Charcot-Marie-Tooth disease (CMT) is the most common inherited neuromuscular disorder, affecting approximately 1 in 2,500 people. It is a hereditary peripheral neuropathy causing progressive degeneration of motor and sensory peripheral nerves, with a characteristic distribution: the longest nerves are affected first, meaning symptoms begin in the feet and lower legs before affecting the hands. CMT is a lifelong condition with enormous variability in severity -- some patients walk normally into old age; others require mobility aids in their 20s.
How CMT Affects Gait
CMT causes a predictable pattern of lower limb involvement:
- Peroneal (fibular) nerve involvement: Weakness of the peroneal muscles causes foot drop -- difficulty lifting the forefoot during the swing phase of gait. The characteristic high-stepping gait (steppage gait) compensates by exaggerating hip and knee flexion to clear the foot from the ground
- Intrinsic foot muscle weakness: Atrophy of intrinsic foot muscles produces the classic CMT foot deformity: high arch (pes cavus) and hammer toes. These deformities alter foot contact mechanics and increase ankle instability
- Ankle instability: Weakness of ankle invertors and evertors (peroneus longus/brevis) reduces active ankle stability during stance. Ankle sprains are common and can be severe
- Sensory loss: Proprioceptive impairment from sensory nerve degeneration removes the normal sensory feedback from the foot and ankle -- compounding the motor instability with a sensory balance deficit
Role of a Walking Cane in CMT
For mild-moderate CMT: A walking cane addresses two simultaneous deficits: proprioceptive substitution (ground contact through the shaft compensates for impaired sensory feedback from the foot) and stability support (provides a third contact point when ankle instability creates balance perturbations).
For foot drop: A cane alone is insufficient for foot drop -- ankle foot orthoses (AFOs) are the primary treatment for foot drop. However, a cane used alongside an AFO provides additional stability that the AFO alone does not provide.
For pes cavus instability: The high arch foot in CMT has a reduced contact area with the ground and a tendency toward inversion (rolling inward). A cane provides a compensatory lateral stability mechanism.
CMT Severity and Aid Selection
| CMT Severity | Primary Gait Problem | Appropriate Aid |
|---|---|---|
| Mild (CMT1A, limited foot weakness) | Mild ankle instability, subtle pes cavus | Single cane, supportive footwear |
| Moderate (foot drop onset) | Steppage gait, ankle instability | AFO + single cane |
| Moderate-severe (bilateral involvement) | Bilateral foot drop, significant instability | Bilateral AFOs + cane or bilateral canes |
| Severe (hand weakness also present) | Proximal involvement, balance severely impaired | Forearm crutches or rollator |
Hand Involvement in CMT
In moderate-severe CMT, hand weakness eventually develops (the condition is length-dependent but the hands are not as severely affected as feet in most cases). Hand weakness affects grip force, which reduces cane effectiveness. The Anatomic Grip distributes load across the palm, requiring less active grip force than a narrow round handle -- this is relevant once hand involvement becomes symptomatic.
View the full DaiWalk cane range. Related reading: Walking Cane for Foot Drop | Walking Cane for Peripheral Neuropathy
