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Load-sharing through elastic micro-motion accelerates bone formation and interbody fusion.

Eric H Ledet1, Glenn P Sanders2, Darryl J DiRisio3

  • 1ReVivo Medical, 33 Old Niskayuna Rd, Loudonville, NY 12211, USA; Department of Biomedical Engineering, Rensselaer Polytechnic Institute, 110 8th St, Troy, NY 12180, USA; R&D Service, Stratton VA Medical Center, 113 Holland Ave, Albany, NY, 12208, USA.

The Spine Journal : Official Journal of the North American Spine Society
|February 17, 2018
PubMed
Summary

An elastically deformable spinal plate significantly improved early bone formation in a goat anterior cervical discectomy and fusion (ACDF) model. This load-sharing implant shows promise for enhancing spinal fusion rates.

Keywords:
AnteriorCervicalFusionLoad-sharingMicro-motionPlate

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Spinal Fusion Research

Background:

  • Successful spinal fusion necessitates optimal biological and biomechanical conditions.
  • Load-sharing in the interbody space is crucial for enhancing bone formation.
  • Anterior cervical discectomy and fusion (ACDF) plate stiffness influences stability and load-sharing, particularly in complex cases.

Purpose of the Study:

  • To assess the efficacy of a novel elastically deformable, continuously load-sharing anterior cervical spinal plate.
  • To compare bone formation and interbody fusion rates against a translationally dynamic plate.

Main Methods:

  • An in vivo animal study utilizing a goat model for anterior cervical discectomy and fusion (ACDF).
  • Fourteen goats received either a translationally dynamic or an elastically deformable plate.
  • Evaluation involved X-ray, CT scans, and histology over 18 weeks to assess bone formation and fusion.

Main Results:

  • The elastically deformable plate demonstrated statistically significant superior early bone formation compared to the dynamic plate.
  • A trend towards enhanced bony bridging and fusion was observed with the elastically deformable plate between 8 and 18 weeks, though not statistically significant.

Conclusions:

  • Load-sharing via elastic micro-motion accelerates bone formation in the ACDF goat model.
  • The elastically deformable implant may promote early bony bridging and improve fusion rates.
  • Further research is needed to fully characterize the benefits of load-sharing through micro-motion.