Knee pain, ranging from general discomfort to consequences of traumatic injury, is one of the most common reasons people seek medical attention. Treatment often includes physical therapy and sometimes includes surgery (according to the American Academy of Orthopedic Surgeons, 600,000 knee replacements are performed every year in the United States alone). But people are also increasingly looking to yoga. A recent Yoga Journal survey suggests over 15 million people currently practice yoga and at least that many more are very interested in beginning a practice. These populations will likely collide. If you do not have a client with knee issues in class now, chances are you will. And soon.