<prompt> The largest synovial joint in the body isShoulder jointHip jointKnee jointAnkle joint  <response>: C Knee joint Synovial joints or diarthroses, or diarthroidal joints; are the most common and most moveable type of joints in the body. As with all other joints in the body, synovial joints achieve movement at the point of contact of the articulating bones. Structural and functional differences distinguish the synovial joints from the two other types of joints in the body, with the main structural difference being the existence of a cavity between the articulating bones and the occupation of a fluid in that cavity which a ds movement. 