What are the types of joints in the body?

Depending on the joint, it may be fixed, slightly flexible, or more flexible. The skull, for example, is made up of several bones that are joined together by fixed joints. The sacroiliac joints that connect our spine to our hips are slightly flexible.

Other slightly flexible joints include the joints between the vertebrae in our spine. By contrast, our hips, shoulders, knees, and finger joints are examples of flexible joints. As a general rule, the more flexible a joint is, and the more weight-bearing responsibility that it has (think of the hip or knee), the more likely that particular joint is to develop arthritis.

There are many different types of flexible joints. For example, the shoulder and hip joints are examples of ball-and-socket joints, the most flexible type of joint in the body. If your shoulder weren't so flexible, you would find it very hard to position your hand where you wanted to in space.

The price for this flexibility is that these joints are more likely to dislocate than those that are less flexible. The knee and elbow are examples of hinge joints, which function in a way similar to the opening and closing of a car door. The thumbs have saddle joints that allow you to pick things up.

Your ankles and wrists have gliding joints that allow the bones to glide smoothly over each other. The pivot joints in your neck allow for side-to-side movement -- you can thank your pivot joints for your ability to give a disapproving headshake whenever you want to!

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