A foot drop brace must fit closely enough to control or assist the foot, so light temporary marks can sometimes appear where the device contacts the skin.
These marks should not become increasingly painful, develop into blisters or remain unchanged for a prolonged period after the brace is removed.
Many NHS orthotics services advise contacting the relevant service when redness lasts for approximately 20 to 30 minutes. Guidance differs slightly between services and devices, so follow the instructions supplied by your own orthotist or manufacturer.
Rubbing or persistent pressure can result from:
- The heel not being fully seated
- A sock wrinkle
- The wrong sock thickness
- Incorrect strap tension
- Unsuitable footwear
- The brace moving inside the shoe
- Swelling
- A change in body shape
- A worn strap or pad
- A damaged brace
- The wrong size or side
- Wearing a new brace for too long
- Moisture and sweating
- A change in walking pattern
Do not simply continue wearing the brace until the skin “toughens up”. Pressure damage can worsen when its cause is not corrected.
Are Red Marks From an AFO Normal?
Some mild temporary marking can be expected from a close-fitting orthosis.
A temporary mark is more likely to be acceptable when it:
- Is light rather than deeply discoloured
- Appears directly beneath a normal contact area
- Does not hurt
- Begins to fade after the AFO is removed
- Does not become a blister
- Does not break the skin
- Does not become warmer or more swollen
- Is not getting worse from day to day
A mark is more concerning when it:
- Remains for longer than the period advised by your orthotics service
- Becomes painful
- Develops into a blister
- Is associated with broken skin
- Appears increasingly dark
- Feels unusually hot or cold
- Is accompanied by swelling
- Returns more severely each time
- Occurs over a bony area
- Is accompanied by numbness or tingling
Guy’s and St Thomas’ NHS Foundation Trust advises that mild redness can occur, but redness lasting longer than 30 minutes, skin breaks, pain, irritation or increased rubbing should be reported to the orthotics service.
What Should You Do When You Notice a Red Mark?
Sit somewhere safe and remove the brace, footwear and sock.
Then:
- Inspect the entire foot and lower leg.
- Identify exactly where the mark has appeared.
- Check whether the skin is intact.
- Check for swelling, warmth or tenderness.
- Allow the pressure mark time to fade.
- Inspect the sock for folds or dampness.
- Check the inside of the brace for damage or debris.
- Check the footwear for tightness or foreign objects.
- Do not immediately refit the brace over a painful area.
- Seek advice if the mark does not resolve or repeatedly returns.
Use good lighting and a mirror if necessary.
If you cannot see the sole, heel or back of the leg clearly, ask another person to check where appropriate.
Why Does an AFO Rub the Ankle Bones?
The inside and outside ankle bones are common pressure areas because they sit close to the brace.
Rubbing may occur when:
- The heel is not fully down
- The foot is sitting too far forwards
- The AFO is rotating
- The brace is the wrong size
- The wrong left- or right-foot version is being used
- The shoe is squeezing the AFO sideways
- The foot is turning within the brace
- The original fit has changed
- Padding has worn away
- The device requires professional modification
A lifted heel changes the relationship between the ankle and the shaped sections of the AFO. This can place a hard edge against an ankle bone even when the brace itself is the correct model.
Before tightening the straps, first make sure the heel is fully back and down.
Do not attempt to solve ankle pressure by adding a thick pad inside the AFO. Unauthorised padding can move the foot and transfer pressure to another area. The Royal National Orthopaedic Hospital specifically advises against padding or altering an orthosis without professional guidance because this may increase pressure problems.
Why Does the Brace Rub the Heel?
Heel rubbing commonly occurs when the heel moves up and down or from side to side.
Possible causes include:
- The heel is not fully seated
- The shoe is too loose
- The shoe is too long
- The AFO is moving inside the footwear
- An ankle-retaining strap is loose
- The calf strap is not stabilising the brace
- The heel cup is the wrong shape
- A sock is folded beneath the heel
- The shoe’s internal lining is worn
- The AFO footplate is not lying flat
Check the fit while standing as well as sitting.
The heel should remain:
- Fully down
- Back against the intended rear section
- Centred
- Stable during walking
- Secure within the footwear
A larger shoe does not always solve an AFO fitting problem. Excess length may allow the foot to slide forwards and increase heel movement.
A wider or deeper shoe in the correct length is often more appropriate than simply buying a much longer size.
