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Related Experiment Videos

Air or CO2 for knee arthrography?

J H Mink, R Dickerson

    AJR. American Journal of Roentgenology
    |May 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Room air is a superior negative agent for double-contrast knee arthrography compared to carbon dioxide (CO2), causing less pain and offering practical advantages. This finding supports air

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    Area of Science:

    • Orthopedic imaging
    • Radiology

    Background:

    • Double-contrast arthrography is a key diagnostic tool for knee joint evaluation.
    • Both air and carbon dioxide (CO2) have been utilized as negative contrast agents.

    Purpose of the Study:

    • To compare the efficacy and patient experience of using room air versus CO2 as the negative agent in double-contrast knee arthrography.
    • To assess the impact of each gas on joint fluid pH and associated pain levels.

    Main Methods:

    • A comparative study involving 39 patients undergoing double-contrast knee arthrography.
    • 20 arthrograms utilized CO2, and 20 utilized room air as the negative agent.
    • Joint fluid pH changes were measured, and patient-reported pain was recorded.

    Main Results:

    • The CO2 group reported significantly more pain (12/20 patients) compared to the air group (2/20 patients).
    • Severe pain was noted in five patients receiving CO2.
    • A direct correlation was observed between decreased joint fluid pH and the incidence of pain, irrespective of the gas used.

    Conclusions:

    • Room air is preferable to CO2 for double-contrast knee arthrography due to reduced patient discomfort.
    • Air offers additional benefits including longer joint persistence for potential refilming, lower cost, and ready availability.
    • The observed pH changes highlight a potential mechanism for gas-induced pain in arthrography.