Shukla Dave R, McLaughlin Richard J, Lee Julia, Nguyen Ngoc Tram V, Sanchez-Sotelo Joaquin
Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA.
Shoulder Elbow. 2020 Feb;12(1):31-37. doi: 10.1177/1758573218825480. Epub 2019 Feb 5.
Preoperative planning software has been developed to measure glenoid version, glenoid inclination, and humeral head subluxation on computed tomography (CT) for shoulder arthroplasty. However, most studies analyzing the effect of glenoid positioning on outcome were done prior to the introduction of planning software. Thus, measurements obtained from the software can only be extrapolated to predict failure provided they are similar to classic measurements. The purpose of this study was to compare measurements obtained using classic manual measuring techniques and measurements generated from automated image analysis software.
Ninety-five two-dimensional computed tomography scans of shoulders with primary glenohumeral osteoarthritis were measured for version according to Friedman method, inclination according to Maurer method, and subluxation according to Walch method. DICOM files were loaded into an image analysis software (Blueprint, Wright Medical) and the output was compared with values obtained manually using a paired sample -test.
Average manual measurements included 13.8° version, 13.2° inclination, and 56.2% subluxation. Average image analysis software values included 17.4° version (3.5° difference, < 0.0001), 9.2° inclination (3.9° difference, < 0.001), and 74.2% for subluxation (18% difference, < 0.0001).
Glenoid version and inclination values from the software and manual measurement on two-dimensional computed tomography were relatively similar, within approximately 4°. However, subluxation measurements differed by approximately 20%.
术前规划软件已被开发用于在计算机断层扫描（CT）上测量用于肩关节置换术的关节盂版本、关节盂倾斜度和肱骨头半脱位。然而，大多数分析关节盂定位对结果影响的研究是在规划软件引入之前进行的。因此，从该软件获得的测量值只有在与经典测量值相似的情况下才能外推以预测失败情况。本研究的目的是比较使用经典手动测量技术获得的测量值与自动图像分析软件生成的测量值。
根据Friedman方法测量95例原发性盂肱关节骨关节炎患者肩部的二维计算机断层扫描的版本，根据Maurer方法测量倾斜度，根据Walch方法测量半脱位。将DICOM文件加载到图像分析软件（Blueprint，Wright Medical）中，并将输出结果与使用配对样本检验手动获得的值进行比较。
平均手动测量值包括版本13.8°、倾斜度13.2°和半脱位56.2%。平均图像分析软件值包括版本17.4°（差异3.5°，<0.0001）、倾斜度9.2°（差异3.9°，<0.001）和半脱位74.2%（差异18%，<0.0001）。
在二维计算机断层扫描上，软件测量的关节盂版本和倾斜度值与手动测量值相对相似，相差约4°。然而，半脱位测量值相差约20%。
