Many of today's medical texts tell us the coccyx fuses into one rigid segment by adulthood in most people. However, several well-designed studies have shown that a normal coccyx should have two or three movable parts that gently curve forward and slightly flex as we sit. Two medical papers (Postacchini and Massobrio1 and Kim and Suk2) found that test subjects with fused coccyxes that didn't flex upon sitting were more prone to experience tailbone pain than those with a normal coccyx.
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