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Variations in Calcaneonavicular Morphology Demonstrated with Radiography¹

¹ From the Department of Diagnostic Radiology, Queen’s University, Kingston General Hospital, 76 Stuart St, Kingston, ON, Canada K7L 2V7. From the 2002 RSNA scientific assembly. Received November 27, 2002; revision requested January 22, 2003; final revision received May 28; accepted June 25. Address correspondence to J.T.L. (e-mail: 3jtl@qlink.queensu.ca).

View larger version (155K): [in a new window]   Figure 1. Type 1 calcaneonavicular morphology. Medial oblique radiograph obtained in a 22-year-old man shows minimally distracted avulsion fracture at the base of the fifth metatarsal bone (arrowhead). Note the wide calcaneonavicular gap (solid arrow) and the smooth, rounded, and well-defined calcaneal (C) and navicular (N) cortices (open arrows).

View larger version (154K): [in a new window]   Figure 2. Type 2 calcaneonavicular morphology. Medial oblique radiograph obtained in a 60-year-old woman shows undisplaced fracture at the base of the fifth metatarsal bone (white arrowhead). Note the narrow calcaneonavicular gap (solid arrow), the flattening and widening of the calcaneus where it approaches the navicular (black arrowhead), and the smooth, regular, and well-defined calcaneal (C) and navicular (N) cortices (open arrows).

View larger version (157K): [in a new window]   Figure 3. Type 3 calcaneonavicular morphology. Medial oblique radiograph obtained in an 18-year-old woman with foot sprain. Note the narrow calcaneonavicular gap (solid arrow), the flattening and widening of the calcaneus where it approaches the navicular (arrowhead), and the rough, irregular, and poorly defined calcaneal (C) and navicular (N) cortices (open arrows).

View larger version (155K): [in a new window]   Figure 4. Type 4 calcaneonavicular morphology. Medial oblique foot radiograph from author’s teaching file shows completely continuous osseous structure spanning the calcaneus (C) and navicular (N) (arrowheads).