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The BioFlex System as a Dynamic Stabilization Device : Does It Preserve Lumbar Motion?

Ho Yeol Zhang1, Jeong Yoon Park, Bo Young Cho

  • 1Department of Neurosurgery, National Health Insurance Corporation Ilsan Hospital, Yonsei University College of Medicine, Goyang, Korea.

Journal of Korean Neurosurgical Society
|December 31, 2009
PubMed
Summary

The BioFlex System preserves some spinal motion after surgery, but range of motion at implanted segments decreases one year post-operation. Lumbar lordosis is maintained, with clinical improvements observed.

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Area of Science:

  • Spine surgery
  • Orthopedic biomechanics
  • Spinal instrumentation

Background:

  • The BioFlex System is a flexible rod device designed for spinal motion preservation.
  • Limited scientific data exists on the functional motion preserved by the BioFlex System post-implantation.

Purpose of the Study:

  • To evaluate the presence and degree of functional motion one year or more after BioFlex System placement.
  • To assess the impact of the BioFlex System on spinal range of motion and lordosis.

Main Methods:

  • Prospective study of 12 patients undergoing posterior dynamic stabilization with the BioFlex System (L3-4-5 or L4-5-S1 constructs).
  • Radiographic assessment of standing neutral lateral, extension, flexion, and PA views at multiple postoperative intervals (3-12+ months).
  • Measurement of lumbar range of motion (ROM), whole lumbar lordosis, and segment-specific ROMs.
Keywords:
BioFlexDegenerative spondylolisthesisDynamic stabilizationLumbar stenosisSegmental instability

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Main Results:

  • Patients showed decreased mean lumbar ROM and segment-specific ROMs at instrumented levels one year post-surgery for both L3-4-5 and L4-5-S1 constructs.
  • Lumbar lordosis was preserved in both construct groups.
  • Significant clinical improvements were reported in both patient groups.

Conclusions:

  • The BioFlex System offers some degree of motion preservation at instrumented spinal levels.
  • While preserving overall lumbar lordosis, the system results in reduced ROM at the implanted segments compared to preoperative values.
  • Preliminary findings suggest functional motion is retained to a degree, alongside clinical benefits.