Silicone orthoses: Custom-made relief for painful toes

What lies behind it

Human toe bones consist of phalanges connected to one another by delicate interphalangeal joints. In a healthy foot, the toes roll off evenly during the push-off phase and stabilise the forefoot. If foot statics change due to the collapse of the transverse arch or a malposition of the metatarsal bones, this balance is disrupted. The toes deviate upwards, downwards, or laterally. Claw toes, hammer toes, or hallux valgus develop. Constant pressure from footwear on the altered joint contours causes mechanical overload of the skin and underlying tissue.

A podiatric silicone orthosis is an individually designed medical aid made of medical-grade elastomer. The material is mixed in liquid or kneadable form and cures directly on the patient's foot. A fundamental distinction is made between condensation-curing and addition-curing silicones. Addition-curing silicones are characterised by high dimensional stability, skin tolerance, and a long service life. They do not shrink during curing and retain their elastic properties over many months.

The biomechanics of an orthosis are based on targeted pressure redistribution. The silicone absorbs kinetic energy upon impact and redirects it to painless surrounding areas. In addition, the choice of material hardness, measured in Shore A, determines the precise function. Soft materials with a hardness of Shore A 10 to 20 primarily serve to cushion sensitive skin areas. Medium-firm to firm materials with values of Shore A 25 to 40 can gently correct flexible toe deformities or replace lost phalanges following partial amputations as a resection orthosis.

Typical signs

Affected individuals usually notice an indication for a silicone orthosis through recurring skin changes. A classic sign is the formation of corns between the toes, medically referred to as clavus interdigitalis. Due to local pressure, these hyperkeratotic lesions penetrate into the deeper dermis in a wedge shape and cause sharp, stabbing pain during walking. Pressure points on the tips of the toes or over the proximal interphalangeal joints, where firm hyperkeratotic caps form, are also common.

In addition to localized hyperkeratosis, redness, swelling, or bursitis often occur over prominent bony prominences. Bunionettes, also known as tailor's bunions, frequently appear on the outer edge of the fifth toe, while hallux valgus leads to painful pressure points on the bunion. Affected individuals often attempt to avoid pain by altering their gait pattern. This compensatory movement places abnormal stress on the ankle joint, knee, and pelvis.

An accurate differential diagnosis is essential. Not all skin redness in the toe area is purely mechanical in origin. Fungal skin infections in the interdigital spaces present with similar symptoms, including redness and scaling, but require antifungal therapy. Inflammatory changes in rheumatoid arthritis or gouty tophi deposits must be differentiated. A silicone orthosis differs fundamentally from an orthotic insole. While insoles support the plantar surface of the foot, the orthosis acts directly on and between the digital structures.

Everyday causes

The causes of painful pressure points on the toes are multifaceted. Wearing footwear that is too tight, pointed, or rigid is among the most common triggers. When the forefoot is compressed inside the shoe, the phalanges press against one another. High-heeled shoes exacerbate this effect, as the entire body weight shifts forward onto the metatarsal heads and toes.

Anatomical changes in foot architecture play an equally significant role. In splayfoot, known as metatarsus latus, the metatarsal bones fan out. The transverse arch flattens and reduces the space available for the toes inside the shoe. The muscular equilibrium between the short and long toe flexors and the extensor tendons becomes unbalanced. The toes contract into a claw-like position. In hallux valgus, the hallux drifts laterally and displaces adjacent toes, which can lead to overlapping toes.

Systemic underlying conditions significantly alter tissue structure and pain perception. People with diabetes mellitus frequently suffer from peripheral sensory neuropathy. They often detect damaging pressure inside the shoe only when deep tissue damage is already present. In peripheral arterial disease, poor circulation causes minor pressure points to develop rapidly into chronic wounds. Improper foot care, such as cutting nail borders too deeply or excessive filing, also damages the skin's barrier function.

When medical assessment is required

A podiatric silicone orthosis is an effective medical aid for relief, but it does not replace medical diagnostics in severe clinical findings. If you notice open wounds, ulcers, or weeping lesions on the toes, a medical examination must be conducted immediately. This applies in particular to patients with diabetes mellitus or circulatory disorders.

Signs of an acute bacterial infection require prompt action. Watch for spreading redness, localized heat, throbbing pain, pus formation, or accompanying fever. In cases of irreversible, rigid toe deformities with pronounced structural bone changes, an orthopaedic surgeon should also be consulted to evaluate surgical correction options.

Podiatric care always takes place within an interdisciplinary network. If pain occurs suddenly without a recognizable mechanical trigger or if pedal pulses are not palpable, the vascular or diabetological status must be evaluated medically prior to fitting an orthosis.

