When seating the AC Dog Bone button at the base of the coracoid, the orientation line should align with what structure?

The orientation line of the AC Dog Bone button should align with the arch of the coracoid. This alignment is crucial because ensuring that the button is positioned correctly facilitates the proper function of the device in stabilizing the acromioclavicular joint. The arch of the coracoid serves as a stable anatomical reference point, allowing for optimal placement of the button that can effectively support the reconstruction or repair being performed. Aligning with this specific structure helps in maintaining the desired tension and positioning of the surgical construct, ultimately contributing to better surgical outcomes.

The other structures mentioned, such as the base of the scapula, coracoid process, and clavicle, do not provide the same level of precise orientation necessary for the accurate installation of the AC Dog Bone button, hence they are not the correct reference for alignment.