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Classifications: Structurally, Functionally, Biomechanically
Based on how the bones are connected.
Based on biomechanical and anatomical properties.
Based on the degree of mobility the joint allows.
Joints
People who are double-jointed have the advantage of being able to throw harder, have a lesser risk of developing arthritis and have a harder time breaking bones. People who are double-jointed also have disadvantages of having loose and unstable joints. Lifting weights and other strength building activties can be painful and harder than for the average person.
Joints: All of our joints are the same right? WRONG!! We have different types of joints, this is why we can move our thumbs and elbows differently. Because our joints function in different ways, they are named differently. There's the hinge, saddle, ball and socket, cartilaginous, synovial, and fibrous joint. Each type of joint functions in a different way. For example: fibrous joints, such as in the skull, have limited to no mobility. Hinge joints, like the elbow, have a limited movement in two directions. Ball and socket joints rotate in a circular motion. Synovial joints are the most common joints in the body and allow a variety of movements.
Double Joints: Being double-jointed is considered a burden and a gift. Extra long ligaments give the illusion of a second join, hence the term double joint. However, this is NOT the case. Being double-jointed can be considered a deformity but it's not set in stone. People who aren't double jointed would, upon seeing a double-joint, consider it a deformity. Most double-jointed people see it as another part of life.
As with anything human joints can have flaws. The most common problem with joints is arthritis. In this picture the hnd on the right is an arthritic hand. The hand on the left is a non-arthritic hand.There are different kinds of arthrits. The most common is osteoarthrits, which is severe cartilage deterioration and inflammation. The less common kind of arthritis is rheumatoid arthritis, which is the swelling of the synovial membrane. When the synovial membrane increases the synovial cavity, which contains synovial fluid for lubrication, becomes smaller creating pressure on the joints. This pressure begins to wear down the cartilage and cause inflammation and pain. Rheumatiod arthritis can spread past joints and into the lungs. If this happens breathing becomes hard and it is possible to suffocate and die. There is no known cure for arthritis but treatments include pain killers and anti-inflammatories.
Crepitus is the technical name for the crackling sound some joints make when they bend...
Joints allow an otherwise rigid structure to bend...
Cracking knuckles doesn't cause arthritis
