What type of joint is the sternum?

There are two articulations: the manubriOSternal (sternomanubrial) and xiphisternal (xiphisternal)joints.The manubriOSternal joint is between the manubrium and the body of the sternum.
The sternal angle indicates the manubriOSternal joint. In adults this is a secondary cartilaginous joint (symphysis).Xiphisternal (xiphosternal) joints are between the xiphoid process and body of the sternum is a primary cartilaginous joint (synchrondrosis) and these bones are united by hyaline cartilage. By age 40 this joint has ossified.