Our knees tend to show more wear and tear as we age, including soreness, aching, and general discomfort from simple daily movements like walking, exercising, and even standing. One of the common underlying causes of knee pain is osteoarthritis, which occurs as the cartilage in the joint deteriorates causing inflammation. Bourbon resident Mike Johnson, 52, had been battling chronic knee pain in his right knee due to osteoarthritis since around age 40. He had resorted to receiving cortisone injections while under the care of an orthopedic specialist in Washington, Mo., which helped for a few years.