Thin, on the outside of the calf. The enlarged upper end is called fibular capitulum, and there is a joint above it connected with the fibular articular surface of tibia. The swelling of the lower end is called lateral ankle, and its inner side has a flat lateral ankle surface, which participates in the formation of ankle joint. This bone is slender and plays an auxiliary and supporting role.
Introduction of fibula:
1, fibula position is correct. On the fibula slice, the fibula capitulum overlaps with the lower part of the lateral condyle of tibia. The upper end of the fibula capitulum protrudes upward, which is called fibula styloid process.
The fibular shaft is particularly slender, showing a typical tubular bone shadow. The lateral cortex is thicker and the medial cortex is thinner, sometimes with marginal density, which is the shadow of interosseous ridge.
The lower end of the fibula forms the lateral ankle, which is triangular with the tip pointing downwards, and its inner surface corresponds to the talus pulley, which participates in the formation of the ankle joint. At the lower end of the lateral malleolus, there is sometimes a groove shadow of optical density, which is the lateral malleolus groove. Above the lateral ankle, the fibula overlaps or corresponds to the lower end of the tibia, leaving a gap.
2. Lateral position of fibula. The front part of the fibula capitulum overlaps the tibia, and the fibula shaft is a typical long tubular bone. The lateral ankle enters the talus trochlear shadow downward through the ankle joint space. In the shadow overlapping the talus trochlea, the medial malleolus is in front and the lateral malleolus is in the back.
Fibula:
1, medial tibial condyle. 2. Lateral condyle of tibia. 3, fibular head. 4. Interosseous crest of tibia. 5, medial malleolus. 6. lateral malleolus.