Protective helmets after craniectomy

Why a helmet

A decompressive craniectomy removes part of the skull so a swollen brain has room to expand. The bone usually stays out until a later operation, cranioplasty, repairs the opening. Until then, only the scalp covers that part of the brain, so a fall or knock against a hard surface can injure it directly.¹

The risk of falling is also higher than usual. Balance and coordination are often affected after brain surgery.¹ Patients interviewed about life after craniectomy describe this feeling directly. One said, "my brain is not protected," and several expected to change their activities because they were afraid of falling.⁵

When to wear it

There is no single rule. Your team will look at your risk of falling, how alert and settled you are, and how much you are moving around, then set a wearing plan for you.²

As an example, one hospital's clinical guideline describes a stepped approach:²

• During transfers, such as moving from bed to chair, for most patients.
• When sitting out of bed, if there is a risk of falling or injury while seated.
• In bed in some cases, alongside measures like a low bed or a bed alarm.

At home, the same idea usually applies: wear it whenever you are up and moving, and follow the written plan your team gives you. The same guideline says the helmet plan should be reviewed before you leave the hospital and handed over to whoever is caring for you next.²

Getting the fit right

• Measured and fitted by trained staff. Hospitals typically measure your head and supply a helmet in the right size.²
• Room for swelling. Head swelling changes over the first weeks, so many helmets have adjustable sides.³
• Regular checks. Caregivers should look for red marks, swelling and signs of discomfort, especially early on.²
• Report problems right away. If the helmet rubs, leaves marks or hurts, tell the nurse or therapist who fitted it instead of loosening or padding it yourself.³

Not all helmets protect the same

A 2025 laboratory study dropped a test head wearing six different medical helmets and two sports helmets, and measured the forces that reached it. The results varied widely:⁴

• The gap between the best and worst performers was large on every measure.
• Two of the six medical helmets went past an injury threshold in most of the tests.
• Only two medical helmets matched the sports helmets for both protection and comfort.

The researchers noted that medical helmets in the UK are essentially unregulated and called for performance standards.⁴ The study did not name the brands it tested, so it can't tell you which helmet to buy. It does make a good case for asking your team which helmet they use and why, rather than choosing on looks or price alone.

Don't swap in a bike, sports or novelty helmet unless your team says it is suitable. Medical helmets are designed for different falls and to be worn for hours at a time.

Living with a helmet

• Keep it clean. Follow the cleaning instructions that come with it. A washable liner helps.³
• Keep it where you get up. Leave it by the bed and the favorite chair, so it's on before the first step.
• Brief everyone who helps. Family members and home care staff should know the wearing plan and what problems to watch for.²
• Make the home safer too. Night lights, a shower chair and non-slip mats cut down the falls a helmet is there for. See the fall prevention checklist.
• It's okay to find it hard. Changes in appearance after craniectomy can be upsetting.⁵ A soft cap over or under the helmet, if your team allows it, can help some people feel more comfortable going out.

Only your surgeon can tell you when it's safe to stop wearing the helmet. Don't stop on your own, even after cranioplasty, until you have that go-ahead.

Questions to ask your care team

1. Do I need a helmet, and will the hospital provide and fit one?
2. When exactly should I wear it: walking, sitting, in bed, outside?
3. Which helmet do you recommend, and why that one?
4. Who do I call if it stops fitting or causes marks?
5. How do I clean it, and how often should it be checked?
6. When can I stop wearing it?

If you need to buy one

Many hospitals supply and fit a helmet. If your team asks you to buy your own, look for:

• A soft, padded shell that fully covers the side of the head without bone
• Adjustable sizing for swelling
• A breathable, washable liner
• A chin strap that you or a caregiver can fasten easily

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Sources

1. Cleveland Clinic. Craniectomy: what it is, procedure, recovery and risks. my.clevelandclinic.org/health/treatments/24901-craniectomy
2. Royal Cornwall Hospitals NHS Trust. Protective helmets in adult craniectomy patients: clinical guideline, version 3.0. 2025. doclibrary-rcht.cornwall.nhs.uk (PDF)
3. Royal Cornwall Hospitals NHS Trust. Following your craniectomy: wearing a protective helmet (patient leaflet). doclibrary-rcht.cornwall.nhs.uk/GET/d10338475
4. England R, Haynes M, Mee H, Farmer J. An evaluation of the performance of medical helmets used in healthcare for the protection of vulnerable patients. Front Bioeng Biotechnol. 2025;13:1575075. doi:10.3389/fbioe.2025.1575075
5. Carroll P, Whyte A, Malone A. A qualitative exploration of the lived experience of decompressive craniectomy among acquired brain injury survivors. Disabil Rehabil. 2026. doi:10.1080/09638288.2026.2731080