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Ref: https://edurev.in/question/767719/Needed-a-Document-for-pivotal-Related-UnderstandingPivotal-and-Hinge-Joints-Body-Movements-Class-6

Pivot joint, also called rotary joint, or trochoid joint, in vertebrate anatomy, a freely moveable joint(diarthrosis) that allows only rotary movement around a single axis. The moving bone rotates within a ring that is formed from a second bone and adjoining ligament. The pivot joint is exemplified by the joint between the atlas and the axis (first and second cervical vertebrae), directly under the skull, which allows for turning of the head from side to side. Pivot joints also provide for the twisting movement of the bones of the forearm (radius and ulna) against the upper arm, a movement used, for instance, in unscrewing the lid of a jar. 
Pivot joint - Class 6

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1. What is a pivot joint?
Ans. A pivot joint is a type of synovial joint that allows for rotation and movement in only one plane. It consists of a rounded process of one bone that fits into a ring or notch of another bone, allowing for rotational movement.
2. Which bones in the human body have pivot joints?
Ans. The human body has several bones that have pivot joints. The most well-known pivot joint is the one that connects the radius and ulna bones in the forearm, allowing for rotational movement of the hand. Additionally, pivot joints are also found in the neck, where the atlas bone rotates around the axis bone, enabling us to turn our head.
3. How does a pivot joint differ from a hinge joint?
Ans. A pivot joint differs from a hinge joint in terms of the range of movement it allows. While a hinge joint primarily enables movement in one plane, such as the elbow joint, which allows for flexion and extension, a pivot joint allows for rotational movement in addition to flexion and extension.
4. What are the advantages of having pivot joints in the body?
Ans. Pivot joints offer several advantages in the human body. They allow for rotational movement, which is essential for activities such as turning the head, twisting the forearm, and rotating the hand. These movements are crucial for daily activities and tasks that require precision and coordination.
5. What are some common injuries associated with pivot joints?
Ans. Some common injuries associated with pivot joints include dislocation and sprains. Dislocation occurs when the rounded process of one bone slips out of the ring or notch of another bone, causing misalignment and limited movement. Sprains, on the other hand, happen when the ligaments surrounding the pivot joint are stretched or torn due to sudden twists or excessive force. Proper care and rehabilitation are important for recovery from these injuries.
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