Why Does the Calf Strap Leave a Deep Mark?
A calf strap should stabilise the upper section of the AFO without acting like a tight band around the leg.
A deep mark may be caused by:
- Excessive strap tension
- A twisted strap
- Narrow or folded padding
- Swelling during the day
- A worn strap
- A cuff that is too small
- A trouser leg compressing the strap
- The brace pulling away from the calf
- The foot or heel being incorrectly positioned below
Check whether the strap:
- Lies completely flat
- Has its padding centred
- Is free from twists
- Remains at the intended height
- Feels secure without throbbing
- Does not create swelling below it
Do not overtighten the calf strap to compensate for a heel that is moving.
The entire fitting sequence should be checked instead.
Why Does a Textile Foot Drop Support Rub?
Soft textile braces can also cause rubbing.
Products such as Boxia® and StepUp® create contact at the:
- Ankle or calf cuff
- Achilles region
- Top of the foot
- Sides of the foot
- Lifting straps
- Silicone grip areas
- Footwear attachment
Rubbing may occur when:
- A strap is twisted
- The cuff is sliding
- Tension is excessive
- The lifting force is pulling sideways
- The support is fitted at the wrong height
- Moisture is trapped beneath the fabric
- A seam sits over a prominent area
- The product is worn against skin when a fabric interface has been advised
- The wrong size has been selected
- The elastic has stretched
The strap system should provide enough lift to improve toe clearance without cutting into the skin or pulling the foot into an uncomfortable position.
Increasing traction is not always the correct response when toe clearance remains poor. The brace may be unsuitable for the severity or type of foot drop.
Can a Wrinkled Sock Cause Rubbing?
Yes. A small fold in a sock can create a concentrated pressure area beneath a close-fitting AFO.
Before applying the brace, make sure the sock:
- Is long enough to extend above every brace edge
- Fits closely
- Has no folds
- Is not gathered behind the heel
- Has no bulky seams beneath the foot
- Is clean
- Is dry
- Has not twisted around the leg
A long, thin, smooth sock is commonly recommended with rigid AFOs to help protect the skin from friction.
Do not automatically use a very thick sock. Additional thickness may make the AFO or footwear too tight.
Follow the advice provided for the exact brace.
Can Wearing the AFO Without a Sock Cause Rubbing?
Rigid AFOs are commonly worn over a smooth fabric layer such as a suitable sock or Tubigrip when directed.
This helps:
- Reduce friction
- Manage moisture
- Protect the skin
- Prevent direct contact with rigid edges
- Make skin inspection easier
Do not assume that every textile support must be worn in the same way. Some products have different fitting instructions.
Follow the instructions supplied with your particular device.
NHS guidance advises wearing socks with an AFO and checking the skin after use.
Can Footwear Cause AFO Pressure Marks?
Yes. Footwear is part of the complete AFO fit.
A correctly sized brace can become uncomfortable when inserted into an unsuitable shoe.
The shoe may cause pressure when it is:
- Too narrow
- Too shallow
- Too short
- Too loose
- Backless
- Difficult to fasten
- Worn unevenly
- Made with rigid internal seams
- Compressing the sides of the AFO
- Allowing the foot to slide
- Pressing the toes into the front
A suitable AFO shoe normally needs:
- Adequate width
- Adequate depth
- A secure back
- Adjustable laces or touch-close fastening
- A stable sole
- Enough opening to insert the brace
- Room for the footplate
- Secure heel control
Some shoes have a removable insole that can be taken out to create additional depth where this is appropriate. NHS AFO guidance commonly recommends wide, deep, adjustable footwear and notes that a removable insole can help accommodate the brace.
Can a Shoe Be Too Loose?
Yes.
A loose shoe may allow:
- The AFO to move
- The heel to lift
- The foot to slide forwards
- The footplate to shift
- The ankle to rub
- The toes to grip
- Walking to become less stable
The shoe should secure the foot and AFO together as one unit.
Do not leave the laces loose simply because the brace occupies additional space.
The shoe should fasten comfortably without crushing the foot or allowing excessive movement.
Why Does the Top of the Foot Become Red?
