title: Late failure of posterior fixation without bone fusion for vertebral metastases.
abstract: OBJECTIVE
  : To verify the frequency of late radiological com-plications in spinal fixation surgeries performed without fu-sion in oncological patients.
  
  
  METHODS
  : This is a retrospective analysis analysing failure in cases of non-fused vertebral fixation in an oncology reference hospital between 2009 and 2014. Failure was defined as implant loosening or bre-akage, as well as new angular or translation deformities.
  
  
  RESULTS
  : One hundred and five cases were analyzed. The most common site of primary tumor was the breast and the most common place of metastasis was the thoracic spine. The average follow-up was 22.7 months. Nine cases (8%) of failure were reported, with an average time until failure of 9.5 months. The most common failure was implant loosening. No case required further surgery.
  
  
  CONCLUSIONS
  : The occurrence of failure was not different than that reported for fused cases. The time interval until failure was higher than the median of survival of the majority (88%) of cases. Level of Evidence IV, Therapeutic Study.
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Renato Tavares
authors.initials: RT
authors.lastname: Bellato
authors.affiliation: Instituto do Câncer do Estado de São Paulo, Spine Group, São Paulo, SP, Brazil.
authors.forename: William Gemio Jacobsen
authors.initials: WG
authors.lastname: Teixeira
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Alessandro Gonzalez
authors.initials: AG
authors.lastname: Torelli
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Alexandre Fogaça
authors.initials: AF
authors.lastname: Cristante
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Tarcísio Eloy Pessoa
authors.initials: TE
authors.lastname: de Barros
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Institute of Orthopedics and Traumatology, São Paulo, SP, Brazil.
authors.forename: Olavo Pires
authors.initials: OP
authors.lastname: de Camargo
keywords: Arthrodesis; Re-trospective studies; Spinal fusion; Spinal neoplasms