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Sesamoiditis
There are a few bones in the human body that are connected only to tendons or are embedded in muscle. These are the sesamoids. Two very small sesamoids (about the size of a kernel of corn) are found in the underside of the forefoot near the great toe - one on the outer side of the foot and the other closer to the middle of the foot.
Sesamoids provide a smooth surface over which the tendons slide, thus increasing the ability of the tendons to transmit muscle forces. The sesamoids in the forefoot also assist with weight-bearing and help elevate the bones of the great toe. Like other bones, sesamoids can fracture. Additionally, the tendons surrounding the sesamoids can become irritated or inflamed. This is called sesamoiditis and is a form of tendonitis, and is common among ballet dancers, runners and baseball catchers.
Symptoms include: