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PubMed This is a summary of 23 peer-reviewed journal articles Updated
Pediatric Neurology · Charcot-Marie-Tooth disease

Is My Child's Clubfoot Actually Charcot-Marie-Tooth?

At a Glance

While idiopathic clubfoot is an isolated issue that responds well to casting, clubfoot that resists treatment or rapidly relapses may be the first sign of Charcot-Marie-Tooth (CMT) disease. Children with treatment-resistant clubfoot should be evaluated by a pediatric neurologist.

In this answer

3 sections

01

The Difference Between Idiopathic Clubfoot and CMT Deformities

02

Red Flags That Clubfoot Might Be CMT

03

When to Seek a Neurologist and Genetic Testing

If your child was recently diagnosed with “idiopathic clubfoot,” it is entirely possible that they have an isolated, non-progressive structural issue. However, in some cases, what appears to be simple clubfoot is actually the first sign of an underlying neuromuscular condition like Charcot-Marie-Tooth (CMT) disease [1][2]. While typical clubfoot is stable once corrected, CMT is a progressive condition, meaning early diagnosis is essential for building the right support team for your child’s development [3][4]. If your child’s clubfoot does not respond well to standard casting, or if they have a family history of neuropathy, high arches, or clumsiness, a pediatric neurology consult and genetic testing for CMT are strongly warranted [5][6].

The Difference Between Idiopathic Clubfoot and CMT Deformities

Idiopathic clubfoot (also called congenital talipes equinovarus) is a common structural condition present at birth where a baby’s foot is twisted inward and downward. “Idiopathic” means the condition occurs on its own without a known underlying medical cause [7][8].

CMT, on the other hand, is a progressive hereditary nerve disorder [3]. The nerve damage in CMT leads to muscle weakness, particularly in the lower legs and feet [9][10]. This muscle imbalance can pull the foot bones out of alignment, creating severe deformities that mimic clubfoot or present as pes cavus (very high arches) [1][2]. Early-onset forms of CMT can cause foot deformities that are present at birth (mimicking congenital clubfoot), or they can develop slightly later in infancy and mimic a relapsing clubfoot [1][11].

Red Flags That Clubfoot Might Be CMT

While true idiopathic clubfoot responds very well to standard orthopedic treatments, CMT-driven foot deformities behave differently. The following “red flags” suggest the clubfoot may be secondary to a neuromuscular condition like CMT:

  • Resistance to standard casting: The Ponseti method (a series of gentle stretches and casts to slowly reposition the foot) is the gold standard for treating clubfoot [6][8]. If a child’s foot is unusually stiff, fails to correct with Ponseti casting, or rapidly relapses despite wearing the required braces, it strongly points to an underlying nerve or muscle issue rather than idiopathic clubfoot [5][12].
  • Progressive weakness and clumsiness: Because CMT damages the nerves connecting to the muscles, affected children often develop progressive distal weakness (weakness at the furthest parts of the limbs) [9][13]. This may look like “foot drop” (difficulty lifting the front part of the foot), frequent tripping, or delayed motor milestones.
  • Missing reflexes: During a physical exam, a doctor may find that the child has reduced or absent deep tendon reflexes (such as the knee-jerk or ankle-jerk reflexes), which are hallmark signs of CMT [1][14].
  • Family history: CMT is inherited. A family history of high arches, hammertoes, leg weakness, or undiagnosed “clumsy gait” in parents or grandparents greatly increases the likelihood that a child’s clubfoot is CMT-related [15]. If you are unsure of your family history, taking a close look at your own feet or reflecting on whether you were considered “clumsy” as a child can sometimes provide the missing puzzle piece.

When to Seek a Neurologist and Genetic Testing

If a child exhibits any of the red flags above alongside their clubfoot diagnosis, it is time to look beyond standard orthopedic care. An evaluation by a pediatric neurologist is the crucial next step [5][7].

To investigate a potential CMT diagnosis, the neurologist may recommend:

  • Genetic Testing: If clinical signs point to a neuropathy, comprehensive genetic testing (often using a blood or saliva sample) can look for specific CMT-causing gene mutations [15][16]. A positive result confirms the subtype, helping map out how the condition might progress [17]. However, because not all CMT-causing genes have been identified, a negative test does not entirely rule out the disease if clinical signs are strong [18][17].
  • Electromyography (EMG) and Nerve Conduction Studies: These tests measure how fast and how well electrical signals travel through the nerves, distinguishing between nerve-driven issues like CMT and isolated orthopedic conditions [19][20]. It is important for parents to know that an EMG involves small electrical pulses and tiny needles, which can be distressing for babies and young children. Because of this discomfort, you can ask your neurologist about the possibility of running non-invasive genetic panels first [15].

Ensuring the correct diagnosis protects the child from undergoing orthopedic surgeries that may not provide long-term success if the underlying progressive nerve damage is not addressed [6][21]. Early confirmation of CMT allows families to build a specialized care team—involving neurologists, orthopedists, and physical therapists—to proactively manage the child’s mobility and protect their joints [22][23].

Common questions in this guide

What is the difference between idiopathic clubfoot and CMT?
Idiopathic clubfoot occurs on its own as a structural issue without a known underlying medical cause. CMT is a progressive inherited nerve disorder that causes muscle weakness, which can pull the foot out of alignment and create deformities that mimic clubfoot.
Why might standard clubfoot casting fail if a child has CMT?
The standard treatment for clubfoot, known as the Ponseti method, relies on gently stretching the foot into place. If a child has underlying nerve and muscle damage from CMT, their foot may be unusually stiff, fail to correct with casting, or rapidly relapse.
What are the signs that my child's clubfoot might be a nerve disorder?
Red flags include clubfoot that resists standard casting or bracing, missing knee-jerk or ankle reflexes, and progressive weakness like foot drop. A family history of high arches, hammertoes, or clumsy gait is also a strong indicator.
Should we start with genetic testing or an EMG to diagnose CMT in an infant?
Many pediatric neurologists recommend starting with comprehensive genetic testing using a blood or saliva sample, as it is non-invasive. While an EMG is very accurate, it involves needles and electrical pulses that can be highly distressing for babies and young children.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Given my child's response to casting, do you have experience distinguishing between isolated idiopathic clubfoot and clubfoot driven by a neuromuscular issue like CMT?
  2. 2.If my child's clubfoot relapses despite our strict compliance with bracing, what is the protocol for investigating an underlying neurological cause?
  3. 3.Can we start with a comprehensive genetic panel to look for hereditary neuropathies before proceeding to more invasive tests like an EMG?
  4. 4.If the genetic testing comes back negative but my child still shows signs like missing reflexes or stiff feet, how will we confirm or rule out a clinical CMT diagnosis?

Questions For You

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Related questions

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References

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This page is for informational purposes only and does not replace professional medical advice. Always consult a pediatric neurologist or orthopedist regarding your child's specific diagnosis and treatment plan.

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