Methods for determining the pedicle base circumference and the pedicle isthmus for enabling optimum screw or instrument placement in a pedicle of a vertebral body during spinal surgery

摘要

round the vertebral spine surgery on yo vertebral screws in place a pyramidal base required to facilitate the perimeter, and A method for determining the yaw vertebral isthmus comprises the steps of providing a set of a first line tangent to the outer skin surface of the vertebral bodies near the required cross-section and from the three-dimensional image of a vertebral body on the vertebral body, the series of the first line and perpendicular to, the yaw vertebral providing a set of second lines extending through the near and the vertebral body, adjacent the region of the outer skin surface with a maximum angle formed between the second line is required around the cone base (pedicle base circumference) defined by the steps of: , and a region corresponding to the outer region of the skin surface in the second line is parallel close to each other comprises the steps required to define the isthmus la vertebrae. The center of the yo vertebral isthmus is defined in cross-section formed by the intersection of the two lines extracted from the center of the second fine vertical line extended from the outer skin surface.