ROOT MODEL: P3
Lateral Ankle Instability
Precision-engineered to restore neuromuscular control, provide lateral support, and stabilize the ankle — custom congruent to every patient.
BIOMECHANICS
Designed to stabilize the ankle.
A lateral oblique rearfoot post — superior to standard posts — controls the hindfoot while dual medial and lateral flanges maintain stability throughout gait. Fabricated from a positive model of the patient's foot, the P3 improves balance, enhances sensory feedback, and reduces the mechanical vulnerability that leads to chronic instability.
FRAME MATERIAL
Polypropylene
Rigidity is selected per patient weight — so the shell provides exactly the lateral control that specific patient's ankle instability requires.
REARFOOT POST
55–65 Shore A Oblique EVA
The lateral oblique angle is built into the positive model of the patient's foot — providing rearfoot control superior to a standard post, congruent to their anatomy.
HEEL CUP DEPTH
18mm
Cast directly from the patient's calcaneus, the deep cup fits their heel precisely — controlling their specific degree of inversion and eversion, not an average.
TOP COVER
.75mm Protex
Trimmed to the patient's toe line, so contact and pressure distribution match their exact foot geometry.
BOTTOM COVER
.6mm Suede
Selected for shoe compatibility — keeps the device stable inside the shoe while the custom shell delivers lateral control above.
EXTENSION
1.5mm Myolite
Full-length cushioning that absorbs impact without compromising the lateral stability the device is designed to deliver.
PRODUCT DETAILS
The full picture.
Everything you need to prescribe.
PURPOSE
Clinical Indications
- Peroneal tendinitis
- Peroneal tendinosis
- Talofibular ligament ruptures/sprains
- Peroneal tendon subluxation
- Lateral ligament laxity
- Peroneal tendon pathology
- Chronic ankle instability
- Pre-surgical treatment prior to Brostrom procedure
DESIGN
Device Overview
Designed to improve function and neuromuscular control of the ankle — this device increases balance, provides lateral support, and enhances sensory feedback for patients with chronic instability.
A lateral oblique rearfoot post delivers rearfoot control superior to standard posts. Dual medial and lateral flanges maintain control throughout gait. Fabricated from a positive model of the patient's foot, fully modifiable at the practitioner's discretion.
DETAILS
Suggested L-codes
- L3000 (UCB)
- L3010 (longitudinal/metatarsal support)
- L3020 (arch support)
- L5000 (filler)
Final coding and billing are the provider’s responsibility
Delivery Time
- Standard: 2 weeks
- Expedited: Available upon request
MEDICAL CONDITION
Lateral Ankle Instability
The lateral ligament complex is the primary restraint against inversion of the ankle — protecting the joint through every step, change of direction, and landing. When these ligaments are repeatedly sprained or chronically lax, the ankle loses its mechanical and neuromuscular stability, creating a cycle of re-injury that worsens with each episode.
A Condition That Compounds Without Intervention
Lateral ankle instability develops when acute sprains fail to heal fully, or when ligament laxity allows the joint to move beyond its normal range. Each subsequent sprain further compromises proprioceptive function — the ankle's ability to sense and respond to position. Without intervention, the condition progresses from mechanical instability to chronic neuromuscular dysfunction.
Read more...
Peroneal Tendinitis — Inflammation of the peroneal tendons from overuse or repetitive inversion stress. Presents as lateral ankle pain and swelling, worsening with activity.
Peroneal Tendinosis — Chronic degeneration of the peroneal tendon from sustained overuse. No acute inflammation — the tendon is deteriorating, not just irritated. Presents as persistent lateral pain and weakness.
Talofibular Ligament Sprain/Rupture — Disruption of the anterior talofibular or calcaneofibular ligaments — the most commonly injured structures in ankle sprains. Grades I–III determine the degree of laxity and required intervention.
Peroneal Tendon Subluxation — Displacement of the peroneal tendons from their groove behind the lateral malleolus. Presents as snapping or popping with dorsiflexion, often following acute trauma.
Diagnosis
Clinical assessment includes the anterior drawer and talar tilt tests to evaluate ligament integrity and mechanical laxity. Stress X-rays assess joint stability under load. MRI and ultrasound are used to evaluate peroneal tendon condition and the degree of ligament disruption when conservative treatment planning requires a clearer picture.
Treatment Pathway
First-line treatment includes orthotics, rest, NSAIDs, and neuromuscular rehabilitation. Custom orthotics are most effective when introduced early — restoring mechanical stability while proprioceptive retraining rebuilds neuromuscular control.If little progress is seen at 2–3 months, bracing or immobilization is indicated. Brostrom ligament reconstruction becomes a consideration after 6 months without meaningful recovery.
The P3 is designed to be part of the first-line response — restoring lateral stability from the first step, supporting the ankle while it heals.
RECOMMENDED FOR
The right device
for the right diagnosis.
P3 is indicated for chronic ankle instability, peroneal tendon pathology, and lateral ligament dysfunction. Prescribe with confidence across these conditions.
PROVIDER SUPPORT
Every detail engineered for faster recovery.
Open Medical Account
Create your provider account
Onboarding Resources
Get started with the platform
How to Order
Step-by-step ordering guide
Ordering Resources
Forms, guides, and materials
Turnaround Information
Current production timelines
Library of Modifications
845+ modification options
Schedule Meeting
Book a business meeting
FAQs
Common questions answered
JOIN THE MOVEMENT
Join the KevinRoot Medical Network
Start prescribing with FootID Pro and KevinRoot Medical.
