![]() Runners, dancers and athletes get it from over-practicing movements that transfer weight to the ball of the foot. Sesamoiditis is usually caused by overuse of the tendons that interact with the sesamoid bones in the foot. The sesamoid closer to the middle of the foot, the medial sesamoid, bears more of this stress and is more often affected, but the tibial sesamoid can be affected too. These bones bear the additional stress of shock absorption from walking. Sesamoid bones exist in the feet, hands and knees, but sesamoiditis always refers to the foot bones. They interact with the tendons as they move and are subject to the same stress from the same movements. While most bones in the body are connected to other bones, sesamoid bones are unique in that they are only connected to tendons. ![]() Activities that frequently transfer weight to the ball of the foot - including running, dancing and walking in high heels - can overstress these tendons and bones, causing inflammation and pain. The two pea-sized sesamoid bones sit under the big toe joint, where they provide leverage when the tendons load weight onto the ball of the foot. ![]() Because the tendons in the ball of the foot have small sesamoid bones embedded in them, these bones can become inflamed along with the tendons. Sesamoiditis is a specific kind of tendonitis - inflammation of the tendons - that occurs in the ball of the foot. ![]()
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