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Rickets is a childhood disorder involving softening and weakening of the bones. It is primarily caused by lack of vitamin D, calcium, or phosphate.
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Rickets was once considered an extremely common disorder of childhood. The term itself is derived from the old English word for " twist, " or " wrick, " and throughout history children with rickets could be identified by their bowed legs and knock knees, which gave them a twisted appearance.
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