Pressure across the top of the foot may result from:
- Footwear that is too shallow
- An instep strap that is too tight
- A sock seam
- Swelling
- The foot sliding forwards
- The heel not being fully seated
- A textile foot strap being overtightened
- A rigid shoe tongue
- The original shoe insole taking up too much depth
Check whether the pressure is coming from the AFO, the shoe or the combination of both.
Loosening one strap may not resolve the problem if the footwear is too shallow.
Seek fitting advice if the pressure returns repeatedly.
Why Do the Toes Rub?
Toe rubbing may occur when:
- The shoe is too short
- The foot slides forwards
- The footplate is too long
- The heel is lifted
- The shoe is too narrow
- The toes are curling
- The brace is altering foot position
- The footwear has a hard toe seam
- Swelling develops
- The wrong sock is being used
The toes should have enough room to lie naturally without being forced against the end or sides of the shoe.
Do not trim a rigid footplate unless the product is specifically designed for trimming and the alteration is carried out by an appropriately qualified person.
Can Sweating Cause Rubbing?
Yes.
Moisture can increase friction and soften the skin, making it more vulnerable to damage.
Heat may build up beneath:
- Plastic shells
- Calf straps
- Textile cuffs
- Silicone grips
- Socks
- Tight trousers
- Enclosed footwear
To help manage moisture:
- Use suitable breathable socks
- Change damp socks
- Allow the skin to dry
- Clean the brace as instructed
- Allow all components to dry naturally
- Avoid unnecessary compression layers
- Check the skin more frequently in hot weather
- Do not refit a wet brace
Do not dry a plastic or textile AFO on a radiator or with a hairdryer unless the manufacturer specifically permits it. Excessive heat can distort or damage orthotic materials.
Can a New AFO Cause More Marks Initially?
A new device can create unfamiliar pressure because the skin and walking pattern have not yet adapted.
This is one reason new AFOs are often introduced gradually.
A typical wearing-in process may involve:
- A short initial wearing period
- Removing the brace
- Inspecting the skin
- Allowing temporary marks to fade
- Increasing wear gradually
- Rechecking after longer activity
Your own orthotist’s schedule takes priority because different AFOs and medical presentations require different routines.
Oxford University Hospitals advises beginning with short periods, building up gradually and contacting the orthotics department if redness does not disappear within approximately 20 to 30 minutes.
A wearing-in period does not mean that blisters, broken skin or increasing pain should be accepted.
Can Wearing the Brace for Too Long Cause Rubbing?
Yes. A brace may be comfortable initially but become problematic later because of:
- Swelling
- Sweating
- Muscle fatigue
- Strap movement
- Footwear becoming tighter
- Long periods of sitting
- A change in walking pattern
- Increased activity
- Repeated stair use
- A damp sock
When introducing a new support, do not immediately wear it through a full working day unless this has been specifically advised.
Build up gradually and inspect the skin regularly.
Can Swelling Change the Fit?
Yes. Swelling can make a previously comfortable brace feel tighter.
Signs include:
- Straps leaving deeper marks
- Difficulty fastening the shoe
- Toe pressure
- Throbbing
- Numbness
- Tingling
- Indentations
- The brace becoming difficult to remove
Repeated swelling should be discussed with a healthcare professional rather than managed solely by loosening the straps.
Seek prompt medical advice if swelling is sudden, severe, painful or associated with a marked change in skin colour or temperature.
Can Weight or Muscle Changes Affect an AFO?
Yes.
The fit can change following:
- Weight gain
- Weight loss
- Muscle wasting
- Reduced swelling
- Increased swelling
- Surgery
- Rehabilitation
- Changes in muscle tone
- Growth in younger users
A brace that was fitted correctly several months ago may begin to move or press differently.
Arrange a review if a previously comfortable AFO begins to:
- Rub
- Rotate
- Feel loose
- Feel too tight
- Become difficult to fasten
- Provide less foot clearance
- Affect the knee differently
- Alter the position of the foot
Can a Damaged or Worn Brace Cause Rubbing?
Yes.
Inspect the brace regularly for:
- Cracked plastic
- White stress marks
- Sharp edges
- Loose rivets
- Worn padding
- Frayed straps
- Weak touch-close fastening
- Stretched elastic
- Damaged hooks
- Peeling silicone
- Debris inside the shoe or brace
Worn padding may expose a firmer surface, while loose straps may allow movement and friction.
Guy’s and St Thomas’ advises checking an AFO for loose rivets, worn fastening straps and cracked plastic and contacting the orthotics service for repairs rather than attempting changes yourself.