What podiatric treatment can achieve

The fabrication of a custom-made silicone orthosis begins with a thorough podiatric assessment. In our practice, we first evaluate the mobility of the toe joints. We determine whether a deformity is flexible, semi-flexible, or completely rigid. Depending on the findings, we select the appropriate silicone compound and the required Shore hardness. In cases of extremely sensitive skin or existing interdigital hyperkeratosis, we frequently combine different silicone components to achieve optimal protective efficacy.

The foot is prepared in accordance with strict hygiene guidelines. Prior to fitting, we inspect the skin carefully to ensure it is intact. The two-component silicone is then precisely dosed. The curing agent is kneaded homogeneously into the base compound. The processing steps require rapid and precise work, as polymerisation begins within two to four minutes.

Moulding takes place directly on the patient's foot. The kneadable mass is fitted precisely into the interdigital space or sculpted around the affected toe. During the curing phase, the podiatrist guides the foot into a corrected, biomechanically neutral position. The patient remains motionless until the material is fully cross-linked. After removing the raw orthosis, fine mechanical finishing is performed.

Using specialized rotary instruments and sanding caps, the edges of the orthosis are milled thin. Smooth transitions prevent the borders from chafing inside the shoe. Relief recesses are incorporated precisely at the locations of the corn or pressure point. Following final shaping, we evaluate the fit inside the patient's shoe.

A clinical case study illustrates the effect. A 62-year-old female patient presented with a painful, recurrent corn between the third and fourth toes. Due to splayfoot, the heads of the proximal phalanges continuously rubbed against one another. Following professional removal of the clavus, we fabricated an interdigital silicone orthosis with a Shore hardness of A 22. The medical device gently separates the joints without overly restricting space in the forefoot area. At the follow-up examination four weeks later, the skin area was symptom-free and free of irritation.

Fabrication usually takes 30 to 45 minutes. With daily use and proper care, a professionally crafted silicone orthosis lasts approximately six to eighteen months. During this period, we conduct regular follow-up appointments to check the fit and adjust the material if necessary. Performing podiatric work requires sound specialist knowledge, as acquired through comprehensive training or specialization. Further information on our qualifications can be found at /en/sectoral-practitioner and /en/about.

What you can do yourself

Proper daily care is essential to ensure that your silicone orthosis maintains its elasticity and hygiene over a long period. The material absorbs perspiration and skin dander, which, without regular cleaning, can lead to material fatigue or skin irritation.

The following care steps should be performed every day:

1. Clean the orthosis thoroughly every evening under lukewarm running water using a mild, soap-free washing lotion.
2. Carefully dry the medical aid with a soft cloth and allow it to air-dry completely.
3. After drying, lightly dust the orthosis with medical talcum powder or baby powder to prevent the silicone from sticking.
4. Always store the medical device at room temperature, protecting it from direct sunlight and extreme heat.
5. Wear the orthosis exclusively in shoes that provide sufficient width and height in the forefoot area.

Acclimatisation should take place gradually. Wear the medical device for approximately one to two hours on the first day in your familiar environment. Increase the wearing time by one hour each day. This gives the tissue and skin the opportunity to adapt to the altered pressure distribution. After about ten days, all-day wear should be possible without difficulty.

When putting on the orthosis, take care not to overstretch or pull it excessively. Spread the toes slightly and insert the medical aid carefully. Well-fitting socks provide additional fixation, preventing the orthosis from slipping inside the shoe. Additional treatments for hyperkeratosis can be found at /en/services.

Common errors

In podiatric practice, we frequently observe typical application errors that impair the effectiveness of the orthosis or lead to new complaints. The most common error is wearing the orthosis in shoes that are too tight. If the shoe does not offer sufficient room, the additional material in the toe space increases total pressure. This leads to painful pressure points on previously healthy skin areas.

Further errors in handling the medical device include:

• Cleaning with aggressive disinfectants or pure alcohol embrittles the silicone, making it brittle.
• Washing in a washing machine or drying on a radiator destroys the molecular structure of the elastomer.
• Unauthorised trimming or grinding of the orthosis with household scissors creates sharp edges that can cut deeply into the skin.
• Wearing the orthosis on unhealed, open wounds drastically increases the risk of infection.

Skipping the acclimatisation phase is equally detrimental. Wearing a new orthosis immediately for twelve consecutive hours on a long hike risks painful blister formation. If pain, numbness, or increased redness occurs while wearing the device, the orthosis must be removed immediately and its fit re-evaluated by a podiatrist.

Scientific evidence and context

The efficacy of custom-fabricated silicone orthoses in the treatment of digital foot deformities is well documented in podiatric and orthopaedic literature. Biomechanical studies demonstrate that custom orthoses achieve a significantly higher reduction in pressure at the affected interphalangeal joints compared with prefabricated ready-made pads [1]. By precisely replicating the individual topography, the contact area is enlarged, reducing the maximum force per unit area according to physical principles of pressure distribution.

