title: Preliminary analysis on the MD-4(®) plasma-sprayed titanium acetabular component.
abstract: OBJECTIVE
  To evaluate the short-term performance of a type of implant manufactured in Brazil.
  
  
  METHODS
  This study analyzed a cohort of 60 patients who underwent implantation of MD-4(®) acetabular components during primary hip arthroplasty procedures performed between January 1, 2010, and August 1, 2012. The patients were studied retrospectively with regard to clinical behavior, stability and radiological osseointegration. The patients were followed up for a minimum of 12 months and a maximum of 42 months (mean: 27) and were evaluated by means of the Harris Hip Score, SF-36 questionnaire and serial conventional radiographs.
  
  
  RESULTS
  All the components were radiologically stable, without evidence of migration or progressive radiolucency lines. On average, the Harris Hip Score evolved from 36.1 to 92.1 (p < 0.001) and the SF-36 showed significant increases in all its domains (p < 0.001). No differences were observed among patients with osteoarthrosis, osteonecrosis, hip dysplasia or other conditions.
  
  
  CONCLUSIONS
  The short-term results showed clinical and radiological signs of stability and osseointegration of the implants, which may represent a predictive factor regarding medium-term survival of this acetabular component.
authors.affiliation: Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
authors.forename: Elmano
authors.initials: E
authors.lastname: de Araújo Loures
authors.affiliation: Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
authors.forename: Leandro Furtado
authors.initials: LF
authors.lastname: Simoni
authors.affiliation: Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
authors.forename: Isabel Cristina Gonçalves
authors.initials: IC
authors.lastname: Leite
authors.affiliation: Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
authors.forename: Daniel Naya
authors.initials: DN
authors.lastname: Loures
authors.affiliation: Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
authors.forename: Clarice Naya
authors.initials: CN
authors.lastname: Loures
keywords: Hip arthroplasty; Hip prosthesis; Osseointegration