Which of the following is NOT a characteristic of diarthrodial joints?

Diarthrodial joints, also known as synovial joints, are unique in that they allow for a wide range of motion and have specific structural characteristics. One of the key features of these joints is the presence of an articular cavity, which provides space for the joint to move freely. The surfaces of the bones at these joints are lined with articular cartilage that facilitates smooth movement and helps absorb shock. Additionally, diarthrodial joints are surrounded by a ligamentous capsule that helps stabilize the joint while still allowing for mobility.

The continuous connection between bones is a fundamental characteristic of other types of joints, such as fibrous or cartilaginous joints, but not diarthrodial joints. In diarthrodial joints, the bones are connected in such a way that they are not continuous; rather, they have a space in between, the articular cavity, which is filled with synovial fluid that further aids in movement and lubrication.

Thus, the absence of a continuous connection between the bones makes option C not a characteristic of diarthrodial joints. Understanding these characteristics helps clarify the distinct functional and structural differences between various types of joints within the human body.