The invention provides a method for a multilayer
helix CT 3D reconstruction measurement humeral head excentricity, putting the
humerus sample or the
shoulder joint sample or the
human body on the examining table. The multilayer
helix CT scanning is used to obtain the
humerus 3D reconstruction image, while the inner and external epicondyle of the
humerus is adjusted to be at the same coronal position as the normal presentation (or the superposition of the inner and external epicondyle is the
lateral position). The connecting line, wherein the
radian curvature of the humerus normal presentation (or the
lateral position)
facies articularis capituli changes most evidently, is the humeral head normal presentation (or the
lateral position)
articular facet diameter CD. The circle drawing fitting
facies articularis capituli arc line is used as the
facies articularis capituli
diameter bisecting normal EF, to line out the
diameter and the center O on the bisecting normal, obtain the humerus facies articularis capituli normal presentation (or the lateral position) center of rotation O. About the middle piece of the humerus is taken for 130 mm to seek the humerus axel wire L. The humerus center of rotation O makes the normal toward the axel wire L of the middle piece of the humerus, to obtain the excentricity OA at the inner of the humerus (or the excentricity OB at the rear side). The method can not be affected by the scanning attitude, which is a faster, simpler and more accurate method.