Syndactyly of the toes

In brief

Syndactyly of the toes is a congenital malformation in which two or more toes are joined together, usually by skin and sometimes also by deeper tissues or bone. It is a fairly common condition that, in most cases, causes no pain and does not affect walking. Treatment depends on the type of connection, the symptoms and whether there are other associated malformations.

Typical age

From birth

Also known as

Webbed toes · Joined toes · Fused toes

What is it?

Syndactyly is a developmental condition that arises before birth, when the toes do not fully separate as the foot forms. It may affect two or more toes and occur on one foot or both. The most common form is a connection between the second and third toes.

It is a fairly common congenital malformation. Syndactyly of the toes is usually more common than that of the fingers and often runs in families. It may occur on its own, without other abnormalities, although sometimes it is part of a genetic syndrome or associated with other toe and foot malformations.

There are different types depending on the extent and structures involved. In simple syndactyly, the toes are joined only by skin and soft tissue. In complex syndactyly, there may also be connections between the bones or abnormal bone development. The connection may be partial, if it affects only part of the toes, or complete, if it reaches the tips.

In most children, syndactyly of the toes is mainly an anatomical and cosmetic feature that does not significantly affect walking. However, if it makes wearing shoes difficult, causes rubbing or comes with other deformities, a specialist assessment may be needed to decide whether to treat it.

Signs parents may notice

The most common signs are:

• Two or more joined toes: a skin connection between the toes may be seen from birth.
• Webbing between the toes: the connecting skin may cover only the part near the base or extend along the whole toe.
• Toes that look different: the joined toes may have an unusual shape or length.
• Nail changes: in some cases the shape or separation of the nails may be affected.
• Difficulty wearing certain shoes: especially if the connection comes with a deformity or affects several toes.
• Rubbing or skin irritation: from contact between the toes or pressure from shoes.

Simple syndactyly is usually painless and does not stop a child walking normally.

When to see a specialist

It is advisable to see the paediatrician or a paediatric orthopaedic specialist if:

• The connection between the toes is extensive or affects several toes.
• There is an associated deformity or a marked difference in toe length.
• The child has pain, frequent rubbing or difficulty with shoes.
• The syndactyly comes with extra toes, nail abnormalities or other foot anomalies.
• There are other congenital malformations or a family history that call for a broader assessment.
• The family wants to know about the options for surgical correction.

When is it urgent?

Isolated congenital syndactyly is not usually an emergency. If there is sudden swelling, severe pain, changes in colour or temperature of the toes, or a skin wound with signs of infection, a medical assessment is needed.

How is it diagnosed?

The diagnosis is usually made by physical examination. The specialist notes which toes are joined, how far the connection extends and whether movement is normal. They also check the shape of the nails, toe length, foot alignment and any other malformations.

In simple syndactyly, imaging tests are generally not needed. If a bony connection is suspected, there are significant deformities or surgery is being planned, X-rays may be requested to study the anatomy of the toes and metatarsals.

When syndactyly occurs alongside other congenital anomalies, it may be advisable to investigate further to rule out an associated genetic condition.

Treatment

Treatment depends on the extent of the connection, the structures involved and any problems it causes.

Conservative treatment

Most children with simple syndactyly of the toes need no treatment. If the toes are well aligned, there is no pain and shoes are comfortable, monitoring progress during growth is enough.

Conservative measures may include:

• Comfortable footwear: shoes with enough room for the toes, avoiding unnecessary pressure.
• Skin care: keeping the area where the toes join clean and dry to reduce irritation.
• Clinical follow-up: checking how the foot develops and spotting possible functional problems during growth.

Insoles or toe separators are not usually needed for isolated syndactyly and do not permanently separate joined toes.

Surgical treatment

Surgery may be considered when syndactyly causes functional problems, significant difficulty with shoes, recurrent irritation or an associated deformity that justifies correction. It may also be considered for cosmetic reasons after explaining the expected benefits and possible risks to the family.

The operation usually separates the toes using skin flaps. Because there may not be enough skin to cover the surfaces exposed by the separation, skin grafts are sometimes needed. The technique depends on the extent of the connection and the anatomy of the toes.

If there is complex syndactyly with a bony connection, additional procedures may be needed. In children, surgery is usually performed under general anaesthesia, and discharge may be the same day or after a short stay, depending on the operation and the patient.

Risks include wound-healing problems, infection, scar contracture, incomplete separation and the need for another operation. So surgery is not routinely indicated when the connection causes no problems.

Outlook and recovery

The outlook for simple syndactyly is usually good, especially when there are no other foot problems.

• Without surgery: in most cases the child can walk, run and play sport normally. No immobilisation is needed.
• After surgery: a protective dressing is usually used and, in some cases, a post-operative shoe or temporary immobilisation.
• First weeks: the wound is checked, healing is monitored and pressure on the operated toes is avoided.
• Return to school: depends on pain, the type of dressing and whether the child can get around safely.
• Return to sport: delayed until the wound has healed and the specialist confirms that weight-bearing and activity are safe.

Initial healing usually takes several weeks, although scars continue to mature for months. Exact timescales depend on the extent of the syndactyly and the technique used.

Check-ups monitor healing, toe movement and how the scars develop during growth.

Frequently asked questions

Does syndactyly of the toes affect walking?

In most cases, no. Children with simple syndactyly usually walk, run and play sport without limitations.

Do the toes need to be separated surgically?

Not always. If the connection causes no pain, footwear problems or functional problems, surgery is usually not needed.

Is syndactyly inherited?

There may be a family tendency, although it also appears in children with no family history. If there are several associated malformations, further investigation may be indicated.

Can it correct itself with growth?

Congenitally joined toes do not usually separate on their own. However, if it causes no problems, it may not need treatment.

Does surgery leave scars?

Yes. Separation requires rebuilding the skin between the toes, so scars remain. The surgical technique aims for functional separation and adequate skin cover while minimising complications.

This page is for general information and does not replace an assessment by a specialist. If you are worried about your child's foot, talk to their paediatrician or book an appointment.