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Corpectomy cage subsidence with rectangular versus round endcaps.

Armen R Deukmedjian1, Jotham Manwaring1, Tien V Le1

  • 1Department of Neurosurgery and Brain Repair, University of South Florida, 2 Tampa General Circle, 7th floor, Tampa, FL 33606, USA.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|May 17, 2014
PubMed
Summary

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Rectangular endcap corpectomy cages show improved resistance to subsidence compared to round endcap designs. This biomechanical testing suggests rectangular cages may offer better spinal stability and reduce risks associated with vertebral body replacement surgery.

Area of Science:

  • Spine biomechanics
  • Orthopedic implant design
  • Spinal fusion devices

Background:

  • Corpectomy cages are used in spinal fusion surgery to replace vertebral bodies.
  • Cage subsidence, or settling into the vertebral endplate, is a complication that can affect outcomes.
  • Endcap design may influence cage stability and subsidence risk.

Purpose of the Study:

  • To compare the subsidence resistance of corpectomy cages with rectangular versus round endcaps.
  • To evaluate the biomechanical performance of these cages under cyclic loading.

Main Methods:

  • Fourteen cadaveric spinal segments (T12-L2) underwent L1 corpectomy and implantation of either a rectangular or round endcap cage.
  • Constructs were subjected to cyclic biomechanical testing with increasing load magnitude.
Keywords:
Complication avoidanceCorpectomyExpandable cageLateral approachMinimally invasiveRectangular endcapSubsidence

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  • Testing continued until 6mm actuator displacement or completion at 2400 N.

    • Main Results:

    • Rectangular endcap cages demonstrated higher numbers of cycles, maximum compressive force, and force-cycles product compared to round endcap cages.
    • These differences became statistically significant after normalizing for bone mineral density (p⩽0.030).
    • Rectangular endcaps showed increased resistance to subsidence under cyclic loading.

    Conclusions:

    • Rectangular endcap corpectomy cages exhibit superior resistance to subsidence compared to round endcap designs.
    • The findings suggest that rectangular endcaps may offer improved stability and reduced subsidence risk in clinical applications.
    • This design modification could enhance the long-term efficacy of vertebral body replacement procedures.