Osteosynthesis system for joining bone portions, has screw part with osseous threading, where value of diameter of osseous threading at bottom of thread is less than value of one diameter of internal thread in plate

摘要

The system has a pedicular screw (100) including parts (110, 120) with osseous threadings (112, 122), whose diameters at a top of threads (113, 123) have values (A, B), respectively. A diameter of the threading (122) at a bottom of thread (123) has a value (C). A part (130) has a rod portion (131), whose section has a value (D). The screw joins with a plate (10) by a hole (11), whose section has a value (E). The plate has an internal thread (13) with diameters equal to values (F, G). The values (A, C, D) = value (G). The values (B, F) = value (E). The value (B) = value (F) and = value (G).