Objective:To investigate the concave angle of vertebral end-plate in low lumbar spine, and the changes of the angle during lumbar disc degeneration.
目的：研究下腰椎椎体终板的凹陷角以及它在腰椎间盘退变时的变化规律。
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This paper presents an approach to machine steam turbine blades in 5-axis NC. By means of using a disc cutter with a concave end, curvature fitting is used to machine the convex and concave surface.