Fig. 4.

Lateral plain films of a 77-year-old man with an L1 compression fracture. a Immediate postoperative lateral plain X-ray. b Twelve months after the vertebroplasty, recollapse occurred and the injected CaP was partially reabsorbed. c Twenty-seven months after the vertebroplasty, he presented with back pain after a fall. Lateral plain X-ray showed that the CaP-augmented L1 vertebral body was more compressed than the immediately postoperative and follow-up X-rays, and the solid hump of the CaP cement was fractured as well (arrow)