Fig. 1

The design of the novel growth guidance system. Figure 1a shows the UHMWPE gasket. Figure 1b shows the UHMWPE gasket can be perfectly fitted into the tulip of the sliding screw and locked by the nut. Figure 1c shows the longitudinal section of the sliding screw with gasket assembled. Figure 1d shows the rod, the sliding part of the rod was polished, the middle part of the rod was un-polished