de Marinis Rodrigo, Contreras Julio J, Vidal Catalina, Palma Cristóbal, Angulo Manuela, Valenzuela Alfonso, Jaña Ricardo, Calvo Claudio, Liendo Rodrigo, Soza Francisco
Department of Orthopedic Surgery, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
Shoulder and Elbow Unit, Complejo Asistencial Dr. Sótero del Río, Santiago, Chile.
J Shoulder Elb Arthroplast. 2023 Mar 29;7:24715492231167110. doi: 10.1177/24715492231167110. eCollection 2023.
To describe the reverse shoulder arthroplasty angle (RSA angle) in magnetic resonance imaging (MRI) and compare the angle formed using bony landmarks (Bony RSA angle or B-RSA angle) with another angle formed using the cartilage margin as reference (Cartilage RSA angle or C-RSA angle).
Adult patients with a shoulder MRI obtained in our hospital between July 2020 and July 2021 were included. The C-RSA angle and B-RSA angle were measured. All images were independently assessed by 4 evaluators. Intraclass correlation coefficient (ICC) was determined for the B-RSA and C-RSA to evaluate interobserver agreement.
A total of 61 patients were included with a median age of 59 years (17-77). C-RSA angle was significantly higher than B-RSA (25.4° ± 0.7 vs 19.5° ± 0.7, respectively) with a . The overall agreement was considered "good" for C-RSA (ICC = 0.74 [95% CI 0.61-0.83]) and "excellent" for B-RSA angle (ICC = 0.76 [95% CI 0.65-0.85]).
C-RSA angle is significantly higher than B-RSA angle. In cases without significant glenoid wear neglecting to account for the remaining articular cartilage at the inferior glenoid margin may result in superior inclination of standard surgical guides.
描述磁共振成像（MRI）中的反向肩关节置换术角度（RSA角度），并比较使用骨性标志形成的角度（骨性RSA角度或B-RSA角度）与使用软骨边缘作为参考形成的另一个角度（软骨RSA角度或C-RSA角度）。
纳入2020年7月至2021年7月在我院接受肩部MRI检查的成年患者。测量C-RSA角度和B-RSA角度。所有图像均由4名评估者独立评估。确定B-RSA和C-RSA的组内相关系数（ICC）以评估观察者间的一致性。
共纳入61例患者，中位年龄59岁（17-77岁）。C-RSA角度显著高于B-RSA角度（分别为25.4°±0.7与19.5°±0.7）。C-RSA的总体一致性被认为“良好”（ICC = 0.74 [95% CI 0.61-0.83]），B-RSA角度的总体一致性被认为“优秀”（ICC = 0.76 [95% CI 0.65-0.85]）。
C-RSA角度显著高于B-RSA角度。在肩胛盂磨损不明显的情况下，忽略肩胛盂下缘剩余的关节软骨可能会导致标准手术导板的倾斜度增加。
