What type of joint is classified as diarthrotic?

A diarthrotic joint is characterized by its ability to allow a significant range of movement, making it freely movable. This classification includes joints such as the shoulder, hip, knee, and elbow, where the structure enables a wide variety of movements, including rotation, bending, and extension. Diarthrotic joints are synovial in nature, which means they are encased in a joint capsule filled with synovial fluid that lubricates the joint and reduces friction during movement.

The other types of joints are classified differently based on the degree of movement they allow. Immovable joints, for example, possess no movement due to their structure, providing stability, while partially movable joints only offer limited range of motion. Slightly movable joints also provide some flexibility but do not enable the extensive movements characteristic of diarthrotic joints. Therefore, the classification as "freely movable" accurately identifies diarthrotic joints and differentiates them from other types of joints.