title: [Delay in skeletal maturity in Mexican patients with Legg-Calvé-Perthes].
abstract: OBJECTIVE
  To determine the degree of delayed skeletal maturity in patients with active Legg-Calvé-Perthes disease (LCPD) with radiographic evaluation of bone age and the degree of fragmentation of the femoral head using the modified lateral pillar Herring classification.
  
  
  METHODS
  Twenty patients with LCPD were studied with left hand and wrist anteroposterior simple X- rays to determine bone vs. chronologic age. They were also studied with anteroposterior pelvis simple X-rays to determine the modified lateral pillar Herring classification.
  
  
  RESULTS
  Seventeen (17/20) patients with LCPD presented with chronologic mean age of 8.15-years-old in comparison to mean bone age of 6.62-years-old (delay in bone age of 22.89 months). We found a delay in bone age; mean of 28 months in children 6 to 10-years-old, mean of 8 months in children 10 years and older by quadratic regression.
  
  
  CONCLUSIONS
  Previous series report patients with LCPD delayed bone age of 22 months. Our report present a series with delayed in bone age of a mean of 28 months, in children with LCPD of 6- 10-years-old.
  
  
  CONCLUSIONS
  The degree of delayed bone age in LCPD, in our Mexican population is of 28 months in children 6- 10-years-old, and only 8 months in children ten-years-old.
authors.affiliation: Hospital Shriners para Niños México, Av. Del Imán Núm. 257, Col. Santa Ursula Coapa, Delegación Coyoacán, C.P. 04650. nanzarco@hotmail.com
authors.forename: Nancy Alicia
authors.initials: NA
authors.lastname: Nava Zarco
authors.forename: Jorge
authors.initials: J
authors.lastname: Mijares Morán
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Hernández
mesh_terms: D000293:Adolescent; D000365:Age Determination by Skeleton; D001846:Bone Development; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007873:Legg-Calve-Perthes Disease / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D008297:Male; D008800:Mexico; D012189:Retrospective Studies