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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.
Relevant Anatomy. A plantar or dorsally displaced metatarsal alters the pressure pattern in the forefoot, and an IPK can form in the area of increased pressure. Typically, this is beneath one of the lesser metatarsal heads and can be exacerbated by a hammertoe deformity or hypertrophic metatarsal condyles.