FIGURE 6-3. Bipartite navicular. A: DP view: comma-shaped larger medial segment; the arrow identifies the smaller superolateral segment. Also note the medial subluxation of navicular relative to talar head. B: Lateral view: partition is not clearly seen (arrowhead); odd presentation of the lateral cuneiform-navicular articulation (straight arrow).
FIGURE 6-4. Supernumerary bones. A: Duplicate distal and middle phalanges, second toe (a unilateral finding). B: Duplicate hallux (a unilateral finding). C: Duplicate fifth metatarsal and toe (a bilateral finding).
FIGURE 6-6. Varying presentation of the ungual tuberosity. Multiple distal indentations (arrowheads). (Also note the enlarged basal inferomedial tubercle, the superimposed sclerotic anterior aspect of the flexor tuberosity, and an os interphalangeus.)
FIGURE 6-9. Varying presentation of the middle phalanx. Lateral aspect of second toe middle phalanx is significantly shorter than the medial aspect, resulting in angulation of the distal phalanx laterally. Note also the square middle phalanges of the third and fourth toes.
огромное СПАСИБО ВАМ!!!
Normal Variants and Anomalies
ROBERT A. CHRISTMAN
FIGURE 6-1. Bipartite tibial sesamoid. A: Transverse partition. B: Longitudinal partition. C: Lateral oblique view for evaluating tibial sesamoid.
FIGURE 6-2. Bipartite medial cuneiform. A: Complete partition (arrowheads). B: Incomplete partition posteriorly (arrow).
FIGURE 6-3. Bipartite navicular. A: DP view: comma-shaped larger medial segment; the arrow identifies the smaller superolateral segment. Also note the medial subluxation of navicular relative to talar head. B: Lateral view: partition is not clearly seen (arrowhead); odd presentation of the lateral cuneiform-navicular articulation (straight arrow).
FIGURE 6-4. Supernumerary bones. A: Duplicate distal and middle phalanges, second toe (a unilateral finding). B: Duplicate hallux (a unilateral finding). C: Duplicate fifth metatarsal and toe (a bilateral finding).
FIGURE 6-5. Absent normally existing bones. A: Tibial sesamoid (a bilateral finding). B: Middle phalanges (a unilateral finding). C: Cuneiforms, metatarsals, and toes (a bilateral finding).
FIGURE 6-6. Varying presentation of the ungual tuberosity. Multiple distal indentations (arrowheads). (Also note the enlarged basal inferomedial tubercle, the superimposed sclerotic anterior aspect of the flexor tuberosity, and an os interphalangeus.)
FIGURE 6-7. Varying presentations of the distal phalanx shaft. A: Enlarged flexor tuberosity (lateral view). B: Enlarged flexor tuberosity (dorsoplantar view, a bilateral finding). C: Wavy medial and lateral margins mimicking periosteal reaction (a bilateral finding).
FIGURE 6-8. Varying presentation of the distal phalanx base: Absent tubercles (a bilateral finding). Compare to the enlarged tubercle in Figure 6-6.
FIGURE 6-9. Varying presentation of the middle phalanx. Lateral aspect of second toe middle phalanx is significantly shorter than the medial aspect, resulting in angulation of the distal phalanx laterally. Note also the square middle phalanges of the third and fourth toes.