Design for movable or hybrid assembly allowing the transmission of physiological stresses in pathologies implying a lesser degree of cervical instability. Special conical profile that decreases the load in the screw's base. Blunt point to assure that the posterior cortical is not perforated. Torque-limiting blocking system. Non profile-increasing blocking system (without covers). Simple removal of the screw in case of mistake or reoperation. Blue colour code.
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