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Lateral plain films of a 57-year-old man with an L1 compression fracture. a Initially, the L1 vertebral body was compressed. b Immediate postoperative lateral plain X-ray showed well-deposited CaP cement. c Twelve months after the vertebroplasty, recollapse and heterotopic ossification occurred (arrow), and the injected CaP was reabsorbed. d Twenty-four months after the vertebroplasty, the heterotopic ossification was condensed and osteogenesis had developed in the vertebral body
