In the beach chair position, when viewing from the posterior portal looking anterior on a right shoulder, which structure will be on the left side of the screen?

When observing the right shoulder in the beach chair position from the posterior portal and looking anteriorly, the glenoid will indeed appear on the left side of the screen. In this perspective, the glenoid faces the anterior direction, and since you are viewing from the back (posterior), the structure that is located toward the midline and anteriorly is the glenoid.

The glenoid is a critical structure in the shoulder joint, serving as the socket for the humeral head. When visualized in this manner, its orientation will naturally place it to the left side of the screen based on the anatomical arrangement. This perspective is essential for surgical procedures and assessments, ensuring that the surgeon or clinician can accurately identify and address issues related to the shoulder anatomy.

Understanding the anatomy and perspective is vital during assessments and interventions in shoulder procedures. The positioning and visualization help ensure that the correct structures are identified and treated accordingly.