The Gorilla Lapidus Arthrodesis System design began around the concept of neutralization plating.

A plate developed for the medial wall provides added rigidity because the plate is positioned on its side. Medial wall plates traditionally add a complicating factor in that the distal screws apply adductory force on the 1st metatarsal as they are tightened to the plate.

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Key Features

About Lapidus Arthrodesis System

To combat this, Paragon 28® developed the plates to match the corrected metatarsal position as well as curvature, thus following the principles of a “bent plate technique” to limit the adductory force applied to the metatarsal. In addition, a medial wall plate is better positioned to prevent plantar gapping while avoiding the insertion of the tibialis anterior plantarly. The anatomic plate construct is designed to help reduce soft tissue irritation in an area where ample soft tissue coverage can be a concern in situations with a poorly designed plate construct.

These features were incorporated into all 18 Lapidus Arthrodesis plating options: standard, graft-spanning and medial wall step-off.

A Precision™ Guide Lapidus screw guide is provided in the system to allow for placement of a lag screw across the Lapidus Arthrodesis while missing all other screws in the construct.

Design Rationale

Paragon 28 focused on surgeon concerns with the Lapidus procedure by addressing them with several patent pending features: a medially positioned plate, a ramped plate proximally to avoid tendon irritation, anatomic curvature of the plate to provide a bent plate advantage, a plantar locking arm to better resist the tension side of the joint, and a Precision Guide Lapidus for crossing screw insertion to avoid collision with the locking plate screws.

Specifications

Standard Armless

  • Size: Standard
  • Plate Thickness: 1.3mm
  • Total Plates: 2

Standard

  • Size: Standard
  • Plate Thickness: 1.3mm
  • Total Plates: 2

Medial Wall Step-Off

  • Size: Step off sizes in 1mm increments from 1-5mm
  • Plate Thickness: 1.4mm
  • Total Plates: 10

Graft Spanning

  • Size: Small (5mm Graft), Medium (8mm/10mm Graft), Large (12mm/14mm Graft)
  • Plate Thickness: 1.6mm
  • Total Plates: 6
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