AFO Types: Solid, Hinged, Carbon Fibre and Plastic Braces
By Maegan Morrison, AOPA Certified prosthetist and orthotistUpdated
An ankle-foot orthosis (AFO) supports the foot and ankle. Different designs control movement in different ways: some hold the ankle still, while others allow selected movement or provide a flexible spring action.
The right design depends on your strength, joint movement, walking pattern, skin and daily tasks. A diagnosis such as stroke or cerebral palsy does not, on its own, tell you which brace to choose.
This guide compares the main AFO types, carbon fibre and plastic materials, and custom and ready-made options. Use it to prepare questions for an AFO assessment.
What an AFO Actually Does (Beyond 'Supporting Your Ankle')
An ankle-foot orthosis does more than prop up a weak ankle. These devices control movement across multiple planes, influence how your knee functions during walking, and can dramatically reduce the energy you burn just getting around.
For stroke survivors, AFOs improve walking speed by an average of 0.14 metres per second and increase stride length significantly². That might not sound like much until you realise it's the difference between safely crossing a Brisbane intersection before the light changes or not.
Children with cerebral palsy wearing AFOs show improved balance, functional mobility, and reduced energy expenditure³. Parents report their kids can participate in activities they previously avoided — school sports days, playground equipment, walking to a mate's house.
The Main AFO Types You'll Encounter
Solid Ankle AFO (AFO)
This is the workhorse. A solid ankle AFO prevents both plantarflexion (foot dropping down) and dorsiflexion (foot lifting up). The ankle stays locked at a set angle — usually neutral, or the closest/best position we can get the ankle to.
Best for:
- •Severe foot drop where the ankle muscles can't generate any useful movement
- •Significant ankle instability (rolling inward or outward)
- •High muscle tone that needs firm control
Trade-off:
- •Stairs and slopes feel unnatural (you can't adjust your ankle angle)
- •Reduced proprioception — you lose some feel for the ground
- •Can be a bit too restrictive for sports or high activity levels
Hinged (Articulated) AFO (AAFO)
These incorporate ankle joints — usually metal or carbon fibre hinges that allow controlled movement. Some ankle joints allow you to adjust stiffness, set dorsiflexion assists, or add plantarflexion stops.
Hinged AFOs offer adjustability to address specific foot and ankle issues whilst improving balance and facilitating more functional gait patterns⁴. They let your ankle move through a set range whilst preventing problematic positions.
Best for:
- •People who have some flexibility in their ankle joint, but can't control the movement due to weakness or increased muscle tone
- •People who need to navigate varied terrain (Queensland's hilly suburbs aren't flat)
- •Active individuals who want more natural movement
Trade-off:
More complex, requiring periodic adjustments and maintenance. Not suitable if you have limited flexibility in your ankle.
Posterior Leaf Spring (PLS)
The minimalist option. A thin, flexible piece of plastic runs up the back of your leg, providing just enough spring to lift your foot during swing phase. It doesn't restrict plantarflexion, so your ankle can still move downward.
Best for:
- •Mild foot drop without high muscle tone
- •People who want a low-profile design to fit a large range of shoes
- •Conditions like localised nerve injury, or early MS
Trade-off:
A flexible AFO can wear or change shape with use. Its useful life depends on the design, loading and care. Ask your orthotist to check cracks, changes in stiffness or a change in fit; a material name alone does not predict when it needs replacing.
Ground Reaction AFO (GRAFO)
This design wraps onto the front of your shin, with a broad, rigid anterior (front) shell. It applies a knee extension moment during stance phase — basically, it helps keep your knee from buckling by controlling how forces transfer through your ankle.
Best for:
- •Calf weakness such as in conditions like Charcot Marie Tooth (CMT)
- •Mild knee instability combined with ankle weakness
- •Balance issues in quiet standing that is caused by calf weakness
Trade-off:
Can be difficult to put on or fit into shoes. Not for everyone, but life-changing for those who need it.
Supramalleolar Orthosis (SMO) and UCBL
These shorter devices stop just above the ankle bones. They control foot position and support the arches but allow ankle movement. The UCBL (University of California Biomechanics Laboratory) variant is even shorter, and targeted mostly at correcting heel and arch positioning.
Best for:
- •Mild idiopathic toe-walking
- •Mild hindfoot and midfoot instability or weakness
- •Young children with mild weakness but not yet requiring AFOs, such as Ehlers Danlos syndrome (EDS)
Note:
SMOs enhance foot stability while allowing freedom of movement during sit-to-stand transitions⁴. They're less effective for managing significant equinus but can work brilliantly for positioning issues.
