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What are the two balls on the sides of heels and what are their functions?

This is called the heelp fat pad, or simply heel pad, also called corpus adiposum

The fat pad of your heel, also known as the “corpus adiposum,” acts as a cushion and shock-absorber to protect your heel bone and arch. Each time you walk, run, or jump, your feet absorb and distribute your body weight combined with the force of impact–and usually, they do a great job! However, sometimes overuse, injury, or just general wear and tear can put too much pressure on different parts of the foot. Over time, the fat pad of the heel can atrophy (or shrink) in size, become worn and thin, or become inflamed and painful, resulting in heel fat pad syndrome.

The talus (ankle bone) is the second largest of the tarsal bones and sits atop the calcaneus to form the subtalar joint. The tibia and fibula adjoin it on either side to form the tibiotalar joint. The talus forms a joint with four bones: tibia, fibula, calcaneus, and navicular.

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