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Figure 8a. Utility of multidetector CT in evaluation of nonunion. (a) Anteroposterior radiograph demonstrates multilevel pedicle screw and rod instrumentation with a corpectomy at L3 and reconstruction with a humeral strut graft and lateral side-plate and screws. Areas of lucency around the inferior pedicle screws are indicative of loosening (arrowheads). (b) Coronal CT image clearly shows areas of lucency around the inferior pedicle screws (arrows). (c) Coronal CT image in a more posterior plane than b demonstrates the dense, granular appearance of the graft material (arrows), a finding indicative of a lack of graft incorporation into a solid fusion construct at this inferior level. (d) Coronal CT image in a more posterior plane than b and c shows adequate formation of a posterolateral osseous fusion complex at higher levels (arrows).
