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Sacroiliitis: MR imaging findings.

M D Murphey1, L H Wetzel, J M Bramble

  • 1Department of Diagnostic Radiology, University of Kansas Medical Center, Kansas City 66103.

Radiology
|July 1, 1991
PubMed
Summary
This summary is machine-generated.

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Magnetic resonance (MR) imaging effectively detects sacroiliitis by revealing abnormal cartilage and bone erosions. This advanced imaging technique surpasses computed tomography (CT) in evaluating sacroiliac joints, especially when CT results are unclear.

Area of Science:

  • Radiology
  • Medical Imaging
  • Orthopedics

Background:

  • Sacroiliitis, inflammation of the sacroiliac joints, presents diagnostic challenges.
  • Conventional imaging techniques like computed tomography (CT) have limitations in fully characterizing sacroiliitis.
  • Magnetic resonance (MR) imaging offers high soft tissue contrast, potentially improving diagnostic accuracy.

Purpose of the Study:

  • To compare the efficacy of MR imaging versus CT in diagnosing sacroiliitis.
  • To define the characteristic MR imaging appearance of normal and inflamed sacroiliac joints.
  • To assess MR imaging's superiority in evaluating cartilage and detecting erosions associated with sacroiliitis.

Main Methods:

  • MR imaging was conducted on seven asymptomatic volunteers and 17 patients with clinical sacroiliitis.

Related Experiment Videos

  • Findings from MR imaging were compared with CT scans of the same sacroiliac joints.
  • Analysis focused on cartilage signal intensity, erosions, and T1- and T2-weighted image characteristics.

    • Main Results:

    • MR imaging identified sacroiliitis in 20 sacroiliac joints (12 patients), showing abnormal cartilage signal (95%) and erosions (75%) on T1-weighted images.
    • T2-weighted images revealed increased signal intensity in the articulation (80%) and erosions (60%).
    • MR imaging demonstrated superiority over CT in cartilage evaluation and erosion detection, with four joints and two patients showing MR-positive sacroiliitis that was CT-negative.

    Conclusions:

    • MR imaging is a highly valuable tool for detecting sacroiliitis, particularly when CT findings are inconclusive.
    • Characteristic MR imaging findings include abnormal cartilage signal and erosions, with specific patterns on T1- and T2-weighted sequences.
    • The enhanced sensitivity of MR imaging for cartilage and erosions makes it a preferred modality for diagnosing sacroiliitis.