Chronic knee pain is easy to get, and can be extremely painful. Many people that play sports on a regular basis will experience it, and they can tell you that it is not very nice. The most common knee pain that people experience in regards to overuse, is patella tendinitis. This is when the tendon becomes overused, there is too much stress placed on it, and it becomes inflamed and in some cases starts t deteriorate. It takes a lot of load and a lot of time to reach this point, however it can be pretty painful. There are ways to reduce the pain, and cure the injury, but you have to take time to treat it properly.
Usually a chronic injury results from a combination of bad biomechanics, too much stress and muscle imbalances. When a lot of load is being placed on the tendon, and there are imbalances it often takes up even more of the slack. If you have patella tendinitis there are a few things that you can do to immediately help the pain. Icing the area will help to reduce the inflammation, and will also reduce the pain significantly. You can also get a knee strap, which will help reduce the pain and take the load off the tendon. It works by placing pressure on the patella tendon, and therefore reducing the load that it will take. Once you take some of the stress off the area, and redirect it, you will reduce the actual pain you are feeling, but also give it a chance to heal.
A magnetic knee strap is another great idea as it is thought to be able to make the blood circulate through the area and allow it to heal even more. You also need to make sure that you do appropriate exercise rehabilitation in order to work out your muscles imbalances and get the force working through the right area again.