military recruits. Diagnosed on MRI; treated with non-weight-bearing rest and structured return-to-run.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced from guidance
Every claim is checked against BOFAS, NICE and specialist sports medicine sources you can see at the end.
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Current for 2026
Reflects current UK guidance on stress-fracture diagnosis, offloading and return-to-run rehabilitation.
Key facts
Calcaneal stress fracture at a glance.
The essentials, in plain English — what a calcaneal stress fracture is, why X-rays miss it early, and why MRI is the investigation of choice.
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Definition
A calcaneal stress fracture is a stress or fatigue fracture of the calcaneus (heel bone) from repetitive impact loading.
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Who gets it
Common in runners, military recruits and dancers — anyone with a sudden increase in weight-bearing training load.
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Not plantar fasciitis
Important to distinguish from plantar fasciitis and a simple heel spur — the treatment and timeline are very different.
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Squeeze test
Compressing the heel from both sides (the squeeze test) reliably reproduces the pain — a useful bedside pointer.
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MRI is definitive
MRI is the investigation of choice — early X-rays are frequently normal even when a stress fracture is present.
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Bone-health matters
Screen for underlying bone-health risk factors — RED-S, low bone density and menstrual dysfunction in athletes.
Why this guide matters
Get the diagnosis right, offload properly.
A calcaneal stress fracture is frequently mistaken for plantar fasciitis — this guide sets out how to spot the difference and why MRI matters.
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Not every heel pain is fasciitis
A positive heel squeeze test and pain on impact loading in a runner or recruit should raise the possibility of a stress fracture.
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A normal X-ray does not exclude it
Early X-rays are frequently normal — MRI shows the bone marrow oedema and fracture line long before X-ray changes appear.
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Bone health is part of the diagnosis
Screen for RED-S, low bone density and menstrual dysfunction — treating those prevents the next stress fracture, not just this one.
How the diagnosis is made
From painful heel to a clear plan.
The steps a UK GP or sports medicine clinician will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
History, squeeze test and first-line X-ray
Phase 2 · Confirming
MRI and bone-health screening
Phase 3 · Managing
Sports medicine and return-to-run
- 01
Recognising
Training and activity history
The story does most of the work — a recent, rapid increase in running mileage, marching or impact loading is the classic set-up.
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Recognising
Heel squeeze test
Compressing the calcaneus from both sides reproduces the pain — a simple, reliable bedside pointer to a stress fracture.
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Recognising
Weight-bearing X-ray
Reasonable first-line imaging, but often normal in the first two to three weeks — a normal X-ray does not exclude a stress fracture.
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Confirming
MRI foot
The investigation of choice — bone marrow oedema and a fracture line confirm the diagnosis long before X-ray changes appear.
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Confirming
Bone density (DEXA)
Considered if stress fractures are recurrent or occur with modest training loads — screening for low bone mineral density.
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Managing
Nutritional and hormonal review
Assess energy availability, menstrual status and vitamin D — RED-S is a common and treatable driver in athletes.
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Managing
Foot and ankle sports medicine
Specialist review guides offloading, return-to-run programming and, in rare cases, surgical fixation of displaced fractures.
Typical timeline: 2–4 weeks from first appointment to a confirmed diagnosis and plan.
Symptoms
What a calcaneal stress fracture actually feels like.
Impact-related heel pain in a runner or recruit, with a positive squeeze test — the classic pattern that separates it from plantar fasciitis.
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Heel pain worse on impact
Deep, aching heel pain that sharpens with every running step or heel strike — the hallmark of a stress fracture.
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Positive squeeze test
Compressing the heel from both sides reliably reproduces the pain — different from the pin-point plantar tenderness of fasciitis.
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Pain on landing or running
Jumping, hopping or a single-leg heel strike reproduces symptoms — activity-related loading is the trigger.
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Local swelling
Subtle swelling or warmth around the heel can be present, especially after running or a long day on your feet.
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Recurrent symptoms
Pain that keeps returning as soon as training resumes — a strong pointer to an unhealed or evolving stress fracture.
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Improved with rest
Symptoms reliably ease with a few days off impact loading and flare again on return — the classic stress-fracture pattern.
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Sudden increase in training load
A recent spike in mileage, new hill sessions, a marching phase or a change of surface is the usual precipitant.
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Red flag
Displaced calcaneal fracture with heel deformity or inability to weight-bear — needs urgent orthopaedic surgical review.
Treatment
How calcaneal stress fracture is treated in the UK.
Offloading first, then address the training-load error, fuelling and bone health — followed by a structured, staged return-to-run.
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Non-weight-bearing / walking boot
Offloading for four to six weeks in a walking boot or with crutches is the mainstay — the bone will not heal while it is still being loaded.
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Address training-load errors
Review the mileage spike, hill work or surface change that triggered it — return-to-run only works if the original error is corrected.
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Nutrition, vitamin D and calcium
Optimise energy availability, vitamin D and calcium intake — under-fuelled athletes do not heal stress fractures on time.
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Bone density (DEXA) if recurrent
DEXA scanning if stress fractures are recurrent or the training load was modest — to identify low bone mineral density.
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Physiotherapy graded return to running
A structured, incremental return-to-run programme — starting with walking, then jog-walk, then continuous easy running over several weeks.
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Gait analysis and cushioned shoes
Gait assessment and a move to a more cushioned running shoe can reduce peak heel loading during return-to-run.
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Bone stimulator (specialist)
A pulsed ultrasound or electromagnetic bone stimulator is occasionally used in delayed union — under specialist supervision.
