关键词: 投影角, 欧拉角, 螺旋角, 特发性脊柱侧弯, 矫形, 生物力学

Abstract:

Objective　To compare the projection angles method, the Euler angles method, the helical axis method and the tilt/twist angles method for their uses of the description of 3D spinal motion and deformity. Methods　3D Schematic diagrams of the four description methods based on precise calculation were drawn, the features of the methods are compared with their strengths, weaknesses discussed.　Results　In 3D description, the projection method has shortcomings but the Euler method and the helical axis method have superiority. The tilt/twist method is Euler method which is in special sequence but fits reality more.　Conclusions　Though the practical significance of the numerical results need further  investigation, these methods are of value to etiology, simulated surgery and robot-assisted surgery of idiopathic scoliosis.

Key words: Projection angels, Euler angles, Helical angles, Idiopathic scoliosis, Orthopaedics, Biomechanics