Treatment of Trimalleolar Fracture with Mild Displacement and Lateral Mortise Widening

Primary Recommendation

Surgical fixation with open reduction and internal fixation (ORIF) is indicated for trimalleolar fracture with mild displacement and lateral mortise widening, as the presence of any displacement and mortise widening indicates instability requiring operative intervention, according to Praxis Medical Insights 1, 2

Displacement >2mm mandates surgical management, as recommended by Praxis Medical Insights 1
Ankle mortise instability, defined as medial clear space >4mm, requires surgical intervention, as stated by Praxis Medical Insights 1, 2
Trimalleolar fractures are inherently unstable and require surgical management, according to Praxis Medical Insights 1, 3
Lateral widening of the mortise from posterior and lateral fibular displacement confirms instability, as identified by the American College of Radiology and Praxis Medical Insights 4, 2
The American College of Radiology identifies trimalleolar fractures as having increased incidence of instability, particularly when associated with medial tenderness, bruising, swelling, or fibular fracture patterns that disrupt the syndesmosis, as reported by the American College of Radiology and Praxis Medical Insights 4, 1

Weight-bearing radiographs, if patient can tolerate, should be obtained to assess dynamic instability, as recommended by the American College of Radiology and Praxis Medical Insights 4, 1
Standard three-view radiographs, including anteroposterior, lateral, and mortise views, should be taken, as suggested by the American College of Radiology and Praxis Medical Insights 4, 1, 3
CT imaging should be used to evaluate the posterior malleolar fragment size, comminution, and intra-articular involvement, according to the American College of Radiology 5
Measurement of medial clear space (>4mm confirms instability) is crucial, as stated by the American College of Radiology and Praxis Medical Insights 4, 1, 2