Problem: Unnatural Foot Position Ultra-high heels force the feet into a position that puts stress on the ball of the foot. At this critical joint, the long metatarsal bones meet the pea-shaped sesamoid bones, and the toe bones (phalanges). Too much pressure can inflame these bones or the nerves that surround them. Chronic stress to the foot bones can even lead to hairline fractures.
In the foot - the first metatarsal bone usually has two sesamoid bones at its connection to the big toe (both within the tendon of flexor hallucis brevis). In some people, only a single sesamoid is found on the first MCP. I have 3 on one foot two on the other.