What imaging modality is best for evaluating fibrous calcaneonavicular coalition?

What imaging modality is best for evaluating fibrous calcaneonavicular coalition?

• A. MRI
• B. CT scan
• C. Standard radiographs
• D. Ultrasound

Answer: (A)

Assessing fibrous calcaneonavicular coalition hinges on identifying the tissue that forms the bridge and any associated joint or soft-tissue changes. MRI provides superior soft-tissue contrast and can differentiate fibrous tissue from cartilaginous or osseous bridging. On MRI, a fibrous coalition appears as a band of low signal bridging the calcaneus and navicular, which helps confirm nonosseous (fibrous) continuity. MRI also reveals any adjacent marrow edema, inflammatory changes, cartilage involvement, or subtalar joint pathology that may accompany symptoms, all of which guide treatment decisions. Standard radiographs often miss fibrous coalitions because there is no bone bridge to visualize; CT excels at detailing bony (osseous) coalitions but is less informative about fibrous tissue. Ultrasound has limited utility for deep tarsal coalitions. Hence, MRI is the best choice for evaluating fibrous calcaneonavicular coalition.

Assessing fibrous calcaneonavicular coalition hinges on identifying the tissue that forms the bridge and any associated joint or soft-tissue changes. MRI provides superior soft-tissue contrast and can differentiate fibrous tissue from cartilaginous or osseous bridging. On MRI, a fibrous coalition appears as a band of low signal bridging the calcaneus and navicular, which helps confirm nonosseous (fibrous) continuity. MRI also reveals any adjacent marrow edema, inflammatory changes, cartilage involvement, or subtalar joint pathology that may accompany symptoms, all of which guide treatment decisions. Standard radiographs often miss fibrous coalitions because there is no bone bridge to visualize; CT excels at detailing bony (osseous) coalitions but is less informative about fibrous tissue. Ultrasound has limited utility for deep tarsal coalitions. Hence, MRI is the best choice for evaluating fibrous calcaneonavicular coalition.