title: Blount disease in a case of Prader-Willi syndrome: why is it not as prevalent as in obesity without Prader-Willi syndrome?
abstract: BACKGROUND
  Prader-Willi syndrome (PWS) is a genetic disorder causing multisystem abnormalities with obesity. Obesity is a well established cause of Blount disease.
  
  
  METHODS
  A 7-year-old girl with PWS presented with genu varum of the left knee with deformity of the proximal medial tibial condyle, which was consistent with Blount disease.
  
  
  RESULTS
  A lateral physeal stapling and subsequent osteotomy for the left proximal tibia and fibula were performed with improved anatomical alignment.
  
  
  CONCLUSIONS
  Blount disease has not been reported in the literature in association with PWS despite excessive obesity.
authors.affiliation: Department of Radiology, Penn State/Milton S. Hershey Medical Center, 500 University Drive, Hershey, PA 17036, USA. sdulka@hmc.psu.edu
authors.forename: Susan
authors.initials: S
authors.lastname: Dulka
authors.forename: Arabinda Kumar
authors.initials: AK
authors.lastname: Choudhary
authors.forename: Sosamma
authors.initials: S
authors.lastname: Methratta
authors.forename: Kristine
authors.initials: K
authors.lastname: Fortuna
mesh_terms: D001848:Bone Diseases, Developmental / Q000453:epidemiology* / Q000209:etiology*; D002648:Child; D005260:Female; D006801:Humans; D009765:Obesity / Q000150:complications*; D055034:Osteochondrosis / Q000151:congenital* / Q000453:epidemiology / Q000209:etiology; D011218:Prader-Willi Syndrome / Q000150:complications*; D015995:Prevalence