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Single-Level Rigid Fixation Combined with Coflex: A Biomechanical Study.

Wu Che1, Qian Chen1, Yi-Qun Ma1

  • 1Department of Orthopaedic Surgery, Zhongshan Hospital, Fudan University, Shanghai, China (mainland).

Medical Science Monitor : International Medical Journal of Experimental and Clinical Research
|March 30, 2016
PubMed
Summary

Adding a Coflex device to lumbar pedicle screw-rod fixation (PSRF) enhances spinal stability compared to PSRF alone. This combination may help prevent adjacent segment degeneration.

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Area of Science:

  • Spine biomechanics
  • Orthopedic surgery
  • Biomedical engineering

Background:

  • Adjacent segment degeneration (ASD) is a concern after lumbar fusion.
  • Pedicle screw-rod fixation (PSRF) is a common surgical technique.
  • The "topping-off" phenomenon describes the biomechanical effects at segments adjacent to fusion.

Purpose of the Study:

  • To compare the biomechanics of L4-L5 PSRF with an L3-L4 Coflex device versus L4-L5 PSRF alone.
  • To evaluate kinematics and intradiscal pressure (IDP) in adjacent segments.
  • To characterize the biomechanical impact of adding a Coflex device in a topping-off scenario.

Main Methods:

  • In vitro biomechanical testing of six human cadaveric spine specimens.
  • Assessment of 3D motion under various loading conditions (flexion-extension, lateral bending, axial rotation).
  • Comparison of three configurations: intact, L4-L5 PSRF alone, and L4-L5 PSRF with L3-L4 Coflex.

Main Results:

  • Both configurations significantly increased range of motion (ROM) in adjacent segments.
  • The Coflex device provided greater stability than PSRF alone, especially in extension (p<0.05).
  • Intradiscal pressure (IDP) changes were minimal and not significantly different between the two methods (p>0.05).

Conclusions:

  • L4-L5 PSRF with an L3-L4 Coflex device offers superior stability compared to PSRF alone.
  • This combined approach is a promising alternative for preventing adjacent segment degeneration (ASD).
  • Further in vitro studies are needed to address limitations and confirm findings.