Description
This VTT transcript captures a medical conference session focused on reverse total shoulder arthroplasty (RTSA) and related biomechanical and clinical outcomes. The first presentation examined return to sports after RTSA in 44 patients, finding a 63.6% return rate, with an average time to return of 9.1 months. Cycling was the most common sport resumed, and return was associated with better postoperative forward flexion and subjective shoulder scores, while higher BMI and diagnosis influenced return likelihood. Audience discussion suggested that fear of limited range of motion, especially internal rotation, may explain why some patients did not resume sports.
The next talk compared preoperative and postoperative shoulder kinematics after RTSA during scaption and forward flexion. Using motion capture in 13 patients, the speaker showed that RTSA increased shoulder range of motion largely through scapular upward rotation, with glenohumeral motion improving as well. The discussion addressed the mix of diagnoses, the contribution of scapular motion versus glenohumeral motion, and the role of compensatory scapular mechanics.
A third study used computer simulation to compare impingement mechanisms in anatomic versus reverse shoulder arthroplasty during activities of daily living. The analysis of 10 CT-based patient models suggested that impingement patterns differ between implant types and activities: anatomic TSA was more prone to impingement during perineal care, while reverse TSA showed more issues during washing the opposite axilla and some combined tasks. Reverse plans achieved lower simulated elevation angles than anatomic plans, and the discussion highlighted the limitations of modeling soft-tissue effects such as the conjoint tendon.
The fourth presentation analyzed scapular rotation and tilt during adduction in the same RTSA cohort, focusing on internal rotation tasks such as the contralateral shoulder scratch test. Postoperative patients showed improved glenohumeral internal rotation and altered scapulothoracic motion, including reduced posterior tilt and increased scapular rotation. The discussion raised concerns about marker placement, BMI-related bias, and the challenges of accurately measuring scapular movement in vivo.
The final talk investigated the use of a superiorly wedged reverse glenoid baseplate to correct inclination in nonarthritic glenoids. In a CT-based simulation study of 149 scapulae, the authors found that a 10-degree superior wedge baseplate reduced bone removal and medialization compared with a standard baseplate, with statistically significant differences across most wedge angles. The discussion noted that the optimal wedge may vary by patient anatomy, especially in smaller glenoids and different population subgroups.
Overall, the session emphasized how RTSA affects sports participation, shoulder kinematics, impingement risk, and implant planning, while also underscoring the importance of personalized surgical strategies and rehabilitation.