4. Metacarpal Sesamoid Bones
A few metacarpal sesamoid bones are located in the joints of certain fingers. Their number depends on a variety of factors, including gender and ethnicity. Studies show nearly all people have a sesamoid bone in the thumb, but only sixty percent have them in the index and small fingers. Between 13 and 18 percent have one in the interphalageal joint, and fewer than five percent have one in the middle and ring fingers.
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