title: Comparison of the results from simple radiography, from before to after Salter osteotomy, in patients with Legg-Calvé-Perthes disease.
abstract: OBJECTIVE
  To determine whether the clinical variables and preoperative classification of patients with Legg-Calvé-Perthes disease (LCPD) who undergo Salter osteotomy correlate with the radiographic result at the time of skeletal maturity.
  
  
  METHODS
  In this retrospective cohort study, 47 individuals with LCPD who were treated using Salter osteotomy (1984-2004) were evaluated. The patients were evaluated according to sex, skin color, side affected and age at which osteotomy was performed. The preoperative radiographs were analyzed in accordance with the classifications of Waldenström, Catterall, Laredo and Herring. The radiographs obtained at the time of skeletal maturity were classified using the Stulberg method.
  
  
  RESULTS
  The mean age at the time of surgical treatment was 82.87 months (6.9 years). The age presented a statistically significant correlation with the Stulberg grades at skeletal maturity (p < 0.001). Patients over the age of 6.12 years tended to present less favorable results. The variables of sex, skin color and side affected did not present any statistically significant correlation with the prognosis (p = 0.425; p = 0.467; p = 0.551, respectively). Only the Laredo classification presented a statistically significant correlation with the final result given by the Stulberg classification (p = 0.001). The other classifications used (Waldenström, Catterall and Herring) did not present any correlation between the time at which surgery was indicated and the postoperative result.
  
  
  CONCLUSIONS
  The age at which the patients underwent surgical treatment and the Laredo classification groups were the only variables that presented significant correlations with the Stulberg classification.
authors.affiliation: Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Hugo Futoshi
authors.initials: HF
authors.lastname: Toma
authors.affiliation: Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Thiago
authors.initials: T
authors.lastname: de Almeida Oliveira Felippe Viana
authors.affiliation: Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Rostanda Mart
authors.initials: RM
authors.lastname: Meireles
authors.affiliation: Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Isabel Moreira
authors.initials: IM
authors.lastname: Borelli
authors.affiliation: Department of Orthopedics and Traumatology, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Francesco Camara
authors.initials: FC
authors.lastname: Blumetti
authors.affiliation: Department of Orthopedics and Traumatology, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Eduardo Shoiti
authors.initials: ES
authors.lastname: Takimoto
authors.affiliation: Department of Orthopedics and Traumatology, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Eiffel Tsuyoshi
authors.initials: ET
authors.lastname: Dobashi
keywords: Child; Classification; Legg-Calvé-Perthes disease; Radiography