Your elbow is a synovial hinge joint. This type of joint allows for movement along a single axis, similar to the way a door hinge operates. The elbow joint is formed by the connection of the humerus (upper arm bone), the ulna (lower arm bone), and the radius (lower arm bone).
Synovial joints are characterized by a fluid-filled cavity that allows for smooth movement between the bones. This fluid, called synovial fluid, lubricates the joint and reduces friction.
Here are some key features of a hinge joint:
- Limited Movement: Hinge joints primarily allow for flexion and extension movements, like bending and straightening the elbow.
- Stability: The structure of a hinge joint provides stability, preventing excessive movement in other directions.
- Examples: Other examples of hinge joints in the body include the knee and the ankle.
