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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 main problems encountered in the tarsal joints are arthritis and post-traumatic pain and instability. Arthritis. The subtalar and talonavicular joints are frequently affected by rheumatoid arthritis, leading to a flatfoot deformity as the static restraints are overcome by the forces of gait (Keenan 1990). Lesser tarsal joints may also be affected by RA and this may contribute to flatfoot in some patients.