Charcot-Marie-Tooth disease (CMT) is the most common inherited peripheral neuropathy, affecting approximately 1 in 2,500 people. It is caused by mutations in genes involved in peripheral nerve myelin (CMT1, most common) or axon (CMT2) function. The result is progressive distal peripheral neuropathy causing a characteristic pattern of muscle wasting and weakness, sensory loss, and foot deformity.
CMT Walking Features: The Classic Pattern
CMT produces a recognisable constellation of walking impairments:
- Foot drop: Weakness of the tibialis anterior and peroneal muscles causes foot drop -- the foot cannot be raised during the swing phase of gait. This produces a characteristic steppage gait and markedly increases the risk of tripping
- Pes cavus (high-arched foot): Imbalance between intrinsic and extrinsic foot muscles produces a high-arched, claw-toed foot deformity. The rigid pes cavus reduces shock absorption and produces a smaller weight-bearing contact area, concentrating load under the metatarsal heads and heel
- Ankle instability: Peroneal weakness reduces lateral ankle stability. Inversion sprains are very common in CMT
- Distal lower limb muscle atrophy: Progressive loss of muscle bulk below the knee (the inverted champagne-bottle appearance) reduces calf push-off power
- Sensory loss: Distal sensory loss impairs foot proprioception, further compromising balance and ground surface detection
AFO and Cane: The CMT Combination
In CMT, an ankle-foot orthosis (AFO) addresses the foot drop and ankle instability mechanically, while a cane addresses balance, fatigue, and proximal stability. These are complementary rather than alternatives:
- An AFO controls the ankle in a functional position (90 degrees), eliminating the steppage gait and foot drag. It does not address balance or proximal stability
- A cane provides the balance supplementation that the sensory loss and proximal weakness create. Many CMT patients use both an AFO and a cane simultaneously
Cane Selection Considerations in CMT
CMT sensory loss in the hands may affect grip sensation -- the person may not feel the cane handle reliably. A handle with a textured or defined surface provides proprioceptive input where sensory loss is partial. The DaiWalk Anatomic Grip ergonomic profile provides a shaped contact surface that guides correct hand positioning even with reduced sensory feedback.
CMT Features and Mobility Aid Strategy
| CMT Feature | Primary Aid | Cane Role |
|---|---|---|
| Foot drop | AFO (controls ankle, eliminates steppage) | Cane as adjunct for balance; not substitute for AFO |
| Ankle instability (peroneal weakness) | AFO or lateral ankle support | Cane provides lateral stability during walking |
| Sensory loss (foot and hand) | Visual compensation strategies | Cane provides additional ground contact input |
| Pes cavus (rigid high arch) | Orthotics for pressure redistribution | Cane reduces metatarsal head loading |
| Progressive proximal weakness (later stages) | Two canes or forearm crutches | Bilateral aids as disease progresses |
Related: Walking Cane for Foot Drop and AFO | Walking Cane for Peripheral Neuropathy. Explore DaiWalk walking canes.
