Joints

=**Joints/Knee Replacements**= Knee Replacements **If someone have a knee severely injured by arthritis or injury and have trouble doing simple activities, then they may need a knee replacement. If they need a full surgery, then they will be given anesthesia to put them temporarily to sleep. During the surgery, an incision will be made at the knee. Then, the damaged part will be removed and the good part of the bone will be shaped to fit the plastic and metal artificial joint. It will then be placed into the spot, the patient will get some sealed up from the cut, and the surgery will be done. Those are some facts about knee replacements.**
 * Joints:**
 * There are 4 different types of joints. The 4 types are:**
 * Ball and socket: these joints have the greatest range of movement. One of the places that contains this joint is the shoulder. It is because the ball-part of the humerous bone fits snuggly into the scapula.**
 * Pivot: these joints spin from side to side. It is contained in the neck and allows partial (180˚) movement. It is one bone that fits on the other.**
 * Hinge: these joints allow a potential lot of forward or backward motion. One of these are contained in the knee. Hinge joints can only move in one direction to its full potential.**
 * Gliding: these joints allow one bone to slide over another. One of these are contained in the hand. They allow limited side-to-side movement, but they enable you to bend and flex those bones.**
 * This is a picture of the skeleton. You can see all of the joints in the places listed.**