Glasson Jean-Marc, van Rooij Floris, Nover Luca, Saffarini Mo, Kany Jean
Clinique Saint François, ELSAN, 22 Avenue Marcel Lemoine, 36000, Châteauroux, France.
Clinique du Parc Imperial, 28 Boulevard du Tzarewitch, 06000, Nice, France.
J Exp Orthop. 2022 May 18;9(1):46. doi: 10.1186/s40634-022-00481-z.
To determine the reliability of anatomic references for mediolateral component positioning in shoulder arthroplasty.
The computed tomography scans of 86 shoulders free of arthritic or anatomic deformities were studied. Two surgeons independently digitized a series of points, including the intersection of the 3 bone branches of the scapular spine (Y), the center of the glenoid surface (G), the most medial point of the scapula (MS), the cortical convergence (CC) of the anterior and posterior margins of the glenoid, the base of the coracoid (BC), the anterior (HA) and posterior (HP) margins of the subchondral bone.
The mean mediolateral distances between G and Y, BC, CC were respectively - 19.6 mm, - 1.5 mm, and - 36.8 mm. The consistency of anatomic landmarks was greatest for Y (standard deviation (SD) =2.3 mm; interquartile range (IQR) =3 mm), compared to BC (SD = 4.6 mm; IQR = 7 mm), and CC (SD = 6.6 mm; IQR = 8 mm). The repeatability of anatomic landmarks was excellent for all measurements. The mean ratios (relative to humeral head size) of distances between G and Y, BC, CC were respectively - 0.45, - 0.04, and - 0.85. The consistency of ratios was greatest for Y (SD = 0.05; IQR = 0.06), compared to BC (SD = 0.11; IQR = 0.14), and CC (SD = 0.13; IQR = 0.17). The repeatability of ratios was excellent for Y and BC, while it was good for CC.
The Y-plane is a reliable reference for glenoid component positioning in shoulder arthroplasty, with a consistent distance from the center of the glenoid surface, and could therefore be suitable for preoperative planning.
Level III, comparative anatomic study.
确定肩关节置换术中用于确定中外侧组件位置的解剖学参考标志的可靠性。
研究了86例无关节炎或解剖畸形的肩部的计算机断层扫描图像。两名外科医生独立数字化一系列点，包括肩胛冈的3个骨分支的交点（Y）、关节盂表面中心（G）、肩胛骨最内侧点（MS）、关节盂前后缘的皮质汇聚点（CC）、喙突基部（BC）、软骨下骨的前缘（HA）和后缘（HP）。
G与Y、BC、CC之间的平均中外侧距离分别为-19.6mm、-1.5mm和-36.8mm。Y的解剖标志一致性最大（标准差（SD）=2.3mm；四分位数间距（IQR）=3mm），相比之下，BC的一致性为（SD = 4.6mm；IQR = 7mm），CC的一致性为（SD = 6.6mm；IQR = 8mm）。所有测量的解剖标志的重复性都很好。G与Y、BC、CC之间距离的平均比值（相对于肱骨头大小）分别为-0.45、-0.04和-0.85。Y的比值一致性最大（SD = 0.05；IQR = 0.06），相比之下，BC的一致性为（SD = 0.11；IQR = 0.14），CC的一致性为（SD = 0.13；IQR = 0.17）。Y和BC的比值重复性很好，而CC的比值重复性良好。
Y平面是肩关节置换术中关节盂组件定位的可靠参考，与关节盂表面中心的距离一致，因此可能适用于术前规划。
III级，比较解剖学研究。
