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Detection of ankle effusions: comparison study in cadavers using radiography, sonography, and MR imaging
J A Jacobson1, R Andresen, S Jaovisidha
1Department of Radiology, Veterans Administration Medical Center, San Diego, CA 92151, USA.
AJR. American Journal of Roentgenology
|May 9, 1998
Summary
Magnetic resonance imaging (MRI) and sonography are more sensitive than radiography for detecting ankle effusions. Imaging technique sensitivity is influenced by ankle position, with MR imaging being the most sensitive overall.
Area of Science:
- Orthopedics
- Radiology
- Medical Imaging
Background:
- Ankle effusions are common in orthopedic injuries.
- Accurate detection of joint fluid is crucial for diagnosis and treatment planning.
- Conventional radiography has limitations in visualizing small fluid collections.
Purpose of the Study:
- To compare the sensitivity of radiography, sonography, and MR imaging in detecting ankle effusions.
- To evaluate the impact of ankle positioning on imaging sensitivity.
Main Methods:
- Three cadaveric ankle specimens were used.
- Saline solution was incrementally instilled into the ankle joints.
- Imaging was performed in neutral, dorsiflexion, and plantar flexion positions using radiography, sonography, and MR imaging.
- Three observers evaluated images for the presence of joint effusion.
Main Results:
- MR imaging detected 1 ml of fluid in various ankle positions.
- Sonography detected 2 ml of fluid in neutral and plantar flexion positions.
- Radiography detected 5 ml of fluid in a neutral position.
Conclusions:
- MR imaging demonstrated the highest sensitivity for detecting ankle effusions, followed by sonography and then radiography.
- The sensitivity of each imaging modality is significantly influenced by the ankle's joint position.