title: Mechanical analysis of femoral neck fracture fixation with dynamic condylar screw in synthetic bone.
abstract: OBJECTIVE
  To analyze statistically results in biomechanical testing of fixation of femoral neck Pauwels type III fractures, on synthetic bone, with dynamic condylar screw (DCS) and control group.
  
  
  METHODS
  Ten synthetic bones of a national brand were used. Test Group: fixation was performed after osteotomy at 70(o) tilt using DCS plate with four holes. We analyzed the resistance of this fixation with 5 mm displacement and rotational deviation (Step 1) and with10 mm (Step 2).
  
  
  METHODS
  the models were tested in their integrity until the femoral neck fracture occurred.
  
  
  RESULTS
  The values of the test group in Step 1 showed a mean of 974N and SD = 114N. In Stage 2, we obtained on average 1335N and SD = 98N. The values in the control group were: 1544N, 1110N, 1359N, 1194N, 1437N, respectively. Statistical analysis using the Mann-Whitney test for comparison of the maximum force (N) between the test group and the control, in Step 2, demonstrated that there is no significant difference between the DCS and control plates (p = 0.91).
  
  
  CONCLUSIONS
  There is no significant difference between the DCS boards and the control group exposed to full resistance. Level of Evidence III, Case Control.
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: 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: Renato De Almeida
authors.initials: Rde A
authors.lastname: Lima
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: Marcelo De Almeida
authors.initials: Mde A
authors.lastname: Ferrer
keywords: Biomechanical phenomena; Femoral neck fractures; Internal fixators