on the shape and function of the external reconstruction plate 10 the disclosed positions are not restricted for the invention fig4 shows the cross sectional view of the external reconstruction plate of another preferred embodiment of the present invention the only difference between the fig3 and fig4 is that the number and location of the locking portions 13 of the external reconstruction plate 10 as shown in fig5 9 and 10 the connection member 20 and the connection with other parts are disclosed wherein the connection member 20 is a ring shaped member and has an outer threaded section 21 and a polygonal section 22 the connection member 20 has an inner threaded hole 23 and a reception hole 24 which communicates with the inner threaded hole 23 of the connection member 20 the top end diameter 241 of the reception hole 24 of the connection member 20 is larger than the bottom end diameter 242 of the reception hole 24 of the connection member 20 the inner wall 243 that is located adjacent to the top end diameter 241 is a vertical wall the reception hole 24 has a concaved and curved inner wall 244 which is located adjacent to the bottom end diameter 242 the connection member 20 can be rotated by using a tool not shown to operate the polygonal section 22 the outer threaded section 21 is threadedly connected with the inner threaded hole 13 of the locking portion 13 of the external reconstruction plate 10 fig6 9 and 10 disclose the screw 30 which has a shank 31 with outer threads the lower end of the shank 31 is a self tapping end.