Eqinus gait
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Equinus Gait
Definition
Equinus gait (also called toe-walking gait or foot drop in different contexts) is a pathological gait pattern in which the ankle remains in plantarflexion during the stance phase, preventing normal heel-strike. The foot is held in a "horse hoof" (equinus = horse in Latin) position - toes pointing downward.
Classification / Types
Equinus gait can be categorized by mechanism:
| Type | Mechanism | Example Cause |
|---|---|---|
| Spastic/Dynamic | Overactive gastrocnemius-soleus (spasticity) | Cerebral palsy, stroke, TBI |
| Fixed/Structural | Contracture of Achilles tendon | Untreated spasticity, immobilization |
| Neurogenic (flaccid) | Weak/absent dorsiflexors (foot drop) | Peroneal nerve palsy, CMT, polio |
| Idiopathic | No identifiable neurologic cause | Habitual toe-walking in children |
Common Causes
Neurological (upper motor neuron):
- Cerebral palsy (CP) - most common cause in children; equinus is the most common foot deformity in CP, affecting ~70% of children. Spasticity of the gastrocnemius-soleus complex is the underlying driver. It worsens during growth spurts because the tibia outgrows the muscle-tendon unit.
- Stroke / Acquired Brain Injury - dynamic ankle equinus is a major gait deviation. The goal is ankle stability at neutral during initial contact (IC) and floor clearance during swing.
- Traumatic brain injury (TBI)
Neurological (lower motor neuron / peripheral):
- Peroneal nerve palsy (foot drop - inability to dorsiflex)
- Charcot-Marie-Tooth disease (progressive equinus + cavus deformity)
- Poliomyelitis
Other:
- Idiopathic toe-walking (children, often bilateral)
- Post-immobilization contracture
Gait Pattern Analysis
In normal gait, the heel strikes first (initial contact), followed by foot-flat, then push-off at toe-off. In equinus gait:
- Swing phase: reduced ankle dorsiflexion - the toes may drag (foot drop) OR the patient compensates with hip/knee hiking (steppage gait)
- Initial contact: toe or forefoot strikes first instead of heel
- Stance phase: the heel may never contact the ground (persistent toe-walking)
Associated gait patterns in CP:
- Toe-walking (equinus): contracted heel cords; treated with AFO if passively correctable or surgery (gastrocnemius recession vs. Achilles tendon lengthening - ATL)
- Crouched gait: hamstring contracture producing hip flexion + knee flexion + ankle equinus; requires multilevel lengthening; isolated heel cord lengthening worsens crouch
- Stiff-knee gait: rectus femoris firing out of phase in spastic diplegia; treated with distal rectus transfer to hamstrings
- Scissoring gait: hip adductor spasticity; treated with adductor release
Diagnosis
- Clinical examination: passive ankle dorsiflexion with knee extended vs. flexed (Silfverskiold test) - distinguishes isolated gastrocnemius tightness from combined gastrocnemius-soleus tightness
- Observational gait analysis: video-based assessment
- 3D computerized gait analysis with dynamic EMG and force-plate studies: the gold standard for preoperative planning in CP
- Surgery is typically indicated when ankle dorsiflexion cannot reach neutral (kinematics change dramatically with <5° of maximal dorsiflexion)
Treatment
Non-operative
| Modality | Role |
|---|---|
| Ankle-foot orthosis (AFO) | First-line; positions joints in proper plane, reduces spasticity reflex, decreases energy expenditure |
| Posterior leaf-spring orthosis | Specifically for excessive plantar flexion during swing phase |
| Stretching / physiotherapy | Maintains range of motion |
| Botulinum toxin A (BTX-A) | Reduces spasticity, delays surgery; effective in preventing equinus deformity in CP |
| Serial casting | Stretches contracture progressively |
| Night bracing | Prevents foot from assuming equinus position during sleep |
For acquired brain injury (stroke/TBI): adjustable AFO with dorsiflexion and plantar-flexion stop at neutral is used during recovery, followed by rigid AFO at plateau.
Operative
| Procedure | Indication |
|---|---|
| Gastrocnemius recession (Strayer/Vulpius) | Isolated gastrocnemius tightness (Silfverskiold positive); lower recurrence risk |
| Achilles tendon lengthening (ATL / TAL) | Combined gastrocnemius-soleus contracture |
| Percutaneous ATL | Dynamic equinus in acquired brain injury; overcomes orthosis holding power |
| Multilevel surgery | Crouched gait with equinus as component - correct hip, knee, and ankle simultaneously |
Important surgical considerations:
- Surgery generally performed at age 4-5 years in CP
- Recurrence rate ranges 0-50% (study of 243 children: 11% at 10 years; higher in those <4 years)
- Younger patients and hemiplegics most likely to recur
- For dynamic varus component (out-of-phase tibialis anterior in stance): split or complete lateral transfer of tibialis anterior
Key Points to Remember
- Equinus is the most common foot deformity in cerebral palsy (~70% of children)
- Gastrocnemius-soleus spasticity is the driving force; worsens during rapid growth (tibial overgrowth)
- Surgery indicated when ankle cannot reach neutral in an ambulatory child (<5° dorsiflexion)
- AFO + BTX-A are first-line; delay or prevent surgery
- Never do isolated ATL in crouched gait - it worsens the crouch
- Gait analysis with dynamic EMG is essential before multilevel surgery in CP
- Recurrence is higher in younger patients (especially <3 years) and hemiplegics
Sources: Miller's Review of Orthopaedics 9th Ed, p. 302 (Gait Disorders in CP); Campbell's Operative Orthopaedics 15th Ed 2026 (Equinus Deformity, Surgical Correction of Equinus Deformity, Lower Limb - Acquired Brain Injury)
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