FIGURE 6-23. The appearance of this “flattened” talar dome is purely positional in nature. Note that the fibular malleolus (F) is posterior in position relative to the tibial malleolus (T).
FIGURE 6-27. Variant calcaneal tubercles and tuberosities. A: Enlarged and prominent peroneal tubercle (arrowhead), dorsoplantar view. B: Large peroneal tubercle (arrowhead), axial view (different patient from A). C: Large anterior tuberosity (arrow) (lateral view). Also note the variant increased density that runs between the medial tubercle inferiorly and the Achilles tendon enthesis posteriorly. D: Incomplete hook-shaped lateral tuberosity (arrow) and resultant foramen.
FIGURE 6-29. Distal tibial and fibular variants of form. A: Elongated fibular malleolus (arrowhead). B: Tubercle along medial aspect of tibial malleolus (arrowhead), a bilateral and symmetrical finding. C: Small tubercle along posterior surface of distal tibia (arrowhead), found bilaterally. D: Prominence of the posterior aspect of the distal fibula (arrow), a bilateral finding.
FIGURE 6-20. Navicular variants of form: Tubercle along medial surface anterior to the tuberosity (arrow).
FIGURE 6-21. Prominent ridge along the talar head/neck superiorly (arrowhead).
FIGURE 6-22. Variant of talar posterolateral process: Prominent trigonal process.
FIGURE 6-23. The appearance of this “flattened” talar dome is purely positional in nature. Note that the fibular malleolus (F) is posterior in position relative to the tibial malleolus (T).
FIGURE 6-24. Variation of calcaneal form/length. A: Elongated with normal contours. B: Short with enlarged posterior segment.
FIGURE 6-25. Flattened inferior calcaneal surface (arrowheads).
FIGURE 6-26. Variation of the anterior process: Enlarged and projecting superiorly (arrowheads), simulating an “anteater” calcaneus.
FIGURE 6-27. Variant calcaneal tubercles and tuberosities. A: Enlarged and prominent peroneal tubercle (arrowhead), dorsoplantar view. B: Large peroneal tubercle (arrowhead), axial view (different patient from A). C: Large anterior tuberosity (arrow) (lateral view). Also note the variant increased density that runs between the medial tubercle inferiorly and the Achilles tendon enthesis posteriorly. D: Incomplete hook-shaped lateral tuberosity (arrow) and resultant foramen.
FIGURE 6-28. Subtalar joint variation. A: Absent anterior subtalar joint (arrowheads). B: Separate facet for anterior subtalar joint (arrowheads).
FIGURE 6-29. Distal tibial and fibular variants of form. A: Elongated fibular malleolus (arrowhead). B: Tubercle along medial aspect of tibial malleolus (arrowhead), a bilateral and symmetrical finding. C: Small tubercle along posterior surface of distal tibia (arrowhead), found bilaterally. D: Prominence of the posterior aspect of the distal fibula (arrow), a bilateral finding.