Static load test of the modified sliding hip screw: the DHS-AF®.
OBJECTIVE
To analyze the in vitro mechanical strength of the DHS-AF(®).


METHODS
We evaluated the in vitro resistance of a sliding bolt modified by the addition of a connector system, DHS-AF(®).


RESULTS
The changes performed by the authors allow the exchange by the surgeon of the sliding bolt without the need to remove the plate and disassemble the entire device to reposition it properly. We conducted a static bending test to evaluate maximum strength, stiffness and ductility of the system. DHS-AF(®) showed satisfactory mechanical properties when compared to other conventional devices which use the same principle.


CONCLUSIONS
Based on these results, the authors propose the use of this new implant in further in vivo studies. Level of Evidence III, Analytical Study.
Orthopedics and Traumatology Service, Hospital Regional do Gama do Distrito Federal (HRG-DF), Brasília, DF, Brazil.
Anderson
A
Freitas
Orthopedics and Traumatology Service, Hospital Regional do Gama do Distrito Federal (HRG-DF), Brasília, DF, Brazil.
Hélio Ismael
HI
da Costa
Orthopedics and Traumatology Service, Hospital Regional do Gama do Distrito Federal (HRG-DF), Brasília, DF, Brazil.
Célio José
CJ
Silva
Orthopedics and Traumatology Service, Hospital Regional do Gama do Distrito Federal (HRG-DF), Brasília, DF, Brazil.
Carlos Henrique da Costa
CH
Rangel
Bone screws; Evaluation; Hip fractures