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Objective: 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., Methods: 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., Results: 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%)., Conclusion: 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., Competing Interests: Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2021.)

Objective: The aim was to establish a correlation between the integrity of a suture made in the subscapular tendon (SST), as assessed by an ultrasound examination, and its functionality, as assessed by clinical tests during the postoperative period following reverse shoulder arthroplasty (RSA). A secondary goal is to evaluate the presence and viability of the sutured SST., Methods: This is a retrospective study of 18 RSA patients in whom the SST was repositioned to the anterior face of the humeral osteotomy. The median time of the postoperative evaluation was 31 months. The clinical evaluation consisted of the Gerber lift-off test, the internal rotation (IR) lag sign test, and the abdominal compression test, as well as forward flexion (FF), external rotation (ER), and IR. All patients underwent shoulder ultrasounds to evaluate the SST presence and viability., Results: The SST was visualized in 13 patients (72.2%; 95% confidence interval [CI], 51.5-92.9). Of these 13 patients, the SST presented an altered fibrillar pattern in 5 patients (38.4%; 95% CI, 12.0-64.9) and was considered nonviable. There were no associations between SST viability and a positive Gerber's lift-off test ( P  = .480), a positive IR lag sign test ( P  = .480), or a positive abdominal compression test ( P  = .618). There were no significant differences in FF ( P  = .104), ER ( P  = .196), or IR ( P  = .374) mobility between patients with viable SSTs and those without viable SSTs., Conclusion: It was not possible to demonstrate a correlation between the integrity of the SST repair based on the ultrasound and its functionality as assessed by clinical tests in the postoperative period following an RSA. The SST repair has a high failure rate, as demonstrated by the high incidence of nonviable or absent tendons., (© The Author(s) 2019.)