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Surgical fixation
Reserved for the rare displaced calcaneal fracture — internal fixation by a foot and ankle surgeon is required.
What this guide is based on
The sources behind every claim on this page.
UK national guidance and specialist society standards, current at the time of last review.
Key references
Guidelines and standards we relied on.
A quiet reminder
This guide is for information, not medical advice.
Your GP, sports medicine clinician or foot and ankle team knows your history and can tell you which parts apply to you. If in doubt, get seen.
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British Orthopaedic Foot and Ankle Society (BOFAS). Clinical standards and patient information.
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NICE. Musculoskeletal guidance on stress fractures and return-to-activity planning.
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British Association of Sport and Exercise Medicine (BASEM). Guidance on bone stress injuries in athletes.
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International Olympic Committee (IOC). Consensus statement on Relative Energy Deficiency in Sport (RED-S).
Red flags
When heel pain needs urgent or specialist review.
Most stress fractures settle with offloading and a sensible return-to-run. These are the situations where more work-up or urgent review is needed.
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Displaced calcaneal fracture
A displaced fracture with heel deformity or inability to weight-bear needs urgent orthopaedic surgical review — this is not a rehab problem.
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Bilateral stress fractures
Stress fractures in both heels at once strongly suggests an underlying bone-health or energy-availability problem — needs a broader work-up.
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RED-S (Relative Energy Deficiency)
Under-fuelling in athletes — with menstrual dysfunction, fatigue and repeated bone injury — is a treatable driver that must not be missed.
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Osteoporotic insufficiency fracture
A calcaneal fracture with minimal trauma in an older adult can represent an insufficiency fracture — investigate for osteoporosis.
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Missed diagnosis on X-ray
Ongoing heel pain despite a normal X-ray in a runner or recruit needs MRI — X-rays are frequently negative for the first few weeks.
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Post-operative wound complication
New pain, swelling, warmth or wound problems after surgical fixation of a calcaneal fracture — contact your surgical team promptly.
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Chronic heel pain despite healing
Persistent pain long after imaging shows the fracture has healed — needs review for delayed union, non-union or a second pathology.
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Recurrent stress fracture
A second stress fracture in the same season points to unresolved training-load, biomechanical or bone-health issues — do not just re-rest.
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Return-to-run failure
Repeated flare-ups on attempting to resume running mean the return-to-run programme, or the underlying cause, has not been correctly addressed.
Living with it
A slow injury, but a very manageable one.
Four things that make the biggest difference — rest, fuel, a staged return-to-run and honest reassessment if pain returns.
A quiet reminder
Bone heals to a schedule, not a mood.
You can’t motivate a stress fracture to heal faster — offload properly, fuel well and let the bone do its work.
- 01 Rest
Offload properly, first
Four to six weeks in a walking boot or non-weight-bearing — the bone will not heal while it is still being loaded, no matter how motivated you are.
- 02 Fuel
Eat enough for the work
Under-fuelled athletes do not heal stress fractures on time — optimise energy intake, vitamin D and calcium during recovery.
- 03 Return
Return to run in stages
Walking, then jog-walk, then continuous easy running over several weeks — a structured plan beats a heroic first week that undoes healing.
- 04 Reviews
Reassess if pain returns
A flare on return-to-run is a signal, not a failure — reassess the plan, the load and the fuelling before pushing on.
Frequently asked
Everything we get asked about calcaneal stress fracture.
Quick answers on diagnosis, MRI, healing time, RED-S and when to seek help.
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What actually causes a calcaneal stress fracture?
Repetitive impact loading of the heel — a sudden increase in running mileage, marching, jumping or a change in training surface. Bone remodels to load, but if the load rises faster than the remodelling can keep up, microdamage accumulates into a stress fracture.
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Why did my X-ray look normal if it is a stress fracture?
Early X-rays are frequently normal — bony changes take two to three weeks to become visible. MRI shows bone marrow oedema and the fracture line long before X-ray changes appear, and is the investigation of choice.
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How long does a calcaneal stress fracture take to heal?
Typically four to six weeks of offloading in a walking boot, followed by a graded return-to-run programme over several more weeks. Total time from diagnosis to full running is usually two to three months, longer if bone-health or fuelling issues are present.
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What is RED-S and why does it matter?
Relative Energy Deficiency in Sport (RED-S) is a syndrome where an athlete does not eat enough to match training load. It impairs bone healing, disrupts menstrual function and drives recurrent stress fractures. It is common, treatable and easily missed.
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Do I need a bone density scan?
A DEXA scan is considered if stress fractures are recurrent, if the training load that caused it was modest, or if there are other risk factors for low bone mineral density. It is not routine for a first stress fracture in a young athlete with a clear training-load trigger.
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When should I worry that it is more than a stress fracture?
A displaced fracture with heel deformity or inability to weight-bear, bilateral stress fractures, minimal-trauma fractures in older adults, or heel pain that persists long after healing — these need urgent or specialist review rather than more rest.
Related content
Keep reading.
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Plantar fasciitis
The other common cause of heel pain.
Learn more -
Achilles tendinopathy
Load-related pain at the back of the heel.
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Foot MRI
The investigation of choice for stress fracture.
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All conditions
The full A–Z of our patient guides.
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Musculoskeletal MRI
Related diagnostic test.
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X Ray
Related diagnostic test.
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Cortisone Shots
Related treatment option.
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Chondroplasty
Related treatment option.
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