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[Audio] he most common cause of knee pain can hit you in your 30s as easily as it can in your 60s and 70s. Orthopaedic surgeon Robert Nickodem Jr., MD says osteoarthritis, or "wear-and-tear arthritis," is the most common cause of knee pain – and the most common form of arthritis. Osteoarthritis includes more than 100 different types of arthritis or joint inflammation and rates of it have been steadily rising year after year. "Osteoarthritis is like a rusty hinge," says Dr. Nickodem. "The knee still works, but it creaks." Fortunately, osteoarthritis is treatable. You may never be completely pain-free, but you can manage the condition and keep your symptoms under control. To help alleviate the "creaking" and soothe your knee discomfort, Dr. Nickodem recommends:.