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Coalition by MSKMRI JEE EUN LEE.pdf
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Definition & Morphology
- Linear coalition: parallel or nearly parallel to subtalar joint plane.
- May show posterior hooking:
Prevalence & Location
- Most common type – 64% (45/70 feet).
- Usually involves middle facet, but can extend to middle + posterior, or isolated posterior joint.
- All cases with posterior calcaneal hooking = posterior facet involvement.
Associated Findings
- Fracture fragments seen in 8 feet, especially with posterior hooking.
- More often from calcaneus (posterior calcaneal hooking) but can arise from talus.
- Important for surgeons: fragments may cause symptoms and often need removal.
Imaging role
- Best detected on coronal CT/MRI.
- Look for linear interface ± posterior hooking, fracture fragments, and facet involvement pattern.
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