Biomechanical analysis of the FlatWire Figure 8 sternal fixation device

To determine whether the FlatWire Figure 8 sternal fixation device (Penn United, USA) is mechanically superior to the current standard in sternotomy closure.

Unstable sternal closure using traditional steel-wire cerclage can increase postoperative pain, bony cut-through and wound dehiscence. The authors present the Figure 8 sternal fixation device to minimize these complications. Biomechanical properties of the device were compared with conventional steel wire sternal repair.

Using two constructs of both FlatWire and steel wire, pull-to-failure, Hertzian contact and cut-through were compared. Samples were tested to 500,000 cycles or failure. Cyclic comparisons were performed using log-rank t tests and Student's t tests for cut-through analysis. FlatWires were found to have superior biomechanical properties in all categories tested.

The FlatWire provides superior biomechanical properties compared with conventional steel wire, which may lead to reduced sternal wound complications.