title: [Effect of risk factors and therapy on intermediate-term hip deformity in Perthes disease].
abstract: The prognostication of risk factors for the outcome of LCPD was examined. The radiographic results of conservative treatment with Thomas splint and operative treatment with intertrochanteric derotational varus osteotomy (DVO) were compared using the Index of Deformity (D).
  
  
  METHODS
  Radiographs of 153 patients with unilateral LCPD were evaluated retrospectively 1.5-3 years and 3-7 years after diagnosis using the Index of Deformity and Index of Direction. We investigated the radiographic changes in relation to acetabular or metaphyseal reaction, Waldenström classification or limited range of motion at diagnosis and in dependence of therapy.
  
  
  RESULTS
  There was a significant better acetabulum-head-index of deformity after DVO. Children with metaphyseal or acetabular reaction had bigger deformities. Patients with metaphyseal reaction had smaller deformities after DVO compared with conservative treatment. Free range of motion (ROM) was prerequisite for good results after DVO. Waldenström classification at diagnosis did not have any influence on morphologic changes after 3-7 years.
  
  
  CONCLUSIONS
  DVO leads to a better containment than conservative treatment with Thomas splint, metaphyseal reaction should be an indication for operative treatment. Prerequisite for DVO is a free ROM. Because Waldenström class at diagnosis does not influence the outcome, free ROM before starting the treatment is more important than an immediate start of therapy.
authors.affiliation: Orthopädische Universitätsklinik der RWTH Aachen.
authors.forename: C
authors.initials: C
authors.lastname: Niedhart
authors.forename: M
authors.initials: M
authors.lastname: Weber
authors.forename: R
authors.initials: R
authors.lastname: Kraft
authors.forename: P
authors.initials: P
authors.lastname: Kaps
authors.forename: F U
authors.initials: FU
authors.lastname: Niethard
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007873:Legg-Calve-Perthes Disease / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D008297:Male; D010027:Osteotomy; D011183:Postoperative Complications / Q000209:etiology*; D013165:Splints; D016896:Treatment Outcome