Reviewed by Dr Sayed Ahmed, Certified Pedorthist | Last reviewed October 6 2026
Custom orthotics are designed to support, redistribute pressure and improve alignment for a wide range of foot conditions. For complex or structural deformities, how much they can achieve depends on one key factor: whether the deformity is flexible or rigid. This page explains what custom orthoticscan realistically do for severe and progressive foot conditions, condition by condition, and when orthotics alone may not be enough.
These are not edge cases. Severe flat feet, high arches, bunions, Charcot foot, arthritic joint changes and leg length differences all place demands on the foot that a standard shoe insert simply was not built to meet. Custom orthotics start from a clinical assessment and a precise 3D scan of your individual foot. That is what makes them different from anything you can buy off the shelf.
Reviewed by Dr Sayed Ahmed, Certified Pedorthist | Last reviewed October 6 2026
Custom orthotics are designed to support, redistribute pressure and improve alignment for a wide range of foot conditions. For complex or structural deformities, how much they can achieve depends on one key factor: whether the deformity is flexible or rigid. This page explains what custom orthoticscan realistically do for severe and progressive foot conditions, condition by condition, and when orthotics alone may not be enough.
These are not edge cases. Severe flat feet, high arches, bunions, Charcot foot, arthritic joint changes and leg length differences all place demands on the foot that a standard shoe insert simply was not built to meet. Custom orthotics start from a clinical assessment and a precise 3D scan of your individual foot. That is what makes them different from anything you can buy off the shelf.
What Counts as a Complex Foot Deformity?
Not every foot condition requires custom orthotics. A complex deformity is one where structural changes in the foot are causing pain, abnormal pressure, difficulty finding footwear or progressive functional decline.
Conditions that fall into this category include severe flat feet, high arches, bunions, hammer or claw toes, Charcot foot, arthritic joint changes, neurological conditions affecting foot alignment and leg length differences. Some of these are present from birth or early childhood. Others develop gradually with age, injury or systemic illness.
A standard shoe insert is made for an average foot. If your foot has a structural problem, average is not good enough.
What Counts as a Complex Foot Deformity?
Not every foot condition requires custom orthotics. A complex deformity is one where structural changes in the foot are causing pain, abnormal pressure, difficulty finding footwear or progressive functional decline.
Conditions that fall into this category include severe flat feet, high arches, bunions, hammer or claw toes, Charcot foot, arthritic joint changes, neurological conditions affecting foot alignment and leg length differences. Some of these are present from birth or early childhood. Others develop gradually with age, injury or systemic illness.
A standard shoe insert is made for an average foot. If your foot has a structural problem, average is not good enough.
Flexible vs Rigid Deformities: Why the Distinction Matters
Before any orthotic is designed, one of the most important questions is whether the deformity is flexible or rigid.
A flexible deformity corrects, fully or partially, when weight is taken off the foot or gentle pressure is applied in the right direction. Flat feet that appear severe when standing but look more normal when sitting are a familiar example. A flexible deformity gives an orthotic something to work with. By providing the right support at the right point, a custom device can guide the foot toward better alignment during walking and reduce the load on structures that are being overworked.
A rigid deformity does not correct with pressure or position change. The structural change is fixed. In this case, the orthotic's role shifts from correction toward accommodation, reducing pain and pressure, protecting vulnerable areas and slowing further deterioration rather than changing the underlying shape of the foot. It is worth being direct about this: custom orthotics do not reverse a rigid structural deformity in adults. What they can do is make daily life significantly more comfortable and reduce the risk of secondary complications.
Understanding which category applies to your condition is part of what the foot assessment determines.
Flexible vs Rigid Deformities: Why the Distinction Matters
Before any orthotic is designed, one of the most important questions is whether the deformity is flexible or rigid.
A flexible deformity corrects, fully or partially, when weight is taken off the foot or gentle pressure is applied in the right direction. Flat feet that appear severe when standing but look more normal when sitting are a familiar example. A flexible deformity gives an orthotic something to work with. By providing the right support at the right point, a custom device can guide the foot toward better alignment during walking and reduce the load on structures that are being overworked.
A rigid deformity does not correct with pressure or position change. The structural change is fixed. In this case, the orthotic's role shifts from correction toward accommodation, reducing pain and pressure, protecting vulnerable areas and slowing further deterioration rather than changing the underlying shape of the foot. It is worth being direct about this: custom orthotics do not reverse a rigid structural deformity in adults. What they can do is make daily life significantly more comfortable and reduce the risk of secondary complications.
