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Related Experiment Videos

Corrosion on an internal spinal fixator system.

U Vieweg1, D van Roost, H K Wolf

  • 1Department of Neurosurgery, University of Bonn, Germany. umc705@ibm.rhrz.uni-bonn.de

Spine
|May 20, 1999
PubMed
Summary
This summary is machine-generated.

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Spinal fixators can corrode, particularly telescopic rods (crevice corrosion) and pedicle screws (fretting corrosion). This corrosion can lead to tissue reactions and necessitate explantation.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Materials Science

Background:

  • Fretting and crevice corrosion are common in retrieved stainless steel implants.
  • These corrosion types have not been previously described in spinal fixator systems.

Purpose of the Study:

  • To identify corrosion types in spinal fixators.
  • To correlate spinal fixator construction with observed corrosion.

Main Methods:

  • Prospective examination of 13 spinal fixators (26 bridges, 52 screws) implanted for a mean of 10 months.
  • Macroscopic, microscopic, photographic, spectrographic, microradiography, and x-ray fluorescence analyses were performed on implants and adjacent tissues.

Main Results:

  • Corrosion was observed on 13 telescopic rods (crevice corrosion) and 2 pedicle screws (fretting corrosion).

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  • Tissue discoloration, fibrosis, foreign body reaction, and metallosis were noted in some cases.
  • Monobloc fixator bridges showed no corrosion or significant tissue reaction.

    • Conclusions:

    • Spinal fixator design contributes to susceptibility to corrosion.
    • In vivo evaluation of new spinal implants is crucial to detect corrosion and tissue reactions.
    • Corrosion is a potential reason for explanting spinal fixation systems post-fusion.