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This becomes a bone spur. When the bone spur grows out of one of the joints on the top of the midfoot, it's called a tarsal boss. A bone spur on the inside or outside any of the toes is usually referred to as a toe spur. Any factor that creates too much friction within the foot can lead to a tarsal boss or toe spur.
The talus is the most superior of the tarsal bones. It has three articulations: 1  Superiorly: Ankle joint â between the talus and the bones of the leg (the tibia and fibula). 2  Inferiorly: Subtalar joint â between the talus and calcaneus.he bones of the foot can be divided into three categories: 1  Tarsals â A set of seven irregularly shaped bones. 2  Metatarsals â These bones connect the phalanges to the tarsals. 3  Phalanges â The bones of the toes.