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[MR imaging of femoral head avascular necrosis with STIR sequence]

H Sugimoto, O Tanaka, T Ohsawa

    Nihon Igaku Hoshasen Gakkai Zasshi. Nippon Acta Radiologica
    |August 25, 1989
    PubMed

    Insights

    Short TI IR (STIR) MRI effectively visualizes the reactive interface in early osteonecrosis. This technique highlights the high signal intensity characteristic of the interface, aiding in early diagnosis.

    Area of Science:

    • Radiology
    • Magnetic Resonance Imaging
    • Bone Pathology

    Context:

    • Osteonecrosis diagnosis often relies on identifying the reactive interface (RI).
    • Understanding RI signal characteristics is crucial for early detection.
    • Standard MRI sequences may not always clearly delineate the RI.

    Purpose:

    • To analyze the signal characteristics of the reactive interface (RI) in uncomplicated bone necrosis.
    • To evaluate the utility of short TI IR (STIR) and other MR pulse sequences at 0.22 tesla for RI visualization.
    • To determine the optimal MR technique for demonstrating RI in early osteonecrosis.

    Summary:

    • MR imaging of the hip was performed using STIR and short/long TR sequences at 0.22 tesla.
    • The reactive interface (RI) appeared as a high-signal line or ring on STIR, mirroring the shape on short TR images.
    • The high signal intensity of RI on STIR is attributed to prolonged T1 and T2 relaxation times due to high water content.

    Impact:

    • STIR sequence is uniquely effective in demonstrating the reactive interface in early osteonecrosis.
    • This finding can improve the accuracy and timeliness of osteonecrosis diagnosis.
    • Enhanced visualization of RI may lead to earlier intervention and better patient outcomes.

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