Understanding which category applies to your condition is part of what the foot assessment determines.
How Orthotics Help, Condition by Condition
Severe flat feet and adult acquired flatfoot
Flat feet exist on a spectrum. Many people with low arches function well and never need intervention. The presentations that benefit most from custom orthotics are those where the arch collapses significantly under load, the heel tilts inward and the tibialis posterior tendon is being placed under progressive strain.
Orthotics for overpronation in this context aim to support the arch, control heel position and reduce the load on the tibialis posterior tendon. For adult acquired flatfoot, where the tendon has already been weakened or damaged, the orthotic works alongside medical management rather than as a standalone solution. Supportive footwear or medical-grade footwear is usually an important part of the prescription as well.
If the flatfoot is worsening rapidly, or there is significant pain and swelling, medical review should happen before or alongside any orthotic intervention.
High arches (pes cavus)
A high-arched foot distributes load differently from a neutral or flat foot. Instead of spreading force across the arch, a rigid high arch concentrates it under the heel and the ball of the foot. Over time this can cause metatarsalgia, heel pain and stress-related injuries in the foot and ankle.
Orthotics for high arches aim to increase the contact area between the foot and the insole, cushion the pressure points and improve overall stability. Because a rigid high arch cannot be flattened by an orthotic, the device is designed to meet the foot where it is rather than push it toward a different shape. Extra-depth shoes are often needed alongside the orthotic to accommodate both the arch height and the device itself.
Bunions (hallux valgus)
A bunion develops when the big toe angles toward the other toes and the joint at the base of the toe becomes prominent. Custom orthotics for bunions aim to support overall foot posture and reduce the load passing through the first metatarsophalangeal joint with each step. What they do not do is straighten the toe or reverse the structural change at the joint.
For mild to moderate bunions, the right combination of orthotic support and appropriate footwear, wide enough in the toe box with no pressure on the joint, can significantly reduce day-to-day discomfort. For severe cases, particularly where the deformity is rigid and the joint is painful under any load, a surgical opinion may be warranted alongside conservative management.
Custom or wide, deep-toe-box shoes are often part of the prescription where bunions are involved, because standard footwear frequently creates direct pressure on the joint.
Hammer toes and claw toes
When toe joints bend and become stiff, they create pressure points on the top of the toe from the shoe and under the ball of the foot from the altered load distribution. Custom orthotics aim to offload the toes and reduce the pressure under the forefoot. Extra-depth or custom shoes that provide enough room for the toe deformity are usually needed alongside the orthotic to make a meaningful difference.
Charcot foot
Charcot foot is a serious condition in which the bones and joints of the foot weaken and change shape in a person with peripheral neuropathy, most commonly related to diabetes. Because sensation is reduced, the damage can progress significantly before pain prompts medical attention.
Custom orthotics in this context are focused on total-contact support and careful pressure redistribution, and they are managed as part of a broader medical team approach. A foot that is red, hot and swollen, particularly in someone with diabetes or neuropathy, requires urgent medical review, not an orthotic appointment.
Rheumatoid arthritis and other arthritic deformities
Joint changes from rheumatoid arthritis can cause significant pain and pressure in the foot, particularly in the forefoot and around the toes. Custom orthotics aim to cushion and redistribute pressure, accommodate the deformity and reduce the load on the most affected joints. As the condition changes over time, the orthotic prescription may need to be reviewed and updated.
Extra-depth or custom footwear is often an important part of managing arthritic foot deformity, because standard shoes tend to create pressure over joints that are already inflamed or misaligned.
Neurological changes
Conditions such as cerebral palsy, stroke and foot drop alter muscle control and foot alignment in ways that standard orthotics cannot always address. An ankle-foot orthosis (AFO) is often the primary device in these situations, working to support alignment and stability across the ankle joint rather than just the foot. Custom orthotics may be used alongside an AFO or in milder presentations where foot alignment is the primary concern.
Leg length difference
Even a small difference in leg length can alter gait mechanics enough to cause pain at the hip, knee, ankle or foot. A heel lift or built-up sole on the shorter side is one of the more straightforward orthotic interventions available. Larger differences usually require a shoe modification rather than an orthotic alone, and the two approaches are often combined.
