Ranges of motion (ROM) and neutral zone (NZ) profiles of the C2 to C4 segments of the control group in in vivo implantation, the ACVC in vitro implantation group and the ACVC in vivo implantation group before the fatigue test in all directions.

aPbPThe control group in in vitro implantation is similar to the control group in in vivo implantation. The data for the control group in in vitro implantation are not shown in the table below. The data from before and after the fatigue test were not significantly different, and the data for these groups after the fatigue test are not shown in the table below.