The center line of sacrum anteroposterior photography is

Tilt to the head side 15. According to the purpose of inquiring the anteroposterior photography of lumbosacral joint in Changbei question bank, we observed the anteroposterior photography of lumbosacral joint. The patient lay on his back on the photographic table with his knees slightly bent and his arms bent on the chest centerline, and learned that the photographic centerline of the sacrum was tilted to the head side 15.