title: Analysis of mechanical strength to fixing the femoral neck fracture in synthetic bone type Asnis.
abstract: OBJECTIVE
  To analyze the results of biomechanical assays of fixation of Pauwels type III femoral neck fracture in synthetic bone, using 7.5mm cannulated screws in inverted triangle formation, in relation to the control group.
  
  
  METHODS
  TEN SYNTHETIC BONES WERE USED, FROM A DOMESTIC BRAND, DIVIDED INTO TWO GROUPS: test and control. In the test group, a 70° tilt osteotomy of the femoral neck was fixated using three cannulated screws in inverted triangle formation. The resistance of this fixation and its rotational deviation were analyzed at 5mm displacement (phase 1) and 10mm displacement (phase 2). The control group was tested in its integrity until the fracture of the femoral neck occurred. The Mann-Whitney test was used for group analysis and comparison.
  
  
  RESULTS
  The values in the test group in phase 1, in samples 1-5, showed a mean of 579N and SD =77N. Rotational deviations showed a mean of 3.33°, SD = 2.63°. In phase 2, the mean was 696N and SD =106N. The values of the maximum load in the control group had a mean of 1329N and SD=177N.
  
  
  CONCLUSIONS
  The analysis of mechanical strength between the groups determined a statistically significant lower value in the test group. Level of Evidence III, Control Case.
authors.affiliation: Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.
authors.forename: Anderson
authors.initials: A
authors.lastname: Freitas
authors.affiliation: Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.
authors.forename: Welder Fernandes
authors.initials: WF
authors.lastname: Lula
authors.affiliation: Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.
authors.forename: Jonathan Sampaio
authors.initials: JS
authors.lastname: de Oliveira
authors.affiliation: Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.
authors.forename: Rafael Almeida
authors.initials: RA
authors.lastname: Maciel
authors.affiliation: Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.
authors.forename: Diogo Ranier de Macedo
authors.initials: DR
authors.lastname: Souto
authors.affiliation: Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.
authors.forename: Patrick Fernandes
authors.initials: PF
authors.lastname: Godinho
keywords: Biomechanical phenomena; Femoral neck fractures; Fracture fixation, internal