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Related Experiment Video

Updated: Dec 10, 2025

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

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An In Vitro Biomechanical Evaluation of a Lateral Lumbar Interbody Fusion Device With Integrated Lateral Modular

Ryan DenHaese1, Anup Gandhi2, Chris Ferry2

  • 1AXIS Neurosurgery and Spine, Williamsville, NY, USA.

Global Spine Journal
|September 3, 2020
PubMed
Summary

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Anterior Cervical Discectomy and Fusion With a No-Profile Integrated Fixation Allograft Device: An In Vitro Biomechanical Analysis and Clinical Case Series.

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A model for evaluating the biomechanics of rib fracture fixation.

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Biomechanical Analysis of an Interspinous Process Fixation Device with In Situ Shortening Capabilities: Does Spinous Process Compression Improve Segmental Stability?

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A Biomechanical Evaluation of a Next-Generation Integrated and Modular ACDF Device Possessing Full-Plate, Half-Plate, and No-Profile Fixation Iterations.

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Adjustable Rigid Interspinous Process Fixation: A Biomechanical Study of Segmental Lordosis and Interbody Loading in the Lumbar Spine.

Cureus·2019

A novel lumbar interbody fusion implant with 4-screw modular plate fixation (MPF) demonstrated superior stability compared to 2-screw MPF. This enhanced fixation, especially with added interspinous fixation, offers significant biomechanical advantages for spinal fusion.

Area of Science:

  • Spinal biomechanics
  • Orthopedic implant technology
  • Spinal fusion techniques

Background:

  • Lumbar interbody fusion (LLIF) is a common surgical procedure.
  • Optimizing implant stability and biomechanical performance is crucial for fusion success.
  • Novel implant designs aim to improve fixation and reduce motion-related complications.

Purpose of the Study:

  • To biomechanically evaluate a new lateral lumbar interbody fusion (LLIF) implant with integrated lateral modular plate fixation (MPF).
  • To compare the range-of-motion stiffness of various LLIF configurations.
  • To assess the biomechanical contribution of different fixation methods.

Main Methods:

  • In vitro biomechanical study using human lumbar cadavers (L1-L4).
  • Segmental range-of-motion stiffness was measured using a 6-degree-of-freedom kinematics system under applied moments.
Keywords:
PEEK cagesXLIFbiomechanicscadaverdegenerative disc diseasefixationfusionlumbarlumbar interbody fusionsagittal balance

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Related Experiment Videos

Last Updated: Dec 10, 2025

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  • Specimens were tested intact and with iterative instrumentation: LLIF cage only, LLIF + 2-screw MPF, LLIF + 4-screw MPF, LLIF + 4-screw MPF + interspinous fixation, and LLIF + bilateral pedicle screws.

    • Main Results:

    • Four-screw MPF significantly increased flexion/extension stiffness compared to 2-screw MPF (P < .01).
    • LLIF with 2- and 4-screw MPF showed comparable lateral bending and axial rotation stiffness to bilateral pedicle screws (P = 1.0).
    • LLIF with 4-screw MPF and interspinous fixation matched bilateral pedicle screw fixation stability across all motions (P ≥ .6).

    Conclusions:

    • The 4-screw MPF configuration offers enhanced biomechanical stability over 2-screw MPF for LLIF.
    • Combining LLIF with 4-screw MPF and interspinous fixation creates a robust circumferential construct.
    • This construct demonstrates significant biomechanical utility across principal spinal motions.