Patent ID: 8460310

Claim:
An apparatus for exerting force on a bone with respect to a fulcrum, the apparatus comprising: a. a base structure, adapted for mechanical coupling to the fulcrum and exerting both transverse and axial force on the bone relative to the fulcrum with respect to a pedicle screw; b. a leg extension coupled to the base structure via a rotatable coupling, the leg extension, in turn, directly coupled to a closure top threaded for retention of a transverse rod in a corresponding helically-threaded head of a pedicle screw, the pedicle screw characterized by a pedicle screw axis and adapted for insertion into the bone; whereby rotation of the leg extension urges the closure top into the helically-threaded head of the pedicle screw in such a manner as to tighten the transverse rod with respect to the pedicle screw.