This invention proposes a system (100) for the insertion and removal of a so-called “locator” pin (110) for very precisely positioning a pedicle screw (170) in a bone (O), enabling the implementation of an affordable and safe procedure that reduces exposure to surgery.According to the invention, the system comprises:a locator-pin (110) comprising a pin body (112), a distal portion (114) shaped so as to penetrate a bone； and a proximal portion (116) equipped with: a first fixing member (118) to fix, during use, to an insertion pin-carrier (120)； anda second fixing member (119) to fix, during use, to a removal pin-carrier (130)；the two fixing members (118, 119) being different；an insertion pin-carrier (120) equipped with a fixing member (121) complementary to the first fixing member (118) of the locator-pin；a removal pin-carrier equipped with a fixing member (131) complementary to the second fixing member (119) of the locator-pin； anda guide cannula (140) designed to receive freely sliding the locator-pin (110), the insertion pin-carrier (120) and the removal pin-carrier (130).
