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The sacrum bone in the posterior pelvis comes from the fusing of 5 sacral vertebrae, which are numbered from superior (S1) to anterior (S5). The sacral bones fully fuse typically by around age 23, but sometimes the S1 vertebra does not fus with the others. When this happens, it's called lumbarization.

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โˆ™ 2007-09-13 11:00:59
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Q: What is lumbarization of the s1?
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