Partial foot and ankle-level prostheses
Prosthetic solutions that differ according to anatomical level, from toe and forefoot loss to ankle disarticulation.
What is partial foot amputation?
Partial foot amputation refers to situations in which part of the foot, such as the toes, forefoot or midfoot, is absent. The foot is a complex structure that carries body weight during walking, initiates the step and provides balance; the absence of part of this structure may change load distribution, pressure points and the rollover movement of the step.
In amputations at this level, the knee and usually the ankle joints are preserved. The preserved joints provide an important advantage in allowing the person to continue using their own muscle strength and natural movement. The aim of the solution to be applied is to replace the function of the missing area as far as possible in order to balance the load on the sole of the foot, support rollover during the step, provide fit inside the shoe and protect the skin health of the remaining foot tissue. The right approach is determined individually according to the location and size of the missing area.
Solutions at the partial foot level cover a wide range; in some cases a simple support used inside the shoe is sufficient, while in others applications that enclose the foot more extensively may be needed. This content aims to provide a general overview of these options; which solution is suitable for whom is determined only through a physician's assessment and the practitioner's examination.
Syme (ankle disarticulation) level
At the Syme level, amputation is performed through the ankle joint; the length of the lower leg and the natural knee joint are preserved, but the foot is absent. This level differs from toe, forefoot or midfoot loss and usually requires a more extensive prosthesis than an in-shoe filler or insole.
Because of the anatomical width at the distal end, individual solutions such as a window, door or flexible opening in the socket may be used so that the prosthesis can be put on and taken off. The structure usually consists of a socket enclosing the lower leg and a prosthetic foot suited to a low build height; no artificial knee joint is used.
- The natural knee joint and lower leg length are preserved.
- The ankle joint and natural foot are absent.
- A low-profile prosthetic foot solution is needed instead of a long pylon.
- The socket donning opening and load transfer are planned individually.
Levels of partial foot amputation (overview)
The classification below is for general information; each person's situation is different and the assessment is made by the physician.
Toe level
Situations in which one or more toes are absent. Balance and pressure distribution may be affected during the push-off (toe-off) phase of walking; an in-shoe filler and insole support are often considered.
Forefoot level
Situations in which the toes and the forefoot section are absent. Because the support surface in the final phase of the step is shortened, solutions that support load distribution and rollover become important.
Midfoot level
Situations in which a larger part of the foot is absent. As the remaining support surface is reduced, supportive solutions that also cover the ankle or partial foot prostheses may be considered.
The importance of preserving the knee and ankle
At the partial foot level, preservation of the knee and ankle joints is decisive in allowing the person to maintain their natural movement pattern. Thanks to the preserved joints, the foot can adapt more flexibly to the ground and energy transfer during the step can remain more natural.
For this reason, when planning a solution, the goal is not only to fill the missing area but also to keep pressure on the skin within safe limits while supporting the movement and muscle strength of the remaining joints. Appropriate support aims to have a positive effect on comfort and balance in daily activities.
Which solutions are considered?
There is no single standard solution at the partial foot level; the approach is determined according to the remaining foot structure, skin condition and the person's activity level. In some cases an in-shoe filler and insole may be sufficient, while for larger deficiencies supportive solutions that also cover the ankle or partial foot prostheses are considered.
- Supporting load distribution with an in-shoe filler and a custom-made insole
- Ankle-foot supportive solutions that facilitate rollover
- Fitting a partial foot prosthesis for more extensive deficiencies
- Individual adaptations that take skin health into account and manage pressure points
A closer look at types of solutions
In-shoe filler
Applications that aim to reduce the empty space inside the shoe by filling the missing area and to balance the support surface.
Custom-made insole
Intended to protect sensitive areas and support comfort by distributing pressure on the sole of the foot over a wider area.
Ankle-foot supportive solutions
By also covering the ankle, these aim to support balance while standing and the rollover movement of the step.
Partial foot prosthesis
For larger deficiencies, a custom-made device intended to re-create the support surface by enclosing the remaining foot.
Load distribution and rollover
In a healthy step, the foot carries the body forward with a smooth rollover movement from heel to toe. When part of the foot is absent, this rollover may be shortened and pressure may concentrate on the narrow remaining area.
