The effects of radiofrequency bipolar thermal energy on human meniscal tissue.

Bulletin (Hospital for Joint Diseases (New York, N.Y.)) · 2003 · Mixed · Low evidence

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MixedLow evidencePaper 3700

Study snapshot

PublicationBulletin (Hospital for Joint Diseases (New York, N.Y.)) · 2003

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

This study performed the first in vitro histological analysis of the effects of bipolar thermal energy on human meniscal tissue. Sixteen fresh human menisci were mounted on a cutting block and placed in a water bath simulating an arthroscopic environment. Each specimen was divided into four sections and randomized to one of four treatment options: 1. thermal ablation with a bipolar multielectrode 3 mm Covac wand (power 3 setting); 2. thermal ablation with a bipolar multielectrode 3 mm Covac wand (power setting 7); 3. resection with a scalpel blade; and 4. resection with a motorized 4.5 full-radius resector. Six micron sections were cut and stained with Hematoxylin and Eosin and Masson's trichrome stain. Menisci were evaluated for the contour of the cut edge: straight, jagged, frayed, or combined. The zone of thermal necrosis and zone of thermal alteration were determined by examining the differential staining of the connective tissue and measuring the affected area. Menisci treated with the bipolar thermal probe were noted to have a smoother contoured edge in comparison to motorized cutters. The zone of thermal penetration for the Arthrocare power setting 3 averaged 0.18 mm (range: 0.09 to 0.20; SD 0.04) and for Arthrocare power setting 7 averaged 0.33 mm (range: 0.26 to 0.36; SD 0.03). The difference in thermal penetration between Arthrocare power settings 3 and 7 was 0.15 mm. This was statistically significant at p < 0.0001 (95% CI: 0.11 to 0.19 mm). The zone of thermal penetration was non-existent for the shaver and scalpel groups. This study provides the first histological description of the effects of bipolar radiofrequency energy on meniscal tissue. It demonstrates that there is intra-substance thermal penetration and alteration of the meniscal tissue. Its clinical significance is unclear and further in vivo studies are needed to address its clinical applicability.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro

Effect directionmixed

PopulationHuman meniscal tissue (fresh human menisci)

Sample size16

ExposureRF

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In vitro, menisci treated with a bipolar radiofrequency thermal probe had smoother contoured cut edges compared with motorized cutters. Thermal penetration averaged 0.18 mm at power setting 3 and 0.33 mm at power setting 7; the difference (0.15 mm) was statistically significant (p < 0.0001, 95% CI 0.11 to 0.19 mm). No thermal penetration was observed in the shaver and scalpel groups; clinical significance was stated as unclear.

Outcomes measured

Histological contour of cut edge (straight/jagged/frayed/combined)
Zone of thermal necrosis
Zone of thermal alteration
Depth/zone of thermal penetration (mm)

Limitations

In vitro study (not in vivo/clinical outcomes not assessed)
Clinical significance stated as unclear; further in vivo studies needed
Exposure parameters such as RF frequency, dose metrics (e.g., SAR), and exposure duration not reported in abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "bipolar radiofrequency thermal probe (Arthrocare/Covac wand)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Human meniscal tissue (fresh human menisci)",
  "sample_size": 16,
  "outcomes": [
    "Histological contour of cut edge (straight/jagged/frayed/combined)",
    "Zone of thermal necrosis",
    "Zone of thermal alteration",
    "Depth/zone of thermal penetration (mm)"
  ],
  "main_findings": "In vitro, menisci treated with a bipolar radiofrequency thermal probe had smoother contoured cut edges compared with motorized cutters. Thermal penetration averaged 0.18 mm at power setting 3 and 0.33 mm at power setting 7; the difference (0.15 mm) was statistically significant (p < 0.0001, 95% CI 0.11 to 0.19 mm). No thermal penetration was observed in the shaver and scalpel groups; clinical significance was stated as unclear.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro study (not in vivo/clinical outcomes not assessed)",
    "Clinical significance stated as unclear; further in vivo studies needed",
    "Exposure parameters such as RF frequency, dose metrics (e.g., SAR), and exposure duration not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "bipolar radiofrequency",
    "thermal energy",
    "meniscus",
    "histology",
    "thermal penetration",
    "arthroscopy",
    "Arthrocare",
    "Covac wand"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: 15156808

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