In a recent blog post, we reported about the increased participation in marathon running and how the number of marathon injuries are also increasing as a result. These injuries occur because of the impact that your joints - in particular the knee - absorb during running.

Here are some common marathon knee injuries that may occur from excessive running:

Runner's Knee (also known as chondromalacia or patellofemoral pain) - This condition describes irritation under the kneecap. The cartilage under the kneecap usually glides smoothly as the joint bends, but if it rubs against one side of the joint during movement, it can cause pain. Repetitive movement, most often associated with running, can increase your risk of runner's knee - though this condition can be observed in non-runners as well. (Got runner's knee or want to help prevent it? Check out knee braces for runner's knee.)

Iliotibial Band Syndrome (also known as ITBS) - The iliotibial band is a long, thick mass of tissue that goes from the hip to the outside of the shin bone. It works with your thigh muscles to stabilize the knee. During repetitive movement, such as from marathon running, the iliotibial band may become irritated. This pain can sideline a runner so it's best to take measures to prevent ITBS from occurring by having proