Yes, all diarthrotic joints are considered synovial joints. To understand why, let’s break down the terminology.
Diarthrosis refers to a type of joint that is highly mobile. These joints allow a wide range of movements, which is crucial for activities that require flexibility and agility, such as running, jumping, and playing sports. Examples of diarthrotic joints include the knee, elbow, and hip.
Synovial joints, on the other hand, are a specific classification of joints characterized by the presence of a synovial cavity filled with synovial fluid. This fluid lubricates the joint, reduces friction between the articular cartilage, and nourishes the cartilage cells. Additionally, synovial joints have a joint capsule that surrounds the joint, providing stability and structure.
Since all diarthrotic joints are synovial in nature, it’s accurate to say that every diarthrotic joint is also a synovial joint. However, not all synovial joints are diarthrotic — some can be limited in movement due to various factors. Therefore, the relationship is that while all diarthrotic joints fall under the category of synovial joints, the reverse is not always true.