How Common Is Bilateral Clubfoot? Statistics and What Parents Need to Know
How common is bilateral clubfoot? Bilateral clubfoot — where both feet are affected — occurs in approximately 40-50% of all clubfoot cases. Since clubfoot itself affects around 1 in 1,000 births in the United Kingdom, bilateral clubfoot is present in roughly 1 in 2,000 to 1 in 2,500 births, or approximately 280-350 babies per year in the UK. While receiving a diagnosis of bilateral clubfoot can feel particularly daunting, it's important to know that treatment is equally effective for both feet and outcomes are excellent.
This article explores the prevalence of bilateral clubfoot, how it compares to unilateral (one-sided) clubfoot, the implications for treatment, and answers the most common questions parents have when both feet are affected.
Bilateral vs Unilateral Clubfoot: The Statistics
When a baby is born with clubfoot, the condition may affect one foot or both. The breakdown across all clubfoot cases is remarkably consistent across different populations:
- Unilateral clubfoot (one foot): 50-60% of cases
- Bilateral clubfoot (both feet): 40-50% of cases
When clubfoot is unilateral, the right foot is slightly more commonly affected than the left, though the reason for this asymmetry is not fully understood.
These figures mean that bilateral clubfoot is not unusual at all — it represents nearly half of all clubfoot cases. If your baby has bilateral clubfoot, they are in a large and well-supported group of families. For a broader understanding of what bilateral clubfoot means, visit our guide to how bilateral clubfoot happens.
UK-Specific Numbers
In the United Kingdom, where approximately 700 babies are born with clubfoot each year:
- Approximately 280-350 babies have bilateral clubfoot
- Approximately 350-420 babies have unilateral clubfoot
Every NHS clubfoot clinic sees bilateral cases regularly, and the treatment teams are thoroughly experienced in managing both feet simultaneously.
Does Bilateral Clubfoot Indicate Greater Severity?
One of the first questions parents ask when both feet are affected is whether bilateral clubfoot is "worse" than unilateral. The answer is nuanced:
In Terms of Treatment
The Ponseti method works equally well for bilateral clubfoot. Both feet are cast simultaneously, and the treatment follows the same protocol — serial casting, Achilles tenotomy (usually on both sides), and boots and bar bracing. The main practical difference is that both feet need attention during casting and bracing, which can be slightly more demanding for parents but follows the same timeline.
In Terms of Genetics
Some researchers have suggested that bilateral involvement may indicate a stronger genetic predisposition to clubfoot. The theory is that when the genetic influence is particularly strong, it's more likely to affect both feet. However, this remains an area of ongoing research, and bilateral clubfoot frequently occurs in families with no previous history of the condition.
In Terms of Relapse
The evidence regarding whether bilateral clubfoot has a higher relapse rate than unilateral is mixed. Some studies report slightly higher relapse rates in bilateral cases, while others find no significant difference. The most important factor in preventing relapse — regardless of whether one or both feet are affected — is strict compliance with the boots and bar protocol.
Prenatal Detection of Bilateral Clubfoot
Bilateral clubfoot may be easier to detect on the 20-week anomaly ultrasound than unilateral clubfoot, simply because both feet showing an abnormal position makes the finding more obvious to the sonographer. However, detection rates still vary considerably between centres.
If bilateral clubfoot is suspected prenatally, additional investigations may be recommended to rule out associated conditions. While the majority of bilateral cases are isolated (idiopathic), having both feet affected slightly increases the likelihood of an associated syndrome, and a detailed anomaly scan or referral to a fetal medicine specialist may be offered. This is a precautionary measure and does not mean that something else is wrong — most bilateral clubfoot cases are indeed isolated.
Treatment of Bilateral Clubfoot
The Ponseti Method for Both Feet
Treatment follows the standard Ponseti protocol, applied to both feet:
- Serial casting: Both feet are cast simultaneously. Each cast session corrects both feet, and the casts are changed weekly. Typically 5-8 casts are needed, the same as for unilateral clubfoot
- Achilles tenotomy: Usually performed on both heels, either on the same day or in quick succession. The tenotomy procedure takes just a few minutes per foot
- Boots and bar: Both feet are placed in the boots and bar brace, which is actually slightly more straightforward with bilateral clubfoot because both boots are set in the same abduction angle (typically 60-70 degrees each). With unilateral clubfoot, one boot is set at a different angle to the other
Practical Considerations for Parents
Managing bilateral clubfoot treatment presents some additional practical considerations:
- Heavier casts: Both legs being in casts means your baby is heavier to lift and move. This can be tiring, particularly during the early casting weeks
- Clothing: Finding clothes that fit over two casts can be challenging. Many parents find that vests and sleep bags work best, with trousers or leggings cut along the seams
- Car seats: Ensure your car seat can accommodate your baby with bilateral casts. You may need to adjust the harness straps
- Bathing: With bilateral casts, sponge baths are the only option. The casts must stay completely dry
- Boots and bar: The standard bar connects both boots, so the bracing setup is actually very similar to unilateral treatment
Bilateral Clubfoot and Associated Conditions
While the majority of bilateral clubfoot cases are isolated (the child is otherwise completely healthy), bilateral involvement has a slightly higher association with other conditions compared to unilateral clubfoot. The overall figures are:
- Idiopathic bilateral clubfoot: Approximately 75-80% of bilateral cases (no other conditions present)
- Bilateral clubfoot with associated conditions: Approximately 20-25% of bilateral cases
Conditions that may be associated with bilateral clubfoot include:
- Arthrogryposis: A condition affecting joint movement
- Neural tube defects: Including spina bifida
- Certain genetic syndromes: Such as Edward syndrome (trisomy 18) or distal arthrogryposis
- Congenital myotonic dystrophy: A muscle condition
If your baby has bilateral clubfoot and no other conditions have been identified, there is generally no reason for additional concern. Your paediatrician will have assessed your baby thoroughly at birth and would have flagged any concerns. Read more in our guide: clubfoot-associated conditions.
