The knee is the largest joint in the body. People use it heavily every day as they walk, run, climb, or jump. As a result, it is also very prone to injury and pain. When these occur, a doctor may recommend exercises to help a person strengthen the muscles around the knee.
People of all ages may experience knee pain. According to one article, a type of knee pain called patellofemoral pain syndrome, or runner’s knee, is the most common orthopedic condition in sports medicine. In addition to being common in athletic people, knee pain can also be a problem for people who have arthritis.
Source: Medical Xpress