"The manubriosternal joint, sometimes referred to as the sternomanubrial joint, is the articulation between the upper two parts of the sternum, the manubrium and sternal body. It is at the level of the sternal angle or angle of Louis, which is at the 2nd costal cartilage and the intervertebral disc of T4 and T5 1. This forms an important palpable landmark for clinical examination"