Identify the bone indicated by the arrow in the image below.

Question

BlackTom AI · Accepted Answer

Question: Identify the bone indicated by the arrow.

Option 1: Navicular — This is the bone in the midfoot on the medial side, articulating with the talus posteriorly and the three cuneiforms anteriorly. The arrow points to a bone located between the talus (posterior) and the medial cuneiforms (anterior), consistent with the navicular.

Option 2: Medial cuneiform — The medial cuneiform sits anterior to the navicular and articulates with the first (medial) metatarsal. It is typically more anterior and in line with the first metatarsal base, not the bone shown by the arrow.

Option 3: Cuboid — The cuboid is on the lateral side of the foot, articulating with the calcaneus and the fourth and fifth metatarsals. It is not located medially where the arrow is pointing.

Option 4: Calcaneus — The calcaneus is the heel bone, located posteriorly and laterally relative to the talus. It forms the subtalar joint and is not the bone in the arrowed position.

Option 5: Talus — The talus sits superior to the navicular and forms the ankle joint with the tibia and fibula. The arrowed bone is anterior to the talus, making it unlikely to be the talus itself.

Overall, the arrow points to the navicular, matching its typical position in the medial midfoot region.

Identify the bone indicated by the arrow in the image below.单项选择题

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