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Coalition by MSKMRI JEE EUN LEE.pdf
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Coalition involving the anterior subtalar joint is exceptionally rare compared with middle or posterior types.
Anatomy & morphology
- The anterior facet is the smallest and most variable of the three subtalar facets.
- When a coalition occurs here, it almost always coexists with a middle facet coalition rather than appearing in isolation.
- Because of its small size and variable presence, anterior facet coalitions can be easily overlooked.
Imaging findings
- Radiographs: very limited role; no reliable indirect signs.
- CT & MRI:
Clinical relevance
- Isolated anterior coalitions are so uncommon that most literature describes them only as coexisting lesions with middle facet coalitions.
- Clinical presentation is indistinguishable from other talocalcaneal coalitions (hindfoot pain, stiffness, rigid flatfoot).
- Recognition is important, as involvement of the anterior facet may increase coalition extent and surgical complexity.
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