The disquisition pilot study about the computer assisted optimization design of a screw spring of many radices using math layout theory conjoint to computer programmer method with a exemplity.
Objective: To evaluate the accuracy of cervical pedicle screwpilot holes placement by bilateral oblique X-ray films with the spiral wires as the guide pin.
目的：探讨螺旋形导针配合双侧斜位X线片判断颈椎椎弓根螺钉置入孔道准确性的可行性。
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Methods: The pedicle screwpilot holes were drilled within the center of the pedicle, violated pedicle walls in 9 human dried thoracic vertebrae.