Courtesy: Prof Nabil Ebraheim, University of Toledo, Ohio, USA

Introduction

Pilon fractures involve the distal tibial articular surface (tibial plafond) and are typically caused by high-energy axial loading.

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Key Characteristics

• Articular comminution
• Metaphyseal impaction
• Severe soft-tissue injury

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Why Classification Matters

• Determines severity
• Guides treatment strategy
• Predicts prognosis

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Common Classification Systems

• Rüedi–Allgöwer classification
• AO/OTA classification

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Rüedi–Allgöwer Classification

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Concept

Based on:

• Articular displacement
• Degree of comminution

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Type I

Features

• Cleavage fracture
• Minimal or no displacement
• Articular surface congruent
• Minimal metaphyseal injury

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Prognosis

• Good

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Type II

Features

• Displaced intra-articular fracture
• Articular incongruity present
• Minimal metaphyseal comminution

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Prognosis

• Moderate

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Type III

Features

• Severe articular comminution
• Marked metaphyseal impaction
• Highly unstable

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Prognosis

Poor

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AO/OTA Classification (Distal Tibia)

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Concept

Based on articular involvement

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Three Main Types

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Type A – Extra-Articular

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Features

• No articular involvement

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Subtypes

A1

• Simple fracture

A2

• Metaphyseal wedge

A3

• Complex metaphyseal fracture

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Type B – Partial Articular

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Concept

• Part of articular surface remains attached to shaft

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Subtypes

B1 – Split Fracture

• Vertical split of articular surface

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B2 – Split + Depression

• Vertical fracture + articular impaction

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B3 – Multifragmentary Depression

• Multiple depressed fragments

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Type C – Complete Articular

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Concept

• Articular surface completely separated from shaft

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Subtypes

C1

• Simple articular
• Simple metaphyseal

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C2

• Simple articular
• Comminuted metaphyseal

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C3

• Multifragmentary articular
• Multifragmentary metaphyseal

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Clinical Insight

C3 fractures = most severe injuries

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Classical Pilon Fracture Fragments

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Three Key Articular Fragments

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1. Medial Malleolar Fragment

• Attached to deltoid ligament

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2. Chaput Fragment (Anterolateral)

• Attached to AITFL

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3. Volkmann Fragment (Posterolateral)

• Attached to PITFL

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Clinical Importance

 Understanding fragments helps in:

• Surgical planning
• Fixation strategy

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Radiological Evaluation

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CT Scan (Essential)

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Findings

• Articular comminution
• Depressed fragments
• Metaphyseal involvement
• Fragment configuration

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Key Role

Mandatory for surgical planning

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Surgical Principles

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Goals of Treatment

• Restore articular congruity
• Elevate depressed fragments
• Achieve stable fixation

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Fixation Methods

• Screws parallel to joint surface
• Buttress plates
• Antiglide plates

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Important Clinical Note

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Intact Fibula Scenario

If fibula remains intact:

• Force may instead cause:
  • Lateral collateral ligament injury

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Key Exam Points

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High-Yield Facts

• Rüedi Type III – worst prognosis
• AO/OTA C3 – most severe pilon fractures
• CT scan – essential investigation

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Classic Fragment Pattern

• Medial
• Chaput
• Volkmann

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Clinical Insight

 Pilon fractures are:

• High-energy injuries
• Associated with soft-tissue damage
• Require staged management in many cases