Which plane would be involved with the amputation of the arm at the shoulder?

The plane involved in the amputation of the arm at the shoulder is the coronal (or frontal) plane. This plane divides the body into anterior (front) and posterior (back) sections and would be used to make a cut that separates the arm from the body at the shoulder joint. The surgical approach may also involve the transverse plane if the amputation is performed at an angle.