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Central pseudodefect of the talus: a potential ankle MR interpretation pitfall
1Department of Radiology, Hospital for Joint Diseases/New York University Medical Center, NY 10003, USA.
Journal of Computer Assisted Tomography
|October 19, 1999
Summary
The central pseudodefect of the talus is a common finding on ankle MRIs, often mistaken for a lesion. This study identifies its appearance and origin from the deltoid ligament insertion.
Area of Science:
- Radiology
- Orthopedic Imaging
- Anatomy
Background:
- The central pseudodefect of the talus is a common finding on ankle MRI.
- It can be mistaken for an osteochondral lesion, leading to misdiagnosis.
- Understanding its imaging features is crucial for accurate interpretation.
Purpose of the Study:
- To outline the magnetic resonance (MR) features of the central pseudodefect of the talus.
- To assess the prevalence of this normal finding.
- To elucidate the origin of this potentially misleading MR appearance.
Main Methods:
- Retrospective evaluation of 31 ankle MR studies (10 asymptomatic volunteers, 21 patients).
- Documentation of signal, size, and shape of the pseudodefect.
- Cross-referencing sagittal images with axial and coronal views.
Main Results:
- A hypointense, curvilinear band (8-15 x 3-8 mm) was observed in 60-62% of subjects.
- The pseudodefect was typically located below the articular surface.
- Axial and coronal imaging revealed the band corresponded to the deep tibiotalar fibers of the deltoid ligament insertion.
Conclusions:
- The central pseudodefect of the talus is a frequent finding caused by deltoid ligament fiber insertion.
- Knowledge of its characteristic MR appearance is essential to prevent misdiagnosis as an osteochondral lesion.
- This finding aids in accurate interpretation of ankle MR studies.