Experimental Model of Proximal Junctional Fracture after Multilevel Posterior Spinal Instrumentation

Figure 3

Specimen 3 after loading. Visual inspection revealed an upper endplate fracture of the supra-adjacent uninstrumented vertebra (arrow). Fracture of the upper instrumented vertebra extending to the left pedicle was also visible (oval). An axial CT scan cut of the supra-adjacent uninstrumented vertebra shows the pattern of the upper endplate fracture.