Long-Term Outcomes for Bilateral Clubfoot
The long-term outcomes for children with treated bilateral clubfoot are excellent. Key points include:
- Walking: Children with bilateral clubfoot walk at the same age as other children and develop normal walking patterns
- Sports: Children can participate fully in sports and physical activities
- Pain: With proper treatment, there should be no ongoing pain in childhood
- Appearance: Both feet typically appear normal or very close to normal after treatment
- Function: Full foot function is expected in the vast majority of cases
In adulthood, some individuals with bilateral clubfoot may experience mild stiffness or reduced ankle range of motion compared to people without clubfoot, but this is usually not functionally significant. Read more about long-term outcomes in adults.
Emotional Impact of a Bilateral Diagnosis
Hearing that both of your baby's feet are affected can be emotionally overwhelming. Parents often describe bilateral clubfoot as feeling "twice as bad" as unilateral. It's important to acknowledge these feelings while also recognising that:
- Treatment is just as effective. The Ponseti method works brilliantly for bilateral clubfoot
- The treatment timeline is the same. You won't be in treatment twice as long — both feet are treated simultaneously
- Your child won't know any different. Many parents of children with bilateral clubfoot note that their children never notice or care that both feet were affected — it's simply their normal
- Symmetry can be an advantage. Some parents and clinicians note that bilateral involvement means both feet look and function the same, whereas with unilateral clubfoot there may be a subtle size difference between the treated and untreated foot
The parent's experience through clubfoot treatment is challenging regardless of whether one or both feet are affected. Connecting with other families — particularly those who have been through bilateral treatment — can be immensely reassuring.
Frequently Asked Questions
Q: How common is bilateral clubfoot compared to unilateral?
A: Bilateral clubfoot (both feet affected) accounts for approximately 40-50% of all clubfoot cases, with unilateral (one foot) making up the remaining 50-60%. In the UK, this means around 280-350 babies per year are born with bilateral clubfoot. It is a very common presentation that every NHS clubfoot team manages regularly.
Q: What does bilateral clubfoot mean for my baby?
A: Bilateral clubfoot means that both of your baby's feet are affected by the clubfoot deformity. The good news is that treatment is the same as for one foot — the Ponseti method — and it's applied to both feet simultaneously. Outcomes are equally excellent, and most children go on to walk, run, and play completely normally. Read our detailed guide on what bilateral clubfoot means for more information.
Q: Is bilateral clubfoot genetic?
A: All clubfoot has a genetic component, and some researchers believe that bilateral involvement may indicate a stronger genetic influence. However, bilateral clubfoot frequently occurs in families with no previous history of the condition. If you have a family history of clubfoot, the risk of recurrence is higher — see our article on clubfoot genetics for specific figures.
Q: Does bilateral clubfoot take longer to treat?
A: No, the treatment timeline for bilateral clubfoot is the same as for unilateral. Both feet are cast simultaneously during the Ponseti process, the tenotomy is performed on both heels (usually on the same day), and the boots and bar brace accommodates both feet. The overall treatment duration — from first cast to the end of bracing — is the same regardless of whether one or both feet are affected.
Q: Is bilateral clubfoot more likely to relapse?
A: The evidence is mixed. Some studies suggest a marginally higher relapse rate in bilateral cases, while others show no significant difference. The single most important factor in preventing relapse — whether unilateral or bilateral — is strict compliance with the boots and bar bracing protocol. Consistent bracing dramatically reduces relapse risk in all cases.
Q: Can bilateral clubfoot be detected before birth?
A: Bilateral clubfoot can sometimes be detected on the 20-week anomaly scan. Because both feet show an abnormal position, it may actually be slightly easier to spot than unilateral clubfoot. However, prenatal detection rates vary between centres, and not all cases are identified before birth. If bilateral clubfoot is suspected prenatally, a detailed scan may be recommended to check for any associated conditions.