types of joints
There are 3 main types of joints in the body. Fixed, slightly movable, and Synovial Joints, are the most common types of joints in the body.
The skull is an example of a fixed joint. It does not move. A slightly movable joint allows you to move in a limited way, the spine and vertebrae are an example of this.
My favorite type of joint is the synovial joint. Can you guess why it is called a synovial joint? It contains synovial fluid. This allows the joint to move freely and decreases friction. Ligaments help keep the joint stable and muscles help you move. There are many types of synovial joints in the body: Pivot Joint, Hinge Joint, Ellipsoidal Joint, Ball and Socket Joint, Saddle Joint and gliding joint.
The ball and socket joint is a great favorite. It moves in all directions and is held in place by ligaments. The hip and shoulder joint are ball and socket joints. The knee and elbow are Hinge joints. They move back and forth like the hinge on your bedroom door. Pivot joints help your head move side to side, you definitely wouldn’t want a ball an socket joint for your neck.
Next on the list is the Ellipsoidal joint. For this joint, rotation is limited but that doesn’t stop this joint from moving from side to side. A limited number of these joints are available and some are located in your index finger.
Can I interest you in a one of a kind saddle joint? Only found in the thumbs, it allows it to rock side to side and grasp.
Lastly, this joint is just gliding off the racks it’s the gliding joint. We have so many happy users such as the ankle and wrists. This joint should be used between two bone surfaces held together by ligaments.