Of all of these joints, the ones that are the most susceptible to maladies outside of a trauma-based incident (ie fracture), are the synovial joints. These are the ones that undergo the most movement and are the most susceptible to wear and tear. These joints are also the ones that can be influenced by nutritional intervention.
Synovial joints are joints that offer an almost complete range of movement. These joints have certain characteristics that set them apart from other joints. The main characteristic really is the presence of a sealed space between the two bones that make the joint. This space is known as the synovial cavity. The ends of the bones in a synovial joint are covered with articular cartilage to provide a lubricated surface and protection.