Certified Electronic Health Records Specialist (CEHRS) Practice Exam

What does a joint classified as diarthrosis indicate?

1. Immovable joint

2. Partially movable joint

3. Freely movable joint

4. Slightly movable joint

The correct answer is: Freely movable joint

A joint classified as diarthrosis indicates a freely movable joint. This classification is part of a broader system in anatomy that categorizes joints based on their mobility. Diarthrosis joints allow for a wide range of motion and are typically the type of joints found in the skeletal system that connect the ends of bones at synovial joints. Examples of diarthrosis joints include the knee, elbow, shoulder, and hips, where the joint structure is designed to enable activities such as bending, extending, pivoting, and rotating. This free mobility is facilitated by the presence of synovial fluid, which lubricates the joint, and the joint capsule, which stabilizes the bones while allowing for movement. Other classifications of joints, such as immovable joints (synarthrosis) or slightly movable joints (amphiarthrosis), either do not permit movement or allow only limited movement, emphasizing the unique feature of diarthrosis as being synonymous with freedom of movement within the context of human physiology.