Comparison of Expansive Pedicle Screw and Polymethylmethacrylate-Augmented Pedicle Screw in Osteoporotic Sheep Lumbar Vertebrae: Biomechanical and Interfacial Evaluations
Figure 2
The load-displacement curve in the axial pullout test.
On the curve, the maximum pullout strength (Fmax) was defined as the inflection point where the load peaked and then sharply decreased with the increasing displacement and energy absorbed to failure was determined as the area under the curve before the onset of failure point.