Can the Wrong Size Cause Red Marks?
Yes.
A brace that is too small may:
- Press against ankle bones
- Constrict the calf
- Crowd the toes
- Be difficult to fasten
- Cause deep marks
- Restrict circulation
A brace that is too large may:
- Slide
- Rotate
- Allow heel movement
- Rub repeatedly
- Fail to control the foot
- Move inside the shoe
Do not choose a larger size simply because the correct size feels firm, and do not choose a smaller size to make a brace feel more supportive.
Use the product-specific measurement guide and professional advice where appropriate.
Make Sure You Have the Correct Side
Many rigid AFOs have separate left- and right-foot versions.
Using the incorrect side can cause:
- Poor footplate alignment
- Ankle pressure
- Heel movement
- Rotation
- Sideways pressure
- Poor shoe fit
- Reduced walking control
Check the label, footplate shape and product instructions before wearing it.
Should You Loosen the Straps When the Brace Rubs?
Not automatically.
A strap may be too tight, but rubbing can also occur because the brace is too loose and moving against the skin.
Before changing the tension, check:
- Heel position
- Sock condition
- Foot placement
- Strap alignment
- Footwear
- Swelling
- The brace size
- Device wear
Change only one factor at a time and retest for a short period where it is safe to do so.
If the pressure persists, obtain professional fitting advice.
Should You Add Padding?
Do not add permanent or thick improvised padding to a rigid AFO without advice.
Extra foam, folded socks, tissues or dressings can:
- Increase pressure
- Move the foot
- Reduce internal space
- Transfer force elsewhere
- Make footwear tighter
- Conceal worsening skin damage
A clinician or orthotist may add or alter specialist padding when appropriate, but this should be based on the exact pressure location and the function of the brace.
Can You Put a Plaster Over a Blister and Keep Wearing the AFO?
Do not continue wearing the brace over a blister or broken area without professional advice.
A dressing may protect the surface but does not remove the pressure that caused the injury.
Continuing to load the same point can:
- Enlarge the blister
- Delay healing
- Cause infection
- Damage deeper tissue
- Make the brace harder to refit later
Stop using the brace and contact the relevant healthcare professional.
Seek prompt medical advice if the area becomes increasingly red, hot, swollen, painful or produces discharge.
What if the Skin Is Darker and Redness Is Difficult To See?
Pressure damage can be less obvious on brown or black skin.
Do not rely only on visible redness.
Also check for:
- Darker or lighter discolouration
- Warmth
- Coolness
- Swelling
- Tenderness
- Skin becoming shiny
- A change in texture
- Firmness
- Blistering
- Broken skin
NHS guidance notes that persistent redness may be harder to identify on brown or black skin, making touch and comparison with surrounding areas important.
Take Extra Care With Diabetes or Reduced Sensation
Reduced sensation can prevent the wearer from feeling pressure or rubbing.
Extra care is important for people with:
- Diabetes
- Peripheral neuropathy
- Previous stroke
- Spinal conditions
- Multiple sclerosis
- Nerve injuries
- Poor circulation
- Previous ulcers
- Fragile skin
Precautions may include:
- More frequent inspections
- Shorter initial wear periods
- Using a mirror
- Asking another person to check
- Inspecting inside the shoe
- Regular professional review
- Avoiding use over broken skin
Do not rely on discomfort as the only warning sign.
When Should You Stop Wearing the Brace?
Remove the support and seek advice if you notice:
- Redness that does not fade
- Increasing pain
- Blistering
- Broken skin
- Bleeding
- Significant swelling
- Numbness
- Tingling
- Skin discolouration
- A cold foot
- An unusually hot area
- Increasing rubbing
- New instability
- Worsening toe clearance
Do not continue using a painful support because you are worried about walking without it.
Use your prescribed walking aid and follow the advice given by your healthcare team while the brace is being reviewed.
When Is Mild Muscle Aching Different From Skin Pressure?
A new AFO may change how the muscles and joints work during walking.
Some people experience temporary muscle aching as the body adapts. This feels different from a sharp pressure point on the skin.
Muscle adaptation may feel like:
- Generalised tiredness
- Mild aching after walking
- A feeling that different muscles have been used
A pressure problem is more likely to feel like:
- Burning
- Pinching
- Sharp local pain
- Rubbing
- A sore spot beneath an edge
- Tingling
- Numbness
Persistent or increasing pain of either type should be assessed.
