PMC4891402_01
A. AP radiograph demonstrates new spinal hardware between L2 and L5 and old spinal hardware between L4 and S1 with no abnormalities. Posterior spinal bone graft is in expected position. B. AP radiograph obtained 2 weeks later demonstrates that the morselized bone and Osteoset  mixture on both sides of the spine has moved laterally and is now much less distinct. [PowerPoint Slide]
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Immediate postoperative radiographs showed the new L2-L5 pedicle screws and rods, the prior L4-S1 distraction rods, and the mixture of bone graft and Osteoset  in expected position without complications (Figure 1A). These findings were thought to reflect a seroma or possibly hematoma (Figure 1B).