Appropriate solutions aim to distribute the load more evenly by widening the support surface and to restore continuity during the step. In this way, the fluency of walking is supported while efforts are made to reduce excessive pressure on certain points.
Balancing load distribution is important not only for comfort but also for the long-term protection of the remaining foot tissue. Since pressure building up in certain areas may lead to irritation or discomfort over time, the aim of the solution is to share the load as evenly as possible across the remaining foot structure. This balance is assessed together with shoe selection and regular follow-up.
Shoe fit
Most partial foot solutions are designed to be used inside a shoe. The internal volume of the shoe, the flexibility of its sole and the heel height are important for the solution to be positioned correctly and to work in a balanced way.
The aim in choosing a shoe is to provide a secure hold without compressing the remaining foot and to protect pressure points. The appropriate type of shoe and any necessary adaptations are determined in line with the practitioner's recommendations.
Skin health and pressure points
At the partial foot level, the remaining foot tissue and the surgical site may be more sensitive to increased pressure and friction. For this reason, it is recommended that the skin be observed regularly and monitored for redness, pressure marks, blistering or irritation.
In some situations where circulation or sensation may be affected (for example, sensitivities related to diabetes), protecting skin integrity is especially important. This general information does not replace follow-up by a physician; if any change is noticed, it is appropriate to consult a physician.
Balance, walking and daily life
Balance
Reorganizing the support surface aims to contribute to balance while standing and changing direction.
Walking
Supporting the rollover movement may help make steps more fluent and less tiring.
Daily activities
An appropriate solution is intended to support comfort in walking, working while standing and movements throughout the day.
Fit and daily use
How well the solution fits into daily life is assessed together with usage habits, shoe selection and regular follow-up.
Foot and shoe fit with a Syme prosthesis
The shape of the low-profile prosthetic foot, the internal volume of the shoe and the heel height are assessed together. The fit is adjusted individually to support correct positioning of the prosthetic foot inside the shoe and balanced ground contact.
Appearance and cover
The carbon socket and mechanical prosthetic foot can be used uncovered; in suitable cases, the connection area can be given a more unified appearance with a closed-cell foam and textile cover. The choice of cover is planned so as not to obstruct access to adjustment and inspection points.
The fitting process
Physician's Assessment
The process begins with a specialist physician's assessment and a prescription/medical report; the level of amputation and the person's general condition are reviewed.
Measurement and Planning
The remaining foot structure, skin condition and activity level are assessed; the appropriate solution and service plan are determined.
Fabrication and Fitting Trial
The custom-made solution is fabricated; during the trial stage, adjustments are made for load distribution, shoe fit and comfort.
Training in Use and Follow-up
Information is provided on use and skin monitoring; regular follow-up is provided for check-ups and adjustments when necessary.
Frequently asked questions
Is a prosthesis needed for partial foot loss too?
The appropriate solution varies according to the location and size of the missing area. In some cases an insole and in-shoe filler may be sufficient, while in others ankle-foot supportive solutions or a partial foot prosthesis are considered. The decision is made through a physician's assessment.
Can I wear normal shoes?
Most solutions are designed to be used inside a shoe. The appropriate type of shoe, sole flexibility and any necessary adaptations are determined with the practitioner's recommendations.
Am I at an advantage because my knee and ankle are preserved?
Preservation of the knee and ankle is generally a positive factor in allowing the person to continue using their own movement and muscle strength. However, each person's needs are different and the solution is planned individually.
What should I pay attention to for skin health?
It is recommended that the remaining foot tissue be observed regularly and monitored for redness, pressure marks or irritation. If any change is noticed, it is appropriate to consult a physician. This general information does not replace follow-up by a physician.
How long does it take to get used to the solution?
The adjustment period varies from person to person and may be gradual. Adaptation is assessed together with usage habits and regular check-ups; the process is planned under the practitioner's guidance.
How will my balance and walking be affected?
An appropriate solution aims to support balance and rollover by reorganizing the support surface. Results vary from person to person and are determined through a physician's assessment.
This content is for informational purposes; please consult your physician for diagnosis and treatment. Applications are carried out at our licensed center locations in line with a specialist physician's prescription/medical report.