what type of synovial joint is the knee?

Answer 1

Functions of a synovial joint

How does a synovial joint differ from other joints? A joint is simply where two or more bones meet, but a synovial joint is lubricated with a clear blood plasma from the capillaries and filtered through a membrane around it.

The fluid is called synovial fluid and the membrane which contains and produces it is called a synovial membrane. The fluid works with pads of fat which are stored around the joints to act as a cushion between the bones. The fluid also helps maintain the cartilage in and around the joint. You can see an example of cartilage in the joints when you next have a roast chicken: it's the hard white matter between the thigh bone and the leg bone that you don't eat.

Parts of a synovial joint

Bone
It is mainly the extremities (epiphysis) of the long bones which form the synovial joints. However, in a joint like the knee, there is an extra bone-the patella -which covers the front of the joint.

Ligament
Ligaments connect bone to bone. They are flexible, very strong bundles of parallel fibres. They stop the bones dislocating by restricing their movement.

Cartilage
The ends of the bones are covered in hyaline cartilage. It has a smooth slippery surface and its function is to protect the ends of the bones from jarring and scraping.

Synovial fluid
This is a liquid which fills the cavity in the joint. It reduces friction as the bones move. The fluid has been described as being similar to uncooked egg white-both viscous and flexible.

Examples of a synovial joint

Of course there are synovial joints all over the body, and they are classified into different types. You won't have to remember what all the different types are, but it's helpful to know what synovial joints are around the body, and how they differ.

Gliding
A simple joint, with not much movement. The joints between the vertebrae allow a little movement at each joint. The fact that we have so many vertebrae (and joints between them) allows our back to bend.

Hinge
A joint which has simple backward/forward swing, like a door. Classic examples are the elbow and the phalanges of the hand.

Pivot
A joint which allows rotation in the socket. The atlas and axis (first and second vertebrae under the head) allow your head to rotate. The forearm twists and untwists (flip your hand back and forth) because of a pivot joint between the radius and ulna.

Ball-and-socket
The most flexible joints and also the strongest. These allow swing and rotation and are very stable. The hip and the shoulder are excellent examples.

Ellipsoid
A variation on the ball-and-socket joint, the ellipsoid joint allows swinging and rotation, but only to a certain point. The joints between at the base of the fingers allow the finger to swing forward more than they swing back. This is due to the egg-shaped "socket" at the knuckle.

Answer 2

Most joints are Synovial and the Knee comes under the Hinge section.

Answer 3

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Answer 4

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RE:
what type of synovial joint is the knee?

Answer 5

The knee is the largest synovial joint in the body and has a HINGE action...Synovial is actually the lubricating fluid as far as I can remember...this gives the joint it's name.

Answer 6

Hinge joint which could move in 2 directions only

Answer 7

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Answer 8

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Answer 9

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Answer 10

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