Pes cavus (high-arched foot) is the opposite of pes planus -- an excessively elevated medial longitudinal arch. Where flat feet overload the medial structures, high-arched feet concentrate load on the heel and metatarsal heads, produce rigid foot mechanics with poor shock absorption, and are commonly associated with lateral ankle instability and neurological conditions (CMT disease is the most common neurological cause of pes cavus).
How Pes Cavus Affects Walking
- Reduced foot flexibility: the rigid cavus foot cannot adapt to terrain; load concentration at heel and metatarsal heads
- Metatarsalgia: pain under the metatarsal heads from pressure concentration
- Claw toes: the associated plantar muscle imbalance pulls toes into flexion, causing toe tip and dorsal toe corns
- Lateral ankle instability: the cavus foot has a varus heel (heel tilts inward) that predisposes to inversion ankle sprains
- Shock transmission: the rigid foot transmits more vibration to the knee and hip than a normal flexible foot
Neurological Pes Cavus: CMT and Hereditary Spastic Paraplegia
Pes cavus associated with neurological conditions (CMT, HSP, Friedreich ataxia) is often accompanied by muscle weakness, proprioceptive loss, and gait ataxia that independently indicate cane use. See the dedicated CMT and HSP articles for more detail.
Walking Cane for Idiopathic or Structural Pes Cavus
For structural pes cavus without an underlying neurological condition:
- Cane reduces total foot load, which decreases pressure at the painful metatarsal heads and heel
- Cane compensates for lateral ankle instability (the cavus foot predisposed to inversion ankle sprains)
- Cane provides shock absorption reference -- the cane tip absorbs some of the hard heel strike load that would otherwise travel up the leg
Pes Cavus Type and Walking Aid
| Pes Cavus Type | Primary Walking Problem | Walking Aid |
|---|---|---|
| Mild structural pes cavus | Metatarsalgia; minor lateral instability | Cane optional; orthotics with metatarsal dome pad primary |
| Moderate pes cavus | Significant metatarsalgia; recurrent ankle sprains | Cane for outdoor and terrain; ankle brace; lateral heel wedge |
| Severe pes cavus with claw toes | Multi-level foot pain; very limited walking | Cane for daily walking; surgical assessment |
| Neurological pes cavus (CMT/HSP) | Muscle weakness + pes cavus + ataxia | Cane as for primary neurological condition; see CMT/HSP articles |
Explore DaiWalk walking canes. Related: Walking Cane for CMT (Neurological Pes Cavus).