Can the AFO Affect the Knee?
Yes. Some AFOs influence the ankle and knee together.
An unsuitable stiffness, angle or shoe combination may contribute to:
- Knee hyperextension
- Knee bending unexpectedly
- New knee pain
- Changes in stride
- Hip hiking
- Increased fatigue
A skin problem may therefore occur alongside a wider walking issue.
Do not focus only on the red mark if the brace is also making your knee or balance feel different.
How To Prevent Rubbing Before It Starts
Before every use:
- Inspect the brace
- Check the correct side
- Use the recommended sock
- Smooth every wrinkle
- Seat the heel fully
- Centre the foot
- Keep straps flat
- Fasten the shoe securely
- Check for debris
- Make sure the footwear is not too tight
- Confirm that textile straps are not twisted
- Test the brace over a short distance
- Inspect the skin after removal
During the day:
- Recheck after prolonged sitting
- Change damp socks
- Watch for swelling
- Check the brace after using the toilet or changing clothes
- Stop when discomfort begins rather than waiting for it to worsen
Simple Pressure-Point Checklist
When a mark develops, ask:
- Is the heel fully seated?
- Is the sock smooth?
- Is the sock damp?
- Is the strap twisted?
- Is the strap too tight?
- Is the brace moving?
- Is the shoe too narrow or shallow?
- Is the shoe too loose?
- Has the leg swollen?
- Is the brace damaged?
- Has padding worn away?
- Is this the correct side and size?
- Have I increased wearing time too quickly?
- Has my walking changed?
- Does the mark fade after removal?
If the cause is not obvious or the problem returns, arrange a fitting review.
Recommended Reinforced Leaf-Spring AFO
The Ankle Foot Orthosis Extra, SKU AFX, is a low-profile prefabricated AFO designed to assist dorsiflexion in people with flaccid foot drop.
Its features include:
- Injection-moulded polypropylene construction
- Carbon-fibre composite reinforcement
- A trimmable footplate
- An open heel
- A detachable, washable padded calf band
- An optional heel-retaining strap
- Separate left- and right-foot versions
- Small through X Large sizing
- Compatibility with suitable fastening footwear
The optional heel-retaining strap may provide additional stability for an appropriate wearer, while the padded calf band helps improve comfort at the upper contact area.
The brace contains latex. It should not be used where latex must be avoided without appropriate professional advice.
It is intended for suitable flaccid-foot-drop presentations and is not automatically appropriate for significant spasticity, a fixed ankle position or severe instability.
Will Changing to a Padded AFO Solve Rubbing?
Not necessarily.
Padding may improve comfort at a particular contact area, but rubbing can still occur when:
- The size is wrong
- The heel moves
- The footwear is unsuitable
- The foot is not centred
- The brace is too loose
- Swelling develops
- The walking pattern requires more control
- The skin is already damaged
The purpose, alignment and support level of an AFO matter as much as softness.
A heavily padded but unsuitable brace can still cause pressure.
Can a Foot Drop Brace Cure the Underlying Problem?
No.
A foot drop brace assists or controls the foot while it is being worn. It does not repair the nerve, muscle, brain or spinal condition causing the weakness.
Foot drop treatment may also include:
- Physiotherapy
- Treatment of nerve compression
- Functional electrical stimulation
- Management of an underlying condition
- Falls prevention
- Walking aids
- Surgery in selected cases
When Should Foot Drop Be Medically Assessed?
Arrange a GP appointment if you have difficulty lifting the front of your foot or toes, particularly if the weakness is new, unexplained or worsening.
Seek further assessment if:
- Both feet are affected
- You are falling more frequently
- Numbness is increasing
- Other parts of the leg are becoming weak
- The brace no longer controls the foot
- Symptoms followed surgery or injury
Call 999 if sudden weakness occurs with:
- Facial drooping
- Arm weakness
- Slurred or confused speech
Seek urgent assessment if new weakness occurs with:
- Severe or worsening back pain
- Numbness around the genitals or buttocks
- Difficulty controlling urination
- Loss of bladder or bowel control
- Rapidly worsening weakness
Do not rely on an AFO to conceal new neurological symptoms without identifying their cause.
