Pes planus (flat feet) describes the loss or reduction of the medial longitudinal arch of the foot, causing the arch to contact the ground rather than staying elevated. Flat feet can be flexible (arch present on tiptoe but collapses on weight-bearing) or rigid (arch absent even when non-weight-bearing). While mild flat feet are common and asymptomatic, symptomatic pes planus -- particularly tibialis posterior tendinopathy and progressive collapsing foot deformity (PCFD) -- produces significant walking pain and functional limitation.
How Flat Feet Affect Walking
- Medial arch collapse causes overpronation (inward roll) of the foot during stance
- Altered force distribution across the foot increases load on the medial structures (plantar fascia, tibialis posterior tendon)
- Tibialis posterior tendinopathy: the tendon that supports the arch fatigues and tears, producing medial ankle and arch pain with walking, particularly prolonged walking
- Altered ankle and knee alignment from chronic pronation -- may contribute to medial knee OA and hip pain
- Fatigue: maintaining pronated gait over long distances is energy-expensive
Walking Cane for Symptomatic Flat Feet
A walking cane provides modest but meaningful benefit for moderate-severe symptomatic pes planus:
- Reduces total foot load (reduces medial arch collapse per step)
- Allows a shorter, less pronated step
- Reduces the fatigue burden of the energy-expensive compensatory gait
However, the primary treatment for symptomatic flat feet is orthotics (custom arch supports that physically restore the arch position) and tibialis posterior strengthening. A cane is an adjunct for pain management and distance management while the primary treatments take effect.
Tibialis Posterior Tendinopathy and Stage
| Stage (Johnson and Strom) | Flat Foot Status | Walking Aid |
|---|---|---|
| Stage 1 (tendinopathy; arch preserved) | Medial pain; arch maintained | Cane optional; orthotics and physio primary |
| Stage 2 (partial tear; flexible deformity) | Arch collapses; single-heel-rise test fails | Cane for distance; brace or orthotic; physio |
| Stage 3 (fixed deformity; rigid flat foot) | Cannot correct; midfoot and hindfoot pain | Cane for all walking; surgical assessment |
| Stage 4 (ankle valgus) | Ankle tilts in addition to arch collapse | Cane essential; ankle brace; surgical priority |
Explore DaiWalk walking canes. Related: Walking Cane for Plantar Fasciitis.
