Question

Which of the following is not a hinge joint?

• A. Finger
• B. Elbow
• C. Knee
• D. Shoulder

Answer 1

The correct option is D

Shoulder

Correct option is (D):
Explanation for correct option:

1. Ball and socket joints can move in many directions and are the most flexible joints in the body.
2. The knob at the end of a bone locks at the cavity present in the other joint like a ball and socket.
3. Examples: The joints between the shoulder and hip joints are ball and socket joints.

Explanation for incorrect options:
Option (A):

1. Freely movable joints allow the movement in just one direction either up and down or sideways in the hinge joint and pivot joints respectively. It allows movement in all directions at the ball and socket joints.
2. Hinge joints are a type of freely movable joint that can articulate up and down only. The joints present in the elbow, knee, and jaw are some examples of hinge joints.
3. The joints between fingers are hinge joints

Option (B):

1. Similarly, the joint present in the elbow is a hinge joint.

Option (D):

1. Knee joints are hinge joints

Final answer: Shoulder joints are a type of ball and socket joint.