title: [Order of appearance of ossification centers in the elbow of Mexican children between 6 months and 12 years old].
abstract: BACKGROUND
  Existing data of the order of appearance of ossification centers is from Anglo-Saxon literature. This literature describes the following order of appearance of the ossification centers of the distal humerus as follows: lateral condyle appears before one year of age, but it might delay up to 18-24 months; medial epicondyle between 5 to 6 years of age; the medal condyle between 9 to 10 years of age; the lateral epicondyle is the last one to ossify, between 10 to 12 years of age. Proximal radius ossifies between 3.8 and 4.5 years; olecranon at 6 to 8 years of age.
  
  
  METHODS
  We studied 240 elbows and classified them in 6 groups according to the age of appearance of ossification centers. Anteroposterior and lateral radiographs were taken, and analyzed.
  
  
  RESULTS
  We found a delay in the manifestation of the olecranon and the medial epicondyle. In base of our clinical observations, the ossification centers present later in Mexican children.
authors.affiliation: Cirujano Ortopedista, Hospital ABC, DF México. carlosprocell@hotmail.com
authors.forename: Carlos R
authors.initials: CR
authors.lastname: Procell Villalobos
authors.forename: Nelson
authors.initials: N
authors.lastname: Cassis Zacarías
authors.forename: Carlos S
authors.initials: CS
authors.lastname: Juárez Rojas
authors.forename: Martha Beatríz
authors.initials: MB
authors.lastname: Cárdenas Turrent
mesh_terms: D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D004550:Elbow / Q000254:growth & development*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008800:Mexico; D010012:Osteogenesis; D012016:Reference Values