American Board of Surgical Assistants (ABSA) Orthopedic Practice Test

What type of joints are the sternoclavicular and tibiofibular joints categorized as?

1. Hinge

2. Gliding

3. Ball and socket

4. Pivot

The correct answer is: Gliding

The sternoclavicular and tibiofibular joints are categorized as gliding joints. Gliding joints allow for limited movement between the articulating surfaces, which typically result in sliding or gliding motions. In the case of the sternoclavicular joint, it is where the clavicle meets the sternum and allows for small amounts of movement that facilitate arm movements. This type of joint is crucial for enabling a wide range of activities related to the upper limb, especially since it connects the arm to the torso. For the tibiofibular joint, which is located between the tibia and fibula, the gliding mechanism allows for slight movements that help maintain stability and support during weight-bearing activities. Such limited mobility is essential for the function of the lower leg. The nature of gliding joints as being characterized by flat or slightly curved surfaces helps define the movement capabilities of these joints, distinguishing them from other joint types such as hinge joints, which allow for motion in one direction, or ball-and-socket joints, which offer a far greater range of motion.