ROOT MODEL: P3
Lateral Ankle Instability
Precision-engineered to restore neuromuscular control, provide lateral support, and stabilize the ankle — custom congruent to every patient.
CONSTRUCTION
Patient-first angle
Built to their spec. Built for their foot.
FRAME MATERIAL
Polypropylene
Rigidity is selected per patient weight — so the shell provides exactly the lateral control that specific patient's ankle instability requires.
REARFOOT POST
55–65 Shore A Oblique EVA
The lateral oblique angle is built into the positive model of the patient's foot — providing rearfoot control superior to a standard post, congruent to their anatomy.
HEEL CUP DEPTH
18mm
Cast directly from the patient's calcaneus, the deep cup fits their heel precisely — controlling their specific degree of inversion and eversion, not an average.
TOP COVER
.75mm Protex
Trimmed to the patient's toe line, so contact and pressure distribution match their exact foot geometry.
BOTTOM COVER
.6mm Suede
Selected for shoe compatibility — keeps the device stable inside the shoe while the custom shell delivers lateral control above.
EXTENSION
1.5mm Myolite
Full-length cushioning that absorbs impact without compromising the lateral stability the device is designed to deliver.
PRODUCT DETAILS
The full picture.
Everything you need to prescribe.
PURPOSE
Clinical Indications
- Posterior Tibial Tendon Dysfunction (PTTD)
- Flexible and reducible adult acquired flatfoot
- Symptomatic overpronation
- Adult acquired flatfoot with arch collapse
- Stage 1 adult acquired flatfoot
- Grade I & II posterior tibial tendon dysfunction
DESIGN
Device Overview
Designed to provide maximum arch support for adult acquired flatfoot — most commonly caused by posterior tibial tendon dysfunction — this device arrests arch collapse and reduces symptomatic pain.
A rigid polypropylene frame and medium medial flange control pronation at the source. A deep heel cup stabilizes the calcaneus, restoring biomechanical control throughout the gait cycle.
DETAILS
Suggested L-codes
- L3000 (UCB)
- L3010 (longitudinal/metatarsal support)
- L3020 (arch support)
- L5000 (filler)
Final coding and billing are the provider’s responsibility
Delivery Time
- Standard: 2 weeks
- Expedited: Available upon request
MEDICAL CONDITION
Lateral Ankle Instability
The lateral ligament complex is the primary restraint against inversion of the ankle — protecting the joint through every step, change of direction, and landing. When these ligaments are repeatedly sprained or chronically lax, the ankle loses its mechanical and neuromuscular stability, creating a cycle of re-injury that worsens with each episode.
Read more...
A Condition That Compounds Without Intervention
Lateral ankle instability develops when acute sprains fail to heal fully, or when ligament laxity allows the joint to move beyond its normal range. Each subsequent sprain further compromises proprioceptive function — the ankle's ability to sense and respond to position. Without intervention, the condition progresses from mechanical instability to chronic neuromuscular dysfunction.
Peroneal Tendinitis — Inflammation of the peroneal tendons from overuse or repetitive inversion stress. Presents as lateral ankle pain and swelling, worsening with activity.
Peroneal Tendinosis — Chronic degeneration of the peroneal tendon from sustained overuse. No acute inflammation — the tendon is deteriorating, not just irritated. Presents as persistent lateral pain and weakness.
Talofibular Ligament Sprain/Rupture — Disruption of the anterior talofibular or calcaneofibular ligaments — the most commonly injured structures in ankle sprains. Grades I–III determine the degree of laxity and required intervention.
Peroneal Tendon Subluxation — Displacement of the peroneal tendons from their groove behind the lateral malleolus. Presents as snapping or popping with dorsiflexion, often following acute trauma.
Diagnosis
Clinical assessment includes the anterior drawer and talar tilt tests to evaluate ligament integrity and mechanical laxity. Stress X-rays assess joint stability under load. MRI and ultrasound are used to evaluate peroneal tendon condition and the degree of ligament disruption when conservative treatment planning requires a clearer picture.
Treatment Pathway
First-line treatment includes orthotics, rest, NSAIDs, and neuromuscular rehabilitation. Custom orthotics are most effective when introduced early — restoring mechanical stability while proprioceptive retraining rebuilds neuromuscular control.If little progress is seen at 2–3 months, bracing or immobilization is indicated. Brostrom ligament reconstruction becomes a consideration after 6 months without meaningful recovery.
The P3 is designed to be part of the first-line response — restoring lateral stability from the first step, supporting the ankle while it heals.
BIOMECHANICS
Designed to stabilize the ankle.
A lateral oblique rearfoot post — superior to standard rearfoot posts — controls the hindfoot while dual medial and lateral flanges maintain stability throughout the entire gait cycle. Fabricated from a positive model of the patient's foot, the P3 improves balance, increases sensory feedback, and reduces the mechanical vulnerability that leads to repeat sprains and chronic instability.
RECOMMENDED FOR
The right device
for the right diagnosis.
P1 is indicated for a range of Achilles and calcaneal pathologies. Prescribe with confidence across these conditions:
PROVIDER SUPPORT
Resources for Providers
KevinRoot Medical helps providers align orthotic selection with presentation, pathology, and performance goals.
Open Account
Create your provider account
Onboarding
Get started with the platform
How to Order
Step-by-step ordering guide
Ordering
Forms, guides, and materials
Turnaround
Current production timelines
Modifications
845+ modification options
Schedule Meeting
Book a business meeting
FAQs
Common questions answered
JOIN THE MOVEMENT
Join the KevinRoot Medical Network
Start prescribing with FootID Pro and KevinRoot Medical.