Congenital hallux varus
Congenital hallux varus is an uncommon deformity present from birth in which the big toe points towards the inner side of the foot, away from the second toe. It can be caused by problems with the ligaments and other soft tissues, differences in bone development or a fibrous band that holds the toe out of line. In some children it is associated with a curve of the forefoot that gives the foot a C shape.
- Typical age
- From birth
- Also known as
- Big toe pointing inwards
What is it?
Congenital hallux varus is an uncommon malformation in which the big toe points towards the inner side of the foot, away from the second toe. This position widens the gap between the two toes and can change the shape of the forefoot. It can affect one or both feet and vary in severity.
One possible cause is a problem with the soft tissues around the first metatarsophalangeal joint, at the base of the big toe. In some cases there is an abnormal fibrous band, similar to a ligament, that pulls on the toe and helps keep it pointing inwards. Tightness of the joint capsule and ligaments, as well as differences in the development of the first metatarsal, may also play a part.
When hallux varus is accompanied by an inward curve of the front of the foot, a characteristic C shape can appear. This may be related to associated metatarsus adductus or other structural differences. That is why it is important to assess both the position of the big toe and the alignment of the rest of the forefoot.
Congenital hallux varus is rare, and there is no well-established frequency figure for all its types. A specialist examination identifies the structures involved so that treatment can be tailored or, if needed, the deformity corrected.
Associated malformations
Congenital hallux varus can occur on its own or together with other congenital foot malformations. The most notable are polydactyly of the big toe, meaning an extra big toe or duplicated bone elements, and syndactyly, in which two or more toes are partly or fully joined.
In some cases hallux varus is part of a wider pattern of malformations, such as Greig cephalopolysyndactyly syndrome, a rare genetic condition that can combine polydactyly, syndactyly and certain craniofacial features. When there are several congenital anomalies, a full examination is important and the need for a genetic assessment should be considered.
Identifying these associations helps to understand the anatomy of the foot better and to plan individualised treatment, especially when surgery is being considered.
Signs parents may notice
The most common signs are:
- Big toe pointing inwards: the toe points away from the second toe instead of towards it.
- Wide gap between the first and second toes: the space may be larger than usual.
- C-shaped foot: the front of the foot may curve inwards, especially if there is associated metatarsus adductus.
- Differences between the feet: the deformity may affect one or both.
- Difficulty wearing shoes: the position of the toe or the shape of the forefoot can make shoes hard to fit.
- Rubbing or redness: may appear where the foot touches the shoe.
- Changes in walking: in older children, the deformity can change how the foot bears weight or cause discomfort when walking.
A visible deformity does not necessarily mean the child is in pain or needs surgery. Flexibility, anatomy and the effect on function all need to be assessed.
When to see a specialist
An assessment by a paediatric orthopaedic specialist is advisable if:
- The big toe is clearly pointing inwards from birth.
- The deformity seems to increase with growth.
- The foot has a marked curve or C shape.
- The toe cannot be gently straightened by hand.
- It is hard to find comfortable shoes.
- There is pain, rubbing or difficulty walking.
- There are other anomalies of the toes, metatarsals or hands.
Congenital hallux varus is not usually urgent.
How is it diagnosed?
The diagnosis is based on physical examination and, when indicated, imaging.
The specialist examines the position of the big toe, the gap from the second toe and the overall shape of the foot. They also check whether the deformity is flexible or rigid, whether it can be gently corrected and whether there is abnormal soft-tissue tightness.
It is especially important to determine whether a fibrous band is helping to hold the toe out of line, and whether there is metatarsus adductus or another associated bone abnormality.
X-rays show the length and orientation of the first metatarsal, the alignment of the joints and any anomalies of bone development. In selected cases, other tests may be needed to study the soft tissues in more detail or to plan surgery.
Examining both feet and asking about any family history are also part of the assessment.
Treatment
Treatment depends on age, how flexible the deformity is, any associated anatomical anomalies and the discomfort it causes. The aim is to achieve a functional position of the big toe, make it easier to wear shoes and improve foot alignment when needed.
Conservative treatment
Conservative measures may include:
- Corrective splints or spacers: can be used in selected cases to keep the toe in a better position until surgery is carried out.
These measures do not correct the deformity, especially if a fibrous band is holding the toe out of line or there is a structural bone anomaly.
Surgical treatment
The technique is tailored to the structures causing the deformity. Several procedures may need to be combined:
- Soft-tissue release: frees the structures holding the toe out of line, including an abnormal fibrous band when present.
- Correction of tendons and the joint capsule: may be needed to balance the forces acting on the toe and maintain good alignment.
- Bone correction: if there is a significant abnormality of the first metatarsal or other bones, osteotomies may be performed to improve their position.
- Correction of associated metatarsus adductus: when the forefoot is markedly curved, this deformity may also need treatment to achieve a good overall correction.
In some cases temporary wires are used to hold the position while healing takes place. The operation is usually done under general anaesthesia and may require immobilisation in a cast. Hospital stay and recovery time depend on how complex the correction is.
There is no single technique for all patients. Planning must take into account age, remaining growth, joint flexibility and the presence of bone anomalies.
Outlook and recovery
The outlook depends on the type of deformity and the treatment carried out.
- Conservative treatment: has no real role in correcting hallux varus; only wide footwear is recommended before the decision on surgery.
- After surgery: a cast may be needed for several weeks to protect the correction.
- School: a return is usually possible before a return to sport, as long as the pain is under control and getting around is safe.
- Return to sport: depends on bone healing, recovery of movement and the stability of the toe and forefoot.
Check-ups confirm that the toe stays in a good position and that the correction does not restrict movement too much. In young children, follow-up throughout growth is especially important.
Frequently asked questions
Does congenital hallux varus correct itself?
No. If there is a rigid deformity or a structural anomaly, it can persist and need treatment.
How is it related to a C-shaped foot?
The C shape can appear when the forefoot turns inwards, as happens with associated metatarsus adductus. The fibrous band and soft-tissue changes can contribute to the drift of the big toe, but it is important to identify which structures are involved in each child.
Is surgery always needed?
In most cases, yes.
Does surgery fully correct the deformity?
The aim is to improve alignment and function, but the result depends on the initial anatomy and the structures involved. In some cases some drift may remain or further treatment may be needed.
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.