Rickets, nutritional disorder characterized by skeletal deformities. Rickets is caused by a decreased concentration of the mineral hydroxyapatite in bones and cartilage due to low levels of calcium and phosphorus in the blood. Vitamin D is essential for the maintenance of normal calcium and phosphorus levels. Classic rickets, a deficiency disease of children characterized by improper development or hardening of bones, is due to lack of sufficient vitamin D in the diet, or to insufficient ultraviolet radiation from direct sunlight, a lack that prevents conversion of the element 7-dehydrocholesterol in the skin to vitamin D. The type of skeletal deformities depends largely on the child's age when the vitamin-D deficiency occurs. A child who has not yet learned to walk develops vertebral curvatures; a walking child develops leg curvatures. "Rickets," Microsoft® Encarta® Online Encyclopedia 2000 http://encarta.msn.com © 1997-2000 Microsoft Corporation. All rights reserved.

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About Rickets
Offers a description of the malady that includes information on the causes, symptoms, diagnosis and treatment options.
eMedicine - Rickets
Laurence Finberg, MD provides a description of the condition's pathophysiology, frequency, lab and imaging studies.
NHS Choices: Rickets
Information on this rare disease that affects bone development in children including causes, symptoms, diagnosis, risks and treatment.
Rickets
Find a description of the disorder, its alternate names, the causes, incidence and risk factors.
Rickets
A description of the diagnosis and treatment of an adopted Russian child with nutritional rickets at the Alfred I. duPont Institute.
Rickets
University of Maryland Medical Center article that describes the condition. Find a discussion of causes, incidence, and risk factors.
Rickets
Mayo Clinic answers how this vitamin D deficiency effects children's bones, who is at risk, non-dietary causes, symptoms, and diagnosis. (January 12, 2005)
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