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MR imaging of the ankle: normal variants
A M Noto1, Y Cheung, Z S Rosenberg
1Department of Radiology, Hospital for Joint Diseases Orthopedic Institute, New York.
Radiology
|January 1, 1989
Summary
High-resolution magnetic resonance (MR) imaging reveals common normal variants in asymptomatic ankles, which can mimic pathology. Understanding these variants is crucial for accurate ankle MR interpretation.
Area of Science:
- Radiology
- Orthopedic Imaging
Background:
- Magnetic resonance (MR) imaging is a key modality for evaluating ankle structures.
- Accurate interpretation requires distinguishing normal anatomy and variants from pathology.
Purpose of the Study:
- To identify and characterize normal anatomical variants in asymptomatic ankles using high-resolution MR imaging.
- To provide a reference for radiologists interpreting ankle MR scans.
Main Methods:
- High-resolution surface coil magnetic resonance (MR) imaging was performed on 30 asymptomatic ankles.
- Images were analyzed to identify and document common normal variants.
Main Results:
- Cortical irregularity of the posterior tibiotalar joint was seen in 27/30 cases.
- The posterior talofibular ligament showed irregular edges in 13/30 cases.
- Heterogeneous signal at the posterior tibial tendon insertion and deltoid ligament inhomogeneity were also noted.
Conclusions:
- Several common normal variants exist in asymptomatic ankles that can be mistaken for pathology on MR imaging.
- Familiarity with these variants is essential for accurate diagnosis and to avoid misinterpretation of ankle MR scans.