Clinical observational studies confirm a high success rate in the prevention of recurrent clavi interdigitales. In patients with recurrent corns, consistent use of a custom-made silicone orthosis significantly lowered the recurrence rate [2]. The study participants' quality of life improved rapidly as pain-free walking was restored.

In diabetology, silicone orthoses play an important role in primary and secondary prevention. Studies on pressure offloading in patients with diabetic foot syndrome show that custom-fitted orthoses made of soft silicones effectively reduce peak pressures at the toe tips and hammer toe joints [3]. This significantly reduces the risk of neuropathic ulceration, provided regular professional monitoring is ensured [4]. Adherence to strict quality and hygiene standards is a fundamental prerequisite, as can also be read at /en/hygiene.

Treatment in Memmingen

At our practice, FREITAG® Podologie GmbH in Memmingen, we handcraft custom silicone orthoses specifically for your feet with high precision. We take the time to thoroughly analyze your foot architecture and select the optimal material combination for your clinical condition. Our catchment area extends across the entire Unterallgäu, Upper Swabia, and the Allgäu region.

If you suffer from recurrent pressure points, painful corns, or toe deformities, please make an appointment at our practice premises at Kempterstr. 25 in Memmingen. You can reach us by telephone or directly via our contact form at /en/contact. We support you step by step in returning to a symptom-free daily life.

Specific designs of pressure-relief and corrective orthoses

The structural design of a silicone orthosis is strictly guided by the underlying biomechanical pathology. A widely used design is the purely interdigital orthosis. It rests in the space between two adjacent phalanges. The purpose of this design is to separate bony prominences in cases of clavus interdigitalis or mild hallux valgus deformity. The material conforms precisely to the lateral surfaces of the phalanges, creating a broad contact surface that effectively cushions localized pressure peaks.

For more complex deformities such as overlapping toes, extended shell orthoses or ring orthoses are used. These designs enclose the affected toe three-dimensionally. They guide the joint from dorsal to plantar or correct lateral deviation. In a pronounced hammer toe, the orthosis contours under the apical pulp of the toe and gently elevates the distal phalanx. This leverage offloads the proximal interphalangeal joint, preventing the upper surface of the toe from rubbing against shoe leather.

Replacement and resection orthoses represent a special category. Following a partial toe amputation, for instance within the context of diabetic foot syndrome or trauma, the forefoot loses an important structural pillar. The remaining toes tend to drift into the resulting gap. A custom-fabricated resection orthosis fills this void precisely. It usually consists of a firm silicone core with a Shore A 35 hardness, encased in a softer silicone layer. This maintains forefoot stability while protecting sensitive scar tissue.

Distinction from off-the-shelf products and combination therapies

Pharmacies and medical supply stores offer numerous prefabricated gel pads, toe separators, and silicone rings. These off-the-shelf products are usually made of very soft, highly elastic thermoplastics or hydrogels. They offer initial, short-term relief for mild irritation. However, these mass-produced items lack individual customization to specific foot morphology. Poorly fitting off-the-shelf pads slip quickly during walking. They can further restrict space inside the shoe, thereby creating new pressure points.

A podiatric silicone orthosis often achieves its maximum efficacy when combined with other orthopaedic measures. While the orthosis acts directly on the digital structures, a custom orthotic insole corrects whole-foot statics from the plantar side. Collapse of the transverse arch is offloaded by retrocapital support, relieving tension on the extensor tendons of the toes. Only through this combination can the correction of flexible deformities be sustained long term.

Provision requires close coordination between podiatry, orthopaedic shoe technology, and treating medical specialists. When an orthosis is made, footwear must also be suitable. The orthopaedic shoe technician can create the necessary space inside the shoe through forefoot widening or a metatarsal rocker/butterfly roller. In our practice in Memmingen, we collaborate closely with regional medical specialists across Unterallgäu and Upper Swabia, ensuring that conservative measures integrate optimally.

Cost coverage and billing practices

The fabrication of a custom silicone orthosis is a medically indicated podiatric service. Statutory health insurance patients require a medical prescription for cost coverage by their health insurance fund. The prescription is typically issued by orthopaedic specialists, diabetologists, or general practitioners. The prescription must contain a precise diagnosis, such as a painful hammer toe deformity with corn formation or post-partial amputation status.

Statutory health insurance funds currently cover the costs of podiatric silicone orthoses only under specific conditions or through case-by-case decisions. For patients with documented diabetic foot syndrome and an established risk level, the criteria are particularly strict. Patients frequently submit an application for cost coverage to their health insurance fund prior to fabrication, attaching a cost estimate from the podiatric practice.

For private health insurance, reimbursement depends on the individually agreed policy terms. Billing is conducted transparently according to fee schedules or on the basis of a fee agreement. Investing in a custom-made orthosis protects tissue sustainably against recurrent damage. Precise pressure offloading increases walking distance for affected individuals and prevents lengthy complications.