Objective To measure anatomical parameters of Chinese proximal humerus by 3D visualization, which providing guidance for fracture reduction, internal plants placement, and internal plants design matching for Chinese patients. Methods A total of 90 patients with shoulder trauma from 2013 to 2019 were selected, they were divided into a fracture group and a normal group according to the diagnosis of proximal humeral fractures. After simulated reduction of 60 patients in the fracture group by using E-3D digital medical software, the following parameters, including the humeral head parameters of the proximal humeral bones, humeral shaft medullary cavity parameters, humeral head-stem relationship parameters, humeral heads, large or small humeral head parameters and nodules related vertical distance parameters, were measured. The parameters including head height of humeru (HH), diameter of the articular surface diameter of humeral head (ASD), radius of curvature of humeral head (ROC), neck shaft angle (NSA), medial offset (MO), posterior offset (PO), multiple level of diameter of medullary cavity of humeral shaft (L0, L20, L40) were measured together with other 30 patients in the normal group. Results HH on coronal plane and axial plane in the normal group were (15.5±2.0) mm and (15.7±2.3) mm, ASD were (42.0±3.5) mm and (40.0±3.5) mm, ROC were (22.3±2.0) mm and (20.8±1.9) mm, L0 were (26.0±3.1) mm and (23.3±2.9) mm, L20 were (15.2±2.5) mm and (13.3±2.0) mm, L40 were (12.0±2.4) mm and (10.6±2.1) mm. NSA was (132.1±4.9)° on coronal plane, MO was (4.2±1.2) mm on coronal plane, and PO was (3.4±1.4) mm on sagittal plane. There was no statistical difference in the measuring result between the fracture group and the normal group. Conclusions The method of measuring anatomical parameters of proximal humerus by 3D visualization is accurate and reliable. E-3D software has high accuracy and reliability in bone 3D reconstruction of bone, fracture simulation reduction, and parameter measurement.
Key words
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Humerus /
3D reconstruction /
Anatomical parameters /
Measurement
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