功率调节螺钉螺纹
power adjustment screw thread
螺钉螺母调整机构
screw adjusting mechanism
内板锁紧螺钉螺纹
internal lock plate screw thread
AF椎弓根螺钉
AF pedicle screw spinal system
AF pedicle screw
AF pedicle screws
AO微型钛金属板及螺钉
AO titanium plate and screw
AO自身攻丝螺钉
AO self-tapped cortical screw