Joints work so well, we often take them for granted. These wonderfully engineered structures allow us to walk, reach, grasp, and perform dozens of other crucial activities. Yet we hardly even give them a thought--until a problem arises. Then we can only marvel at how difficult it has become to perform each simple task.
There are numerous conditions that can cause joint dysfunction, but of course the most common is arthritis. Many people suffer from osteoarthritis, which is mostly caused by wear and tear. As we get older, our joints get stiff and painful.