Illustrated Encyclopedia of Human Anatomic Variation: Opus V: Skeletal Systems

Ankle and Foot, Part 1 of 8

Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed

Figure 1:Trigonum

1. Calcaneus, dorsal view; x special fasette for trigonum
2. Talus with trigonum in-situ, dorsal view
3. Trigonum, from below; x coalescence surface for the talus and joint surface for the calcaneus.

Figure 2:Trigonum

1. Right, separate
2. Left fused with talus
3. Left talus with trigonum from below

Figure 3:Trigonum fused with talus. Dorsal view.

Figure 4:Trigonum

1. Right with fused talus
2. left in-situ, fused
3. Plantar view of b

Figure 5:Trigonum in position, not fused.

1. Right. Indication of two parts
2. Left not divided

   Talus, trig. = trigonum
   Calc. = calcaneus in-situ, dorsal view

Figure 6:Trigonum with talus and calcaneus in-situ, dorsal view.

Figure 7:Trigonum fused with the talus.

1. Talus, trigonium and calcaneus in-situ. Dorsal view.
2. Talus with trigonum, plantar view.

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