Sore knees are a complaint we encounter every day in our practices. We spend a lifetime walking on our legs, but unconsciously treat them carelessly. We 'mistreat' our feet with wrong insoles and wrong footwear, thereby overusing our joints, resulting in knee pain. What are knee complaints? With knee pain, you suffer from the knee or the surrounding joints. The cause of knee pain is usually some form of trauma or overuse, but knee pain can also be caused by meniscus problems, a runner's knee, obesity or old age.