Figure 2

Evidence of screw loosening and pull out. CT of a 16 years old boy following segmental pedicle screw fixation T3-L2: sagittal images of one patient, (A) six weeks following surgery showing normally placed pedicle screws, and (B) two years following surgery showing evidence of pull-out at the level of T3 and T5. The image shows partly evidence of loosening and partly dorsal displacement of the screws and the rod at the upper end of the implant.