Lateral Ankle Instability

Model P3

Stabilizes the ankle joint and prevents rolls and sprains. Provides lateral support to improve balance and foot and ankle stability.



  • Lateral flange
  • Medial flange
  • Reverse oblique rearfoot valgus post
  • Premium, Medical Grade, Polypropylene Shell


The Lateral Ankle Instability device is a rigid, custom-molded orthotic that can help improve the function and neuromuscular control of the ankle by increasing balance, providing lateral support, and improving sensory feedback.

This device is ideal for patients with chronic ankle sprains,instability, peroneal tendon pathology, lateral ligament laxity, or as a treatment prior to Brostrom surgery. It features a lateral oblique rearfoot post that provides rearfoot control superior to that of standard rearfoot posts, a polypropylene shell with lateral and medial flanges for control throughout gait, a vinyl top cover, and a suede bottom cover.

This pathology device is designed to fit in most shoes with removable sock liners or insoles.

The Lateral Ankle Instability is constructed with a positive model of the patient’s foot and can be modified at the practitioner’s discretion.

Tech Specs


  • 3mm Fat Pad Expansion
  • 3mm Lower Medial Arch
  • 16mm Heel Cup
  • Lateral Flange
  • Medial Flange


  • MOD: 0 (Modify casts to Balance Forefoot perpendicular to Rearfoot)
  • RF: 2G (2° Valgus Extrinsic Rearfoot Post)
  • FF1: N (Forefoot Neutral: Not Posted)
  • FF2:      (None: Splitting forefoot post partial intrinsic and partial extrinsic)
  • HL: 0 (No Heel Lift)


  • 3mm White Polypropylene Shell
  • White Crepe Lateral Oblique Rearfoot Post


  • Finish Standard
  • White Heel Plate


  • 1.5mm Myolite Extension to Toes
  • Black Vinyl Top Cover to Toes
  • Black Suede Bottom Cover to Toes


Top Cover Options

  • Glove Leather
  • Micro Suede
  • Plastazote
  • Spenco
  • Vinyl
  • Prolite

Bottom Cover Options

  • Glove Leather
  • Micro Suede
  • Vinyl

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Recommended For

  • Lateral ligament laxity
  • Peroneal tendon pathology
  • Chronic ankle instability

Clinical Indications

  • Peroneal tendinitis
  • Peroneal tendinosis
  • Talofibular ligament ruptures/sprains
  • Peroneal tendon subluxation

Customized Devices

Full details and images from custom devices that have been built for actual patients

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