Final answer:
The structural type of joint at the distal tibia and fibula is a syndesmosis. It is formed by the interosseous membrane and ligaments at the distal tibiofibular joint and prevents separation between the bones.
Step-by-step explanation:
The structural type of joint at the distal tibia and fibula is a syndesmosis. Above the ankle, the distal ends of the tibia and fibula are united by a strong syndesmosis formed by the interosseous membrane and ligaments at the distal tibiofibular joint. These connections prevent separation between the distal ends of the tibia and fibula and maintain the talus locked into position between the medial malleolus and lateral malleolus.