How Orthotics Help, Condition by Condition
Severe flat feet and adult acquired flatfoot
Flat feet exist on a spectrum. Many people with low arches function well and never need intervention. The presentations that benefit most from custom orthotics are those where the arch collapses significantly under load, the heel tilts inward and the tibialis posterior tendon is being placed under progressive strain.
Orthotics for overpronation in this context aim to support the arch, control heel position and reduce the load on the tibialis posterior tendon. For adult acquired flatfoot, where the tendon has already been weakened or damaged, the orthotic works alongside medical management rather than as a standalone solution. Supportive footwear or medical-grade footwear is usually an important part of the prescription as well.
If the flatfoot is worsening rapidly, or there is significant pain and swelling, medical review should happen before or alongside any orthotic intervention.
High arches (pes cavus)
A high-arched foot distributes load differently from a neutral or flat foot. Instead of spreading force across the arch, a rigid high arch concentrates it under the heel and the ball of the foot. Over time this can cause metatarsalgia, heel pain and stress-related injuries in the foot and ankle.
Orthotics for high arches aim to increase the contact area between the foot and the insole, cushion the pressure points and improve overall stability. Because a rigid high arch cannot be flattened by an orthotic, the device is designed to meet the foot where it is rather than push it toward a different shape. Extra-depth shoes are often needed alongside the orthotic to accommodate both the arch height and the device itself.
Bunions (hallux valgus)
A bunion develops when the big toe angles toward the other toes and the joint at the base of the toe becomes prominent. Custom orthotics for bunions aim to support overall foot posture and reduce the load passing through the first metatarsophalangeal joint with each step. What they do not do is straighten the toe or reverse the structural change at the joint.
For mild to moderate bunions, the right combination of orthotic support and appropriate footwear, wide enough in the toe box with no pressure on the joint, can significantly reduce day-to-day discomfort. For severe cases, particularly where the deformity is rigid and the joint is painful under any load, a surgical opinion may be warranted alongside conservative management.
Custom or wide, deep-toe-box shoes are often part of the prescription where bunions are involved, because standard footwear frequently creates direct pressure on the joint.
Hammer toes and claw toes
When toe joints bend and become stiff, they create pressure points on the top of the toe from the shoe and under the ball of the foot from the altered load distribution. Custom orthotics aim to offload the toes and reduce the pressure under the forefoot. Extra-depth or custom shoes that provide enough room for the toe deformity are usually needed alongside the orthotic to make a meaningful difference.
Charcot foot
Charcot foot is a serious condition in which the bones and joints of the foot weaken and change shape in a person with peripheral neuropathy, most commonly related to diabetes. Because sensation is reduced, the damage can progress significantly before pain prompts medical attention.
Custom orthotics in this context are focused on total-contact support and careful pressure redistribution, and they are managed as part of a broader medical team approach. A foot that is red, hot and swollen, particularly in someone with diabetes or neuropathy, requires urgent medical review, not an orthotic appointment.
Rheumatoid arthritis and other arthritic deformities
Joint changes from rheumatoid arthritis can cause significant pain and pressure in the foot, particularly in the forefoot and around the toes. Custom orthotics aim to cushion and redistribute pressure, accommodate the deformity and reduce the load on the most affected joints. As the condition changes over time, the orthotic prescription may need to be reviewed and updated.
Extra-depth or custom footwear is often an important part of managing arthritic foot deformity, because standard shoes tend to create pressure over joints that are already inflamed or misaligned.
Neurological changes
Conditions such as cerebral palsy, stroke and foot drop alter muscle control and foot alignment in ways that standard orthotics cannot always address. An ankle-foot orthosis (AFO) is often the primary device in these situations, working to support alignment and stability across the ankle joint rather than just the foot. Custom orthotics may be used alongside an AFO or in milder presentations where foot alignment is the primary concern.
Leg length difference
Even a small difference in leg length can alter gait mechanics enough to cause pain at the hip, knee, ankle or foot. A heel lift or built-up sole on the shorter side is one of the more straightforward orthotic interventions available. Larger differences usually require a shoe modification rather than an orthotic alone, and the two approaches are often combined.
When Orthotics Alone Are Not Enough
For some presentations, custom orthotics are one part of the solution rather than the whole answer.
