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It is defined by the nonfusion of the first and second segments of the sacrum.
en.wikipedia.org He was hospitalised for two years, requiring 17 operations including the insertion of an artificial sacrum and the contraction of his leg by 5 cm.
en.wikipedia.org Similarly, the sacrum is usually counted as a single bone, rather than five fused vertebrae.
en.wikipedia.org Sacrum of more than two vertebrae; trunk-vertebrae amphicoelian; limbs ambulatory.
en.wikipedia.org The five sacral vertebrae have not yet fused into a real sacrum.
en.wikipedia.org