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Three-dimensional Navigation-guided, Prone, Single-position, Lateral Lumbar Interbody Fusion Technique

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Biomechanical Analysis for Enhanced Expulsion-Proof Intervertebral Fusion Device.

Shaolong Tang¹, Dan Pan², Siyuan Chen²

¹Department of Orthopedics, The Second Affiliated Hospital of Medical College of Zhejiang University, Hangzhou 310000, Zhejiang China; Department of Spinal Surgery, Zhuzhou Central Hospital, Zhuzhou 412000, Hunan, China.

Journal of Biomechanical Engineering

|January 10, 2025

Summary

The enhanced expulsion-proof intervertebral fusion device (EEIFD) shows superior expulsion prevention and comparable subsidence performance to traditional devices. This innovation improves spinal fusion stability and reduces risks associated with device migration.

Keywords:

biomechanics cage expulsion intervertebral fusion device

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Area of Science:

Orthopedic biomechanics
Spinal fusion device engineering

Background:

Traditional transforaminal lumbar interbody fusion devices (TTLIFD) can be prone to subsidence and expulsion.
Enhancing the mechanical stability of interbody fusion devices is crucial for successful spinal fusion outcomes.

Purpose of the Study:

To compare the biomechanical performance, specifically sinking and shifting characteristics, of an enhanced expulsion-proof intervertebral fusion device (EEIFD) against a traditional transforaminal lumbar interbody fusion device (TTLIFD).

Main Methods:

Mechanical testing of five EEIFD and five TTLIFD specimens.
Tests included static axial compression, static subsidence, dynamic subsidence, and expulsion.
A blade-cutting torque test was performed on the EEIFD to evaluate expulsion resistance.

Main Results:

The EEIFD demonstrated comparable performance to the TTLIFD in static axial compression and subsidence tests.
The EEIFD exhibited significantly higher maximum expulsion force when the blade was rotated out compared to when not rotated.
The EEIFD's maximum expulsion force with blade rotation was significantly greater than that of the TTLIFD.

Conclusions:

The enhanced expulsion-proof intervertebral fusion device (EEIFD) effectively improves expulsion prevention capabilities.
The EEIFD offers comparable anti-subsidence performance to traditional devices.
These findings suggest the EEIFD enhances spinal fusion stability and reduces the risk of device migration.