Which muscle/tendon can be incised 1-1.5cm to help expose during shoulder arthroplasty?

The correct answer is pectoralis major, as it is a large, superficial muscle that plays a significant role in shoulder movements. During shoulder arthroplasty, the muscle can be incised approximately 1-1.5 cm to improve access to the joint without compromising its function substantially. This approach can facilitate better visibility and manipulation of underlying anatomical structures, enabling a more efficient surgical procedure.

The subscapularis, in contrast, is a key rotator cuff muscle that is vital for shoulder stability and function. While it can be manipulated during surgery, significant incisions may lead to postoperative weakness or complications. The infraspinatus and teres major are also important muscles around the shoulder, but incising them is less standard due to the potential impact on shoulder stability and movement during rehabilitation. Thus, while other options might involve approaches to access the shoulder joint, the pectoralis major is the preferred choice for targeted exposure with minimal risk of functional impairment.