Which joint type provides movement on one plane for flexion and extension?

Which joint type provides movement on one plane for flexion and extension?

• A. Pivot joint
• B. Ball and socket joint
• C. Hinge joint
• D. Gliding joint

Answer: (C)

Movement in just one plane for bending and straightening is a hallmark of hinge joints. They function like a door hinge, allowing flexion and extension in the sagittal plane, such as the elbow bending to bring the hand toward the shoulder and then straightening back out. This one-plane limitation comes from the way the surfaces fit together, guiding motion to a single direction and preventing rotation. By contrast, pivot joints mainly rotate around an axis, ball-and-socket joints move in multiple directions, and gliding joints slide past one another rather than producing a pure bending and straightening motion. So the joint type that best fits movement on one plane for flexion and extension is the hinge joint.

Movement in just one plane for bending and straightening is a hallmark of hinge joints. They function like a door hinge, allowing flexion and extension in the sagittal plane, such as the elbow bending to bring the hand toward the shoulder and then straightening back out. This one-plane limitation comes from the way the surfaces fit together, guiding motion to a single direction and preventing rotation. By contrast, pivot joints mainly rotate around an axis, ball-and-socket joints move in multiple directions, and gliding joints slide past one another rather than producing a pure bending and straightening motion. So the joint type that best fits movement on one plane for flexion and extension is the hinge joint.