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Letters to the editor
Perthes' disease and blood manganese levels
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Editor,—Children with Perthes' disease have aseptic necrosis of the hip and a selective impairment of growth. Trace metal deficiency in chickens leads to a similar condition, and in 1989 Hall et al reported low blood manganese levels in 27 children with this disease.1 With consent from the ethical committee of the same hospital as in their study, we have measured blood Mn of a further group of Perthes' patients, and control patients with minor musculoskeletal trauma matched for age and sex. Blood was drawn …