The symptom of a knee giving out is most often due to a ligament injury. The knee is held together by ligaments, structures that connect two bones. There are four major and many secondary ones. The sensation of instability—the feeling of your knee giving out—is often due to an injury to at least one of them, which leads to the bones not being held tightly enough in position.
It’s a never-ending pain, sometimes dull, sometimes sharp, accompanied by stiffness and loss of mobility. Fourteen million people suffer from arthritis in the knee. New numbers show that one out of 12 adults over the age of 25 will have a knee replacement sometime during their lifetime. But one new treatment is hoping to delay a replacement and take the pain away by transplanting fat cells.