Three examples on left shoulders of the distance apex of the humeral head/upper edge of the pectoralis major: On the left, it is easy to find the upper edge of the pectoralis major on this anatomical dissection, in the center, one can see the scale of a specific measurement tool (with an arbitrary spread of 5.5 cm) measuring the distance between the apex of the humeral head/upper edge of the pectoralis major, on the right, a per-operative view of the positioning of the implant at a good distance from the upper edge of the pectoralis major (circled in white).