Almeida Alexandre, Agostini Daniel C, Nesello Pietro Ft, de Almeida Nayvaldo C, Mioso Rafael, Agostini Ana Paula
Orthopaedic Surgeon, Pompeia Hospital, Caxias do Sul, Brazil.
Radiologist Physician, General Hospital, Caxias do Sul, Brazil.
J Shoulder Elb Arthroplast. 2021 Feb 15;5:2471549220987714. doi: 10.1177/2471549220987714. eCollection 2021.
To verify whether reverse baseplate positioning without the support of intraoperative three-dimensional technology is within the acceptable parameters in the literature and whether glenoid bone deformity (GBD) compromises this positioning.
Sixty-nine reverse shoulder arthroplasties were evaluated with volumetric computed tomography (CT). Two radiologists performed blinded CT scan analysis and evaluated baseplate position within 2mm of the inferior glenoid; the inclination and version of the baseplate in relation to the Friedman line; and upper and lower screw and baseplate metallic peg end point positionings. The patients were divided according to the presence of GBD for statistical analyses.
The two radiologists concurred reasonably in their interpretations of the following analyzed parameters: baseplate position within 2mm of the inferior glenoid rim (97.1% and 95.7%), baseplate inclination (82.6% and 81.2%), baseplate version (69.6% and 56.5%), the upper screw reaching the base of the coracoid process (71% and 79.7%), the inferior screw remaining inside the scapula (88.4% and 84.1%), and the metallic peg of the baseplate considered intraosseous (88.4% and 72.5%).
Reverse baseplate positioning without intraoperative three-dimensional technology is within the acceptable parameters of the literature, except for baseplate version and upper screw position. GBD did not interfere with baseplate positioning in reverse shoulder arthroplasty.
验证在无术中三维技术支持的情况下，反向基板定位是否在文献可接受参数范围内，以及肩胛盂骨畸形（GBD）是否会影响这种定位。
对69例反向肩关节置换术进行容积计算机断层扫描（CT）评估。两名放射科医生进行盲法CT扫描分析，并评估基板在下肩胛盂2mm范围内的位置；基板相对于弗里德曼线的倾斜度和旋转角度；以及上下螺钉和基板金属钉端点的定位。根据是否存在GBD对患者进行分组以进行统计分析。
两名放射科医生对以下分析参数的解读基本一致：基板在下肩胛盂边缘2mm范围内的位置（97.1%和95.7%）、基板倾斜度（82.6%和81.2%）、基板旋转角度（69.6%和56.5%）、上螺钉到达喙突基部（71%和79.7%）、下螺钉留在肩胛骨内（88.4%和84.1%）以及基板金属钉位于骨内（88.4%和72.5%）。
在无术中三维技术的情况下，除了基板旋转角度和上螺钉位置外，反向基板定位在文献可接受参数范围内。GBD在反向肩关节置换术中不影响基板定位。