The foot assessment determines which combination applies. Where custom orthopaedic shoes or footwear modifications are needed, these can be designed and manufactured at Foot Balance Technology alongside the orthotic prescription.
When Orthotics Alone Are Not Enough
For some presentations, custom orthotics are one part of the solution rather than the whole answer.
The foot assessment determines which combination applies. Where custom orthopaedic shoes or footwear modifications are needed, these can be designed and manufactured at Foot Balance Technology alongside the orthotic prescription.
How Your Orthotics Are Designed and Made
The process starts with the foot assessment: foot posture evaluation, gait analysis using video or pressure mapping, plantar pressure analysis and a review of your footwear and medical history. From there, a 3D scan or cast of the foot is taken to capture its precise shape.
The orthotic is then designed around those findings. The design may vary material density across different zones of the foot, incorporate specific posting angles, add targeted padding or modify the contact surface to address the mechanical issues identified. There is nothing off the shelf that does this. Each device is built around one person's foot, not a size range.
Manufacturing takes about four weeks. A fitting appointment follows, with reviews and adjustments as needed after real-world wear. Dr Sayed Ahmed is involved at every stage.
How Your Orthotics Are Designed and Made
The process starts with the foot assessment: foot posture evaluation, gait analysis using video or pressure mapping, plantar pressure analysis and a review of your footwear and medical history. From there, a 3D scan or cast of the foot is taken to capture its precise shape.
The orthotic is then designed around those findings. The design may vary material density across different zones of the foot, incorporate specific posting angles, add targeted padding or modify the contact surface to address the mechanical issues identified. There is nothing off the shelf that does this. Each device is built around one person's foot, not a size range.
Manufacturing takes about four weeks. A fitting appointment follows, with reviews and adjustments as needed after real-world wear. Dr Sayed Ahmed is involved at every stage.
Costs and Funding
The cost of custom orthotics depends on what the prescription involves. Because no two devices are the same, Foot Balance Technology does not publish a fixed price. The best way to get an accurate figure is to contact us now or raise it at your first appointment.
Funding options include NDIS, icare, My Aged Care, DVA (a referral from an orthopaedic surgeon, rheumatologist or podiatrist is required), workers compensation and many private health funds including Medibank, HCF, BUPA and HealthShare. Medicare does not cover custom orthotics or consultations.
Costs and Funding
The cost of custom orthotics depends on what the prescription involves. Because no two devices are the same, Foot Balance Technology does not publish a fixed price. The best way to get an accurate figure is to contact us now or raise it at your first appointment.
Funding options include NDIS, icare, My Aged Care, DVA (a referral from an orthopaedic surgeon, rheumatologist or podiatrist is required), workers compensation and many private health funds including Medibank, HCF, BUPA and HealthShare. Medicare does not cover custom orthotics or consultations.
Book a Foot Assessment
Foot Balance Technology sees patients at Westmead, Castle Hill and Campbelltown. A referral is not required to book, though one is recommended for complex presentations and may assist with funding claims.
Book a Foot Assessment
Foot Balance Technology sees patients at Westmead, Castle Hill and Campbelltown. A referral is not required to book, though one is recommended for complex presentations and may assist with funding claims.
Frequently Asked Questions
Can custom orthotics correct a severe foot deformity, or do they only manage symptoms?
It depends on whether the deformity is flexible or rigid. A flexible deformity gives the orthotic something to work with, and improved alignment during walking is a realistic outcome. A rigid deformity in an adult cannot be corrected by an orthotic. The aim is to reduce pain, protect vulnerable areas and slow further deterioration.
What is the difference between a flexible and a rigid foot deformity, and how does it change the orthotic?
A flexible deformity corrects when weight is off the foot. A rigid one does not. For a flexible deformity, the orthotic is designed to guide the foot toward better alignment. For a rigid one, it is designed to accommodate the shape of the foot, distribute pressure more evenly and reduce discomfort.
Which foot deformities are most likely to need custom orthotics rather than shop-bought insoles?
Severe flat feet, high arches, bunions, hammer toes, Charcot foot, arthritic deformity and significant leg length differences are the presentations where custom orthotics are most likely to make a meaningful difference. A pharmacy insole is built around an average foot shape and cannot address the specific mechanical issues these conditions involve.
Can custom orthotics help with bunions, hammer toes or severe flat feet?
