Testing stiffness and yield strength of clavicular fracture fixation devices.
The purpose of this project was to determine the stiffness and
yield strength of five bone plates, devices used in surgery to heal
fractured clavicles. Six samples of five devices (2.7 DC, 3.5 DC, 3.5
LDC, 3.5 Recon, and 3.5 CRecon) were tested in the Instron 8874 Biaxial Mechanical Testing System in both cantilever bending and torsion. Two
plates showed significantly lower stiffness values than the other
plates. 3.5 Recon showed the lowest bending stiffness value at 11.123
N/mm, while 2.7 DC showed the second lowest value at 14.132 N/mm. 2.7 DC
showed the lowest torsional stiffness value at 0.251 N-mm/ degree, while
3.7 Recon showed the second lowest value at 0.312 N-mm/degree. Clinical
studies will determine whether the lower or the higher stiffness values
function better in the body.