Author/Authors :
Mansur, Henrique Hospital de Força Aérea de Brasília, Brasília, DF, Brazil , alvarez, rafael Hospital de Força Aérea de Brasília, Brasília, DF, Brazil , freitas, derson Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil , Gonçalves, Cesar BarBosa Hospital Naval Marcílio Dias, Rio de Janeiro, RJ, Brazil , roGerio freitas raMos, Max Universidade Federal do Estado do Rio de Janeiro, RJ, Brazil
Abstract :
Objectives: To analyze the results of biomechanical assays of the
fixation of Pauwels type II femoral neck fractures in synthetic bones,
using two parallel cannulated screws or three cannulated screws
in an inverted pyramid formation. Methods: Ten Brazilian-made
synthetic bones were divided into 2 groups. Groups A and B utilized
three and two cannulated screws, respectively, after osteotomy
in the middle third of the femur, perpendicular to the axis of the
femoral neck, simulating a Pauwels type II femoral neck fracture.
The resistance of these fixations was analyzed by compression
on the axis of the force resulting from hip compression, simulated
with a manual hydraulic press. The T-test and post hoc analysis
were used to compare the groups, and the significance criterion
adopted was p < 0.05. Results: In group A, which used fixation
with three screws, synthesis failure was seen at a mean force of
526 N. In group B, which used two screws, the mean force was
466 N. The results presented a statistically significant difference
(p = 0.02). Conclusion: The osteosynthesis of femoral neck
fractures in synthetic bone fixated with two screws presented
inferior results to fixation with three screws. Level of Evidence
III; Case-control study
