title: UNCEMENTED ARTHROPLASTY AFTER HIP METASTATIC DISEASE AND MULTIPLE MYELOMA.
abstract: OBJECTIVE
  To describe a case series using a combination of narrative, graphical exploratory analysis and Bayesian Network modeling.
  
  
  METHODS
  Case series with 34 patients undergoing uncemented and hybrid arthroplasty procedures secondary to hip pain or fracture secondary to metastatic disease or multiple myeloma.
  
  
  RESULTS
  The most common tumors included gastrointestinal, multiple myeloma and breast cancer. Most devices were total arthroplasty (n = 16, 84.2%) rather than partial and uncemented arthroplasty (n = 12, 63.2%) rather than hybrid. The average time between surgery and deambulation was 20 days, the average length of hospital stay was 13 days, and the average patient survival was 589 days. Only one infection was reported. Uncemented and hybrid arthroplasty devices did not differ regarding time to walk, as well as the length of hospital stay in this sample.
  
  
  CONCLUSIONS
  Our model may be used as a prior for the addition of subsequent patient samples, personalizing, thus, its recommendations to other patient populations.Level of Evidence IV, Case series.
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: André Mathias
authors.initials: AM
authors.lastname: Baptista
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Sergio Pinheiro de Souza
authors.initials: SP
authors.lastname: Meirelles
authors.affiliation: . Instituto do Câncer do Estado de São Paulo (ICESP), São Paulo, SP, Brazil.
authors.forename: Daniel César Seguel
authors.initials: DC
authors.lastname: Rebolledo
authors.affiliation: . Instituto do Câncer do Estado de São Paulo (ICESP), São Paulo, SP, Brazil.
authors.forename: Luiz Filipe Marques
authors.initials: LF
authors.lastname: Correia
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Olavo Pires
authors.initials: OP
authors.lastname: de Camargo
keywords: Arthroplasty; hip. Neoplasm metastasis. Bone neoplasms; replacement