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a, b Six-year-old male with Hurlers disease and cranio-cervical stenosis with myelopathy. The dynamic fluoroscopy 4 months after posterior C1–C2 decompression and in situ fusion with AICBG showed atlanto-axial instability. c Solid fusion 12 weeks after revision surgery including posterior rhBMP-2 application and repeat AICBG, evidenced on dynamic fluoroscopy. AICBG autologous iliac crest bone grafting
