Method for multi-layer spiral CT three-dimensional rebuilding measuring humeral head eccentricity

Abstract

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.

Description

technical field [0001] The invention relates to a method for measuring humeral head eccentricity in orthopedic anatomy and orthopedic clinical medicine, in particular to a method for measuring humeral head eccentricity by using multi-slice spiral CT (multi-slice CT, MSCT) three-dimensional reconstruction. Background technique [0002] The so-called humeral head eccentricity (offset) means that the center of rotation of the head determined by the articular surface of the humeral head is eccentric backward and inward relative to the central axis of the humeral shaft. The eccentric distance (medial offset), the eccentric distance to the rear side. Humeral head eccentricity is one of the core indicators of shoulder joint prosthesis design, prosthesis selection and shoulder joint reconstruction surgery, and has very important clinical significance. Existing measurement methods include direct anatomical measurement, X-ray plain film measurement, three-dimensional method measureme...

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Problems solved by technology

[Robertson DD, YuanJ, Bigliani LU, et al.Three-dimensional analysis of the proximal part of thehumerus: relevance to arthritis[J].J Bone Joint Surg(Am).2000,82(11):1594-1602.] Robertson et al. used CT and three-dimensional computer models to measure the medial eccentricity of 60 specimens, indicating that the center of rotation of the humeral head and the center of the humeral shaft were obtained by the least square method, but it was still difficult to observe the center of the humeral shaft in the upper view pictures provided.

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