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Frontal (a) and transverse (b) view of cervical nano-hydroxyapatite/polyamide 66 cage (n-HA/PA66) (left side) and titanium mesh cage (TMC) (right side). There are several shallow recesses designed on the rims of the n-HA/PA66 cage to prevent cage translocation (a). The rims of the n-HA/PA66 cage are wider than TMC which reduce cutting of the cage into the endplates and preventing subsidence (b)
