Analysis and improvement of the three-column spinal theory

Area of Science:

• Spine biomechanics
• Orthopedic research
• Trauma surgery

Background:

• The widely accepted Denis and Ferguson three-column spinal theory lacks comprehensive data.
• This theory was based on observation and experience, not rigorous analysis.
• A need exists to refine the existing three-column spinal theory.

Purpose of the Study:

• To analyze and improve the Denis and Ferguson three-column spinal theory.
• To propose a novel three-column concept integrating epidemiology, morphology, and biomechanics.
• To enhance the understanding of vertebral fracture mechanisms.

Main Methods:

• Retrospective analysis of computed tomography (CT) imaging data from 459 patients with T11-L5 vertebral fractures (2010-2018).
• Three-dimensional (3D) mapping techniques to visualize fracture line distribution.
• Vertebral finite element force analysis using a healthy volunteer model.

Main Results:

• Fracture lines predominantly occurred in the upper and outer thirds of the vertebra, originating from the anterior vertebral pedicles.
• Finite element analysis identified the posterior third of the vertebral body anterior to the spinal canal as a primary stress center during spinal flexion/extension.
• Increased stress on the vertebral body anterior to the pedicles was observed during lateral bending.

Conclusions:

• The posterior vertebral body sections anterior to the spinal canal and pedicles exhibit distinct fracture characteristics and spinal canal risks.
• These distinct sections warrant classification as separate columns.
• The proposed Su's three-column theory aligns with vertebral structure, fracture patterns, and biomechanics.