Carbon Fibre vs Plastic AFOs: What Matters?
Material matters, but so do the brace's shape, stiffness, fit and alignment in your shoe. Carbon fibre is not automatically the better option. A plastic AFO may provide the control or adjustment options you need.¹
| Consideration | Polypropylene (plastic) | Carbon fibre composite |
|---|---|---|
| Design | Can be made as a solid, hinged or flexible brace. Shape and thickness affect control. | May be a flexible spring design or a more rigid structure. Carbon fibre does not describe one single AFO type. |
| Adjustments | An orthotist can heat-adjust suitable areas. Do not heat or reshape it yourself. | Adjustment options depend on the device. Do not heat, cut or reshape it yourself. |
| Walking | The prescribed shape and stiffness must match your walking needs. | Some designs store and release energy during a step. That does not make them better for every person. |
| Footwear and cost | Trial it in suitable shoes and request an itemised quote. | Trial it in suitable shoes and compare the complete quote, including fitting and follow-up. |
What does the research show?
A 2024 crossover study of 15 people with chronic stroke compared a ready-made carbon AFO, each person's usual custom plastic AFO, and walking without an AFO. Both braces improved the measured walking outcomes compared with no brace; the study found no significant difference between the two braces.⁶ This small study does not establish that every carbon and plastic design performs equally, or that its findings apply to every condition.
Custom vs Prefabricated: When It Actually Matters
Prefabricated (off-the-shelf) AFOs have improved dramatically. Many stock designs now work brilliantly for straightforward cases, cost less, and get you walking sooner — sometimes within a week rather than the 3-4 weeks custom fabrication requires.
Go custom if you have:
- Significant deformities or asymmetries
- Complex needs requiring precise control
- Pressure-sensitive skin or previous breakdown
- Unusual limb dimensions
Our Sunshine Coast-based orthotist can assess whether a prefab device will work or if custom fabrication is worth the additional investment and wait time.
Paediatric AFOs: What Parents Need to Know
Children with cerebral palsy represent the largest group of paediatric AFO users in Australia. Up to 70% of kids at GMFCS levels IV and V use AFOs⁷. The prescriptions differ from adult devices because children are still growing and developing motor patterns.
About 73% of children using AFOs to improve function achieve their prescribed goals⁷ — that's walking more independently, better balance, or easier participation in activities.
Key considerations:
- Regular reviews every 6-12 months to accommodate growth
- Balancing support with motor learning opportunities
- Ensuring devices work with school shoes and activities
- Managing emotional acceptance (kids notice differences)
It's important to ensure time and consideration is given to aesthetics and customisation options that help with compliance. Kids can choose colours and designs, making the device feel less medical and more personal.
NDIS Funding for AFOs in Queensland
AFOs typically fall under Assistive Technology in your NDIS plan. Funding can cover custom fabrication, adjustments, replacements due to wear or growth, and related orthotist consultations.
What NDIS will fund:
- Prefabricated or Custom AFOs prescribed by specialists
- Materials justified by activity needs (carbon fibre for active users)
- Regular adjustments and maintenance
- Replacement due to wear, growth, or condition changes
- Specialist footwear if it is required to fit your AFO, or complement the prescription
A comprehensive report from your orthotist detailing functional needs, material requirements, and expected outcomes strengthens your NDIS application. Most NDIS providers in Brisbane and the Sunshine Coast understand this process and can assist with documentation.
Making the Right Choice for Your Situation
Here's what actually matters when selecting an AFO type:
Your condition's stability.
Early stroke recovery (first 6-12 months) may need different designs than chronic, stable weakness. Cerebral palsy requires consideration of growth and motor development. Progressive conditions like MS might benefit from easily adjustable options.
Your actual lifestyle.
Be honest. If you're mostly home with occasional outings, a plastic AFO may work fine. If you're hiking Sunshine Coast trails or playing at the park with grandkids, carbon fibre can be worth the investment.
Available muscle function.
This determines whether you need complete restriction (solid ankle) or can benefit from dynamic assistance (hinged). Your orthotist will assess strength using standardised scales and advise you of the best options for your condition.
Tolerance and compliance.
The best AFO in the world doesn't help if you can't tolerate wearing it. Sometimes starting with something simpler and building up works better than jumping to the 'optimal' solution immediately.
Don't expect one device to solve everything forever.
Your needs will likely change. Many successful AFO users have different devices for different purposes or upgrade as their condition changes.
