Question

Knee joint and elbow joint are examples of

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

Answer 1

The correct option is A Hinge joint

Saddle joint:

• Saddle joint or sellar joints present between carpal (bones of the wrist)and metacarpal (bones of palm) of thumb.
• Saddle joints show biaxial rotation
• It shows rotation around two planes.

Ball and socket joint:

• Ball and socket joint is a freely movable joint.
• Ball like structure of one bone fits into the socket-like structure of another bone.
• Shoulder and hip joints are examples of ball and socket joints.

Pivot joint:

• Pivot joint allows movement in one direction.
• Pivot joint present between atlas (1stvertebral bone) and axis bone(2ndvertebral bone).
• Pivot joint is the type of synovial joint. They are movable in nature.

Hinge joint:

• Hinge joint gets its name from the hinge present in between the doors. Like how the opening and closing of doors are regulated by a hinge, a similar movement is observed in the elbow and knee joints.
• This joint allows movement only in one direction.
• Interphalangeal joints, elbow joints, and knee joints are a type of hinge joints.

Final answer: Hinge joint

Summary:
The knee and elbow joints are examples of hinge joints.