SUMMARY
A tibial plafond fracture (pilon fracture) is an intra-articular fracture of the distal tibia involving the weight-bearing surface of the ankle joint. These injuries are typically associated with comminution, articular impaction, metaphyseal bone loss, and significant soft-tissue injury.
Diagnosis is made through clinical examination and confirmed with plain radiographs, with CT scanning essential for preoperative planning.
Treatment is most often operative, using a staged protocol: temporary spanning external fixation followed by delayed open reduction and internal fixation (ORIF) once soft tissues allow.
EPIDEMIOLOGY
Incidence
5–10% of all tibial fractures
<10% of lower extremity injuries
Incidence increasing due to improved survival after high-energy trauma
Demographics
Mean age: 35–45 years
Male predominance
ETIOLOGY
Mechanism of Injury
High-energy axial load (most common)
Talus driven into the tibial plafond
Motor vehicle accidents
Falls from height
Low-energy rotational mechanisms (less common)
Alpine skiing
Pathoanatomy
Fracture pattern depends on:
Foot position at impact
Direction and magnitude of force
Typical findings:
Articular impaction and comminution
Metaphyseal bone comminution
Often three main articular fragments with intact ankle ligaments
Typical Articular Fragments
Medial malleolar fragment (deltoid ligament attachment)
Posterolateral / Volkmann fragment
(posterior-inferior tibiofibular ligament)Anterolateral / Chaput fragment
(anterior-inferior tibiofibular ligament)
Associated Injuries
Fibula fracture: ~75%
Ipsilateral lower extremity injury: ~30%
Open fractures: ~20%
Bilateral pilon fractures: 5–10%
ANATOMY
Osteology
Distal tibia forms a concave quadrilateral articular surface
Medial malleolus is pyramid-shaped
Lateral articulation via fibular notch
Ligamentous Structures (Syndesmosis)
Anterior-Inferior Tibiofibular Ligament (AITFL)
Tibial origin: Chaput tubercle
Fibular insertion: Wagstaffe tubercle
Posterior-Inferior Tibiofibular Ligament (PITFL)
Tibial origin: Volkmann tubercle
Strongest syndesmotic component
Interosseous Ligament (IOL)
Distal continuation of interosseous membrane
Inferior Transverse Ligament (ITL)
CLASSIFICATION
AO / OTA Classification
43-A: Extra-articular
43-B: Partial articular
43-C: Complete articular
Rüedi–Allgöwer Classification
Type I: Nondisplaced
Type II: Displaced, joint incongruent
Type III: Comminuted articular surface
PRESENTATION
Symptoms
Severe ankle pain
Swelling and deformity
Inability to bear weight
Physical Examination
Inspection:
Swelling, ecchymosis
Fracture blisters
Open wounds
Palpation:
Diffuse ankle tenderness
Motion:
Severely limited ankle ROM
Neurovascular:
Assess dorsalis pedis and posterior tibial pulses
Consider ABI / CT angiography if indicated
Always assess for:
Compartment syndrome
Associated musculoskeletal injuries
IMAGING
Radiographs
Views:
AP, lateral, mortise
Full-length tibia/fibula
Findings:
Articular comminution
Joint space obliteration
Medial, anterior (Chaput), posterior (Volkmann), and lateral fragments
CT Scan
Mandatory for surgical planning
Best obtained after spanning external fixation
Evaluates:
Articular involvement
Metaphyseal comminution
Fracture displacement
Axial CT may show the classic “Mercedes-Benz” sign
TREATMENT
NONOPERATIVE
Indications
Stable, nondisplaced fractures
Medically unfit or non-ambulatory patients
Severe soft-tissue compromise
Limitations
Poor articular reduction
High risk of loss of alignment
Limited soft-tissue monitoring
OPERATIVE MANAGEMENT
Temporizing Spanning External Fixation
Indications
Most length-unstable pilon fractures
Significant soft-tissue swelling
Open fractures
Goals
Restore length and alignment
Allow soft-tissue recovery
Indirect reduction via ligamentotaxis
Timing
Maintained for ~10–14 days until soft tissues improve
Definitive ORIF
Indications
Majority of pilon fractures
Once skin wrinkling and edema resolution achieved
Principles
Anatomic articular reduction
Restore:
Alignment (<5–10° varus/valgus)
Length
Fracture-specific fixation
Bone grafting if metaphyseal void present
Postoperative Care
Early ankle ROM (~2 weeks)
Non-weight bearing for 6–12 weeks
Fibula Fixation (Controversial)
Fibula fixation in pilon fractures is controversial and not routinely required for all cases.
While fibular fixation is not an obligatory step in the reconstruction of tibial plafond fractures, it may be beneficial in selected cases.
Potential indications include:
• Restoration of lateral column support
• Assistance with indirect reduction of the tibial plafond
• Improvement of ankle mortise alignment, particularly in valgus fracture patterns
• Augmentation of stability in conjunction with external fixation
Limitations and concerns:
• Does not independently improve articular reduction of the tibial plafond
• Associated with higher rates of secondary hardware removal
• May increase soft-tissue morbidity if performed through compromised lateral skin
External Fixation Alone / Circular Frames
Indications
Severe soft-tissue or bone compromise
Infeasible internal fixation
Outcomes
High union rates
Common pin-tract infections
Deep infection rare
Intramedullary Nailing + Percutaneous Screws
Select simple intra-articular fractures
Advantages:
Minimal soft-tissue disruption
Disadvantages:
Valgus malunion
Recurvatum risk
Primary Ankle Arthrodesis
Potential Indications
Non-reconstructable articular surface
Elderly or low-demand patients
Severe comminution
Trade-offs
Faster pain relief
Increased adjacent joint arthritis
COMPLICATIONS
Wound dehiscence (9–30%)
Infection (5–15%)
Malunion (6–14%)
Nonunion (~5%)
Post-traumatic ankle arthritis
Stiffness (up to 33%)
Posterior tibial tendon entrapment (often missed)
PROGNOSIS
Poorer outcomes associated with:
High fracture severity
Poor articular reduction
Medical comorbidities
Work-related injuries
Functional recovery may continue for up to 2 years, but many patients have persistent limitations.