Understanding the main AFO types helps you ask about the support, movement and fit you need. Discuss daily tasks and walking goals with your orthotist, and ask how the proposed brace will be checked at fitting and follow-up.
Start with a thorough assessment from a qualified orthotist. Discuss your goals honestly — what you want to be able to do, not just what's 'wrong'. Try demonstration devices if available. And remember: the best AFO is the one you'll actually wear.
About the author
Maegan Morrison
Maegan is an AOPA Certified prosthetist and orthotist on the Sunshine Coast. She runs Align Prosthetics and sees every client herself, at home or at the Birtinya clinic.
About MaeganTalk to Maegan about an AFO
Tell Maegan what you want to be able to do. She will explain which AFO designs make sense for you and what happens next.
Open 7 days, 9am to 7pm. Home visits across the Sunshine Coast or our Birtinya clinic.
Medical Disclaimer: This article provides general information about ankle-foot orthoses and should not replace professional medical advice. AFO prescription requires assessment by a qualified orthotist. Individual needs vary significantly based on medical condition, functional status, and treatment goals.
Frequently Asked Questions
How long does a custom AFO take to make in Australia?▼
Custom AFOs typically require 3-4 weeks from casting to delivery. This includes mould creation, fabrication, and initial fitting appointments. Prefabricated AFOs can often be fitted within 1-2 weeks. NDIS or other funding approval processes may add additional time between your assessment and casting appointments.
Can I wear an AFO without shoes?▼
No (unless the AFO is specifically made with a shoe-like sole). AFOs are designed to function with appropriate footwear and become slippery and unstable without shoes. The footplate requires shoe support for proper alignment and weight distribution. You'll need shoes with adequate depth, preferably with laces or Velcro for secure fastening. If specialist footwear is required, this can be included in prescription and funding applications.
How much do AFOs cost in Queensland?▼
Plastic AFOs typically range from $800-$2,500 depending on complexity. Carbon fibre versions run $2,000-$4,500. Custom fabrication costs more than prefabricated options, and various ankle joints add additional costs. NDIS funding can cover most or all costs with appropriate justification. Private health insurance coverage varies by policy. Medicare doesn't typically cover AFOs, but DVA coverage is available for eligible veterans, and MASS funding may be available for those not eligible for NDIS.
Will an AFO help my foot drop from stroke?▼
An AFO may help with foot clearance and walking after stroke. Research reports improvements in some walking measures, but the benefit varies between people and designs. Your orthotist assesses strength, joint movement, muscle tightness and walking goals, then checks how you walk in the proposed brace. It does not remove every risk of a fall.
How often do AFOs need replacing?▼
There is no single replacement interval for all AFOs. Growth, wear, cracks, changes in fit or a change in your walking needs may prompt a review. Your orthotist can assess whether adjustment, repair or replacement is appropriate. Funding for a replacement depends on the relevant scheme and your assessed needs; it is not automatic after a set number of years.
References
1. Choo YJ, Chang MC. Commonly Used Types and Recent Development of Ankle-Foot Orthosis: A Narrative Review. Healthcare (Basel). 2021;9(8):1046. doi:10.3390/healthcare9081046
2. Choo YJ, Chang MC. Effectiveness of an ankle-foot orthosis on walking in patients with stroke: A systematic review and meta-analysis. Sci Rep. 2021;11:15879. doi:10.1038/s41598-021-95449-x
3. Aboutorabi A, Arazpour M, Bani MA, Saeedi H, Head JS. Efficacy of ankle foot orthoses types on walking in children with cerebral palsy: A systematic review. Ann Phys Rehabil Med. 2017;60(6):393-402. doi:10.1016/j.rehab.2017.05.004
4. Physiopedia. Orthotics in Cerebral Palsy. Available at: https://www.physio-pedia.com/Orthotics_in_Cerebral_Palsy. Accessed October 2025.
5. Giacomozzi C, Stebbins J. Trends and techniques in materials, Part I: O&P. Lower Extremity Review Magazine. January 2013.
6. Rimaud D, Testa R, Millet GY, Calmels P. Effects of carbon versus plastic ankle foot orthoses on gait outcomes and energy cost in patients with chronic stroke. J Rehabil Med. 2024;56:35213. doi:10.2340/jrm.v56.35213
7. Hägglund G, Alriksson-Schmidt A, Lauge-Pedersen H, Rodby-Bousquet E, Wagner P, Westbom L. Ankle-foot orthoses in children with cerebral palsy: a cross sectional population based study of 2200 children. BMC Musculoskelet Disord. 2014;15:327. doi:10.1186/1471-2474-15-327