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Cidex-induced synovitis.

C D Harner1, F H Fu, G C Mason

  • 1Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh, Pennsylvania.

The American Journal of Sports Medicine
|January 1, 1989
PubMed
Summary
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Glutaraldehyde (Cidex) causes chemical synovitis in rabbit knees, with inflammation severity increasing with concentration. Proper double-rinsing techniques significantly reduce Cidex levels, preventing joint inflammation.

Area of Science:

  • Orthopedics
  • Biomaterials Science
  • Toxicology

Background:

  • Glutaraldehyde (Cidex) is a high-level disinfectant used in arthroscopic surgery.
  • Concerns exist regarding potential intra-articular toxicity from residual disinfectant.
  • Understanding Cidex's effects on synovial tissue is crucial for patient safety.

Purpose of the Study:

  • To evaluate the synovial response to varying concentrations of glutaraldehyde (Cidex).
  • To determine the relationship between Cidex concentration and the severity of induced synovitis.
  • To assess the effectiveness of different rinsing protocols in mitigating Cidex toxicity.

Main Methods:

  • Rabbit knees were injected with different concentrations of Cidex (10 ppm to 100+ ppm).
  • Synovial tissue was examined microscopically for inflammatory changes.

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  • Intraoperative rinse solutions were analyzed for Cidex concentrations.
  • The impact of single versus double rinsing techniques was investigated.
  • Main Results:

    • Microscopic inflammation, including hypertrophy and edema, was observed at 10 ppm Cidex.
    • Higher concentrations (100+ ppm) induced necrosis, hemorrhage, and diffuse synovitis.
    • Inflammation severity correlated directly with Cidex concentration.
    • Single-use rinse solutions reached up to 300 ppm, increasing to 1000 ppm with reuse.
    • Double-rinsing protocols reduced second rinse concentrations to below 10 ppm.

    Conclusions:

    • Glutaraldehyde induces a dose-dependent chemical synovitis, not an allergic reaction.
    • Single-use rinsing protocols can lead to significant intra-articular Cidex exposure.
    • Double-rinsing, with changes between cases, effectively minimizes residual Cidex and prevents joint inflammation.