The Archives of Disease in Childhood reports that children with Prader-Willi Syndrome have a high incidence rate of scoliosis (37.5%) that increases with age.  Infants and young children had approximately a 30% rate of scoliosis and adolescents had an 80% rate of scoliosis. 

Reference:  de Lind van Wijngaarden, Roderick F.A., de Klerk, Luuk W.L., Festen, Dederieke A.M., Hokken-Koelega, Anita C.S.

Scoliosis in Prader-Willi syndrome: Prevalence, effects of age, gender, body mass index, lean body mass and genotype

Arch Dis Child 2008 0: adc.2007.123836

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