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Infrapatellar pigmented villonodular synovitis: arthrographic detection.

M B Lowenstein, J R Smith, S Cole

    AJR. American Journal of Roentgenology
    |August 1, 1980
    PubMed
    Summary
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    Arthrography can help differentiate infrapatellar pigmented villonodular synovitis from other conditions. Distinguishing between demarcated and contiguous densities improves preoperative diagnosis accuracy.

    Area of Science:

    • Orthopedic Surgery
    • Radiology
    • Pathology

    Background:

    • Pigmented villonodular synovitis (PVNS) can affect the knee joint.
    • Accurate preoperative diagnosis of localized PVNS is crucial for appropriate treatment.
    • Infrapatellar abnormalities can be challenging to diagnose preoperatively.

    Purpose of the Study:

    • To evaluate the utility of arthrography in differentiating localized infrapatellar pigmented villonodular synovitis.
    • To establish specific arthrographic criteria for preoperative diagnosis.

    Main Methods:

    • Seven patients with an ovoid density in the infrapatellar fat pad region underwent arthrography.
    • The appearance of the density (demarcated or contiguous with the fat pad) was analyzed.
    • Arthrotomy was performed in select cases for definitive diagnosis.

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    Main Results:

    • Three patients had a demarcated density; two were diagnosed with localized PVNS upon arthrotomy.
    • Four patients had a contiguous density; two showed no infrapatellar abnormality at arthrotomy.
    • Arthrographic distinction between demarcated and contiguous densities correlated with the presence of PVNS.

    Conclusions:

    • Arthrographic findings, specifically the demarcation of an ovoid density, can aid in the preoperative diagnosis of infrapatellar PVNS.
    • This distinction may help prevent overdiagnosis and unnecessary surgical intervention for infrapatellar abnormalities.