Department of Orthopedic Surgery, College of Medicine, Eunpyeong St. Mary's Hospital, The Catholic University of Korea, 1021 Tongil-ro, Eunpyeong-gu, Seoul, 03312, Republic of Korea.
College of Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
Arch Orthop Trauma Surg. 2022 Feb;142(2):219-226. doi: 10.1007/s00402-020-03676-0. Epub 2020 Nov 10.
We compared the angle of the humerus and plate and to assess compatibility of a plate to the proximal humerus using three-dimensional (3D) printed models.
A total of 120 cases were included, who underwent anteroposterior shoulder radiographs. From these, 30 cases with 3D shoulder computed tomography scans were randomly selected to print 3D model. The lateral angle between the lateral cortex of the humeral shaft and lateral border of the greater tuberosity (GT), neck-shaft angle, and height from the most proximal point of the GT to the angular point were measured. When the plates were applied on the 3D models, the gap from the most proximal point of the GT to the proximal rim of the plate was measured.
The mean lateral angle in plain radiographs was 12.9 ± 2.2° and height from the most proximal point of the GT to the angular point was 44.4 ± 4.7 mm. The bending angles of the three plates were 8° and 10°. Height from the proximal rim of the plate to the bending point was 42.4, 42.0 and 43.8 mm. In 98% of cases, the lateral angle of the humerus was larger than all three plates. In 43% of cases, height of the GT was smaller than height of plates. When plates were applied to the 3D model, the mean gap from GT to plate was 4.8 ± 2.8 mm.
There was large variation in the lateral angle of the proximal humerus, which was not correlated with the neck-shaft angle. The lateral angle of the humerus was larger than the plates and prone to varus reduction and medial collapse.
Basic science study.
我们比较了肱骨和钢板的角度，并用三维（3D）打印模型评估了钢板与肱骨近端的兼容性。
共纳入 120 例接受前后位肩部 X 线检查的患者。从这些患者中，随机选择 30 例具有 3D 肩部 CT 扫描的患者进行 3D 模型打印。测量肱骨骨干外侧皮质与大结节外侧缘之间的外侧角（GT）、颈干角和 GT 最近端至角点的高度。当将钢板应用于 3D 模型时，测量 GT 最近端至钢板近端边缘的间隙。
平片的平均外侧角为 12.9±2.2°，GT 最近端至角点的高度为 44.4±4.7mm。三种钢板的弯曲角度为 8°和 10°。从钢板近端边缘到弯曲点的高度分别为 42.4、42.0 和 43.8mm。在 98%的病例中，肱骨的外侧角大于所有三种钢板。在 43%的病例中，GT 的高度小于钢板的高度。当钢板应用于 3D 模型时，GT 到钢板的平均间隙为 4.8±2.8mm。
肱骨近端外侧角存在较大差异，与颈干角无相关性。肱骨外侧角大于钢板，容易发生内翻复位和内侧塌陷。
基础科学研究。
