Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
Hereditary spastic paraplegia causes a progressive spastic gait with pes cavus and foot drop — and the specific foot deformity pattern that develops over time determines whether bracing, tendon surgery, or osteotomy offers the best quality-of-life improvement. Call (810) 206-1402 — expert podiatric care across Michigan.
Hereditary spastic paraplegia (HSP) is a group of inherited neurodegenerative disorders characterized by progressive lower extremity spasticity and weakness from corticospinal tract degeneration. Foot deformities develop in the majority of patients with HSP due to the combination of spastic equinus, muscle imbalance, and progressive weakness — making podiatric management an essential component of long-term functional preservation.
Common Foot Deformities in HSP
| Deformity | Mechanism | Functional Impact | Podiatric Management |
|---|---|---|---|
| Equinus (toe walking) | Spastic gastrocnemius-soleus; ankle plantarflexion contracture | Altered gait; toe-walking; increased fall risk | AFO; serial casting; Botox injection; gastrocnemius lengthening |
| Cavus foot (high arch) | Intrinsic/extrinsic muscle imbalance; peroneus longus overactivity | Lateral instability; metatarsal overload; heel pain | Lateral wedge orthotic; custom insole; surgical correction if severe |
| Varus hindfoot | Tibialis posterior overactivity with weak peroneal muscles | Lateral ankle instability; difficult shoe fitting | AFO with lateral flange; tibialis posterior lengthening or transfer |
| Claw toes | Intrinsic weakness with extrinsic extensor overactivity | Dorsal PIP corns; metatarsalgia; shoe fitting difficulty | Toe pad; wider box; flexor-to-extensor transfer; arthroplasty |
| Scissor gait | Hip adductor spasticity affecting foot strike pattern | Narrow base of support; increased fall risk | Orthotics to stabilize foot strike; coordination with neurology/PT |
Orthotic and Surgical Decision Framework
| Intervention | Indication | Goal | Considerations |
|---|---|---|---|
| Ankle-foot orthosis (AFO) | Equinus preventing heel strike; foot drop; varus instability | Restore plantigrade foot contact; reduce falls | Carbon fiber AFO for mild equinus; solid AFO for severe; must accommodate spasticity |
| Botulinum toxin (Botox) | Dynamic spastic equinus before contracture is fixed | Temporary spasticity reduction; window for stretching/AFO fitting | Wears off in 3-6 months; requires repeat; best before contracture is fixed |
| Gastrocnemius lengthening | Fixed equinus contracture; failed AFO management | Permanent reduction in plantarflexion contracture | Coordinate with neurology; spasticity management must continue post-op |
| Tendon transfer | Varus foot with functional tibialis posterior but weak peroneals | Rebalance inversion/eversion forces | Requires intact motor units for meaningful benefit |
At Balance Foot & Ankle in Howell and Bloomfield Hills, HSP foot deformities are managed in coordination with the patient’s neurologist to time interventions appropriately as the disease progresses. Call (810) 206-1402 for evaluation.
PubMed: Hereditary Spastic Paraplegia Foot Deformity
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Doctor Answer
How does hereditary spastic paraplegia affect the feet?
Hereditary spastic paraplegia (HSP) causes progressive lower limb spasticity that leads to equinovarus foot deformity, toe walking, and impaired balance. Foot management focuses on maintaining mobility and preventing contractures through physical therapy, ankle-foot orthoses (AFOs), serial casting, and in some cases surgical tendon lengthening or correction. Early intervention helps preserve walking function longer.
Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.