Yes, though what they can achieve varies by condition and severity. For bunions and hammer toes, orthotics aim to reduce load on the affected joints rather than correct the structural deformity. For severe flat feet, they aim to support the arch and control heel position. Assessment findings determine what is realistic in each case.
Do I need custom shoes as well as orthotics for a complex deformity?
Sometimes. Where the deformity cannot be accommodated in a standard shoe, or where footwear is creating pressure on a painful joint or prominence, custom orthopaedic shoes or medical-grade footwear are usually part of the prescription. The assessment determines what combination is appropriate.
How are custom orthotics made for a deformed or painful foot?
A foot assessment and 3D scan are used to capture the precise shape and pressure distribution of the foot. The orthotic is then designed around those findings, varying material density, adding targeted padding or modifying the contact surface to address the specific mechanical issues present. Manufacturing takes about four weeks.
How long does it take to get used to custom orthotics for a complex foot deformity?
Most people adapt within a few weeks, though this varies. A graduated wearing-in period is usually recommended, starting with a few hours a day and building up, to allow the foot to adjust. Follow-up reviews are scheduled to make adjustments as needed.
Is NDIS, Medicare or private health fund support available for custom orthotics in Sydney?
NDIS, icare, My Aged Care, DVA, workers compensation and many private health funds cover custom orthotics in full or in part. Medicare does not. Contact the clinic to discuss what applies to your situation before your first appointment.
Frequently Asked Questions
Can custom orthotics correct a severe foot deformity, or do they only manage symptoms?
It depends on whether the deformity is flexible or rigid. A flexible deformity gives the orthotic something to work with, and improved alignment during walking is a realistic outcome. A rigid deformity in an adult cannot be corrected by an orthotic. The aim is to reduce pain, protect vulnerable areas and slow further deterioration.
What is the difference between a flexible and a rigid foot deformity, and how does it change the orthotic?
A flexible deformity corrects when weight is off the foot. A rigid one does not. For a flexible deformity, the orthotic is designed to guide the foot toward better alignment. For a rigid one, it is designed to accommodate the shape of the foot, distribute pressure more evenly and reduce discomfort.
Which foot deformities are most likely to need custom orthotics rather than shop-bought insoles?
Severe flat feet, high arches, bunions, hammer toes, Charcot foot, arthritic deformity and significant leg length differences are the presentations where custom orthotics are most likely to make a meaningful difference. A pharmacy insole is built around an average foot shape and cannot address the specific mechanical issues these conditions involve.
Can custom orthotics help with bunions, hammer toes or severe flat feet?
Yes, though what they can achieve varies by condition and severity. For bunions and hammer toes, orthotics aim to reduce load on the affected joints rather than correct the structural deformity. For severe flat feet, they aim to support the arch and control heel position. Assessment findings determine what is realistic in each case.
Do I need custom shoes as well as orthotics for a complex deformity?
Sometimes. Where the deformity cannot be accommodated in a standard shoe, or where footwear is creating pressure on a painful joint or prominence, custom orthopaedic shoes or medical-grade footwear are usually part of the prescription. The assessment determines what combination is appropriate.
How are custom orthotics made for a deformed or painful foot?
A foot assessment and 3D scan are used to capture the precise shape and pressure distribution of the foot. The orthotic is then designed around those findings, varying material density, adding targeted padding or modifying the contact surface to address the specific mechanical issues present. Manufacturing takes about four weeks.
How long does it take to get used to custom orthotics for a complex foot deformity?
Most people adapt within a few weeks, though this varies. A graduated wearing-in period is usually recommended, starting with a few hours a day and building up, to allow the foot to adjust. Follow-up reviews are scheduled to make adjustments as needed.
Is NDIS, Medicare or private health fund support available for custom orthotics in Sydney?
NDIS, icare, My Aged Care, DVA, workers compensation and many private health funds cover custom orthotics in full or in part. Medicare does not. Contact the clinic to discuss what applies to your situation before your first appointment.
Reviewed by Dr Sayed Ahmed, Certified Pedorthist CM Australia
Dr Ahmed holds Australia's first PhD in Pedorthics and is the founder of Foot Balance Technology
Reviewed by Dr Sayed Ahmed, Certified Pedorthist CM Australia
Dr Ahmed holds Australia's first PhD in Pedorthics and is the founder of Foot Balance Technology
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Custom Orthotics for Complex Foot Deformities