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Objective: To get morphologic param-eters of Chinese adults through observation and measure-ment on axial laminas, to evaluate the feasibility of placing axial laminar screws and to introduce the technique.Methods: Relative parameters of 28 sets of fresh Chi-nese adults' axial specimens, including distance from the superior and inferior entry points of axial laminar screws to the superior margins of axial laminas, superior, middle, infe-rior thickness and height of the axial laminas, length and angle of the axial laminar screw trajectories, distance from the entry points of axial laminar screws to the transverse foramen and central points of the inferior articular process, were measured with a digital caliper and a goniometer.Data were statistically analyzed.Results: Averagely, distance from the superior and inferior entry points of axial laminar screws to the superior margins of axial laminas was 5 mm and 9 ram, superior, middle, inferior thickness and the height of the axial laminas were 3.2 mm, 6.7 ram, 5.5 nun and 12.8 mm respectively, and the length of the superior and inferior axial laminar screw trajectories was 26.2 mm and 25.5 mm, respectively.Conclusions: It is feasible and reliable to apply poste-rior laminar screw fixation techniques to the axes of Chinese adults.Also the C_2 laminar screw fixation technique can be taken as a supplementary to conventional posterior screw fixations of C_2.
