Classification scheme for fifth metatarsal base fractures based on CT three-dimensional reconstruction

Area of Science:

• Orthopedic surgery
• Foot and ankle trauma
• Radiographic analysis

Background:

• Traditional fifth metatarsal base (MTB5) fracture classifications inadequately address injuries involving adjacent joints.
• Clinical debate persists regarding the optimal management of complex MTB5 fractures.

Purpose of the Study:

• To introduce and validate a novel classification system for MTB5 fractures based on articular involvement.
• To utilize 3D fracture line mapping and heatmap analysis for precise injury characterization.

Main Methods:

• Retrospective analysis of imaging data from 98 patients with MTB5 fractures.
• 3D reconstruction and fracture line mapping using Mimics and 3-matic software.
• Generation of heatmaps to visualize fracture patterns and delineate high-risk zones relative to joint margins.

Main Results:

• A new six-type classification system was developed: non-articular (IA-IC) and articular (IIA-IIC).
• Articular fractures involving the fifth metatarsal-cuboid and fourth-fifth metatarsal joints were identified.
• Quantitative delineation of high-risk fracture zones relative to joint boundaries was achieved for each subtype.

Conclusions:

• The proposed six-type classification system for MTB5 fractures accurately differentiates non-articular and articular injuries.
• 3D heatmap analysis provides a robust method for characterizing fracture patterns and joint involvement.
• This novel classification has the potential to guide treatment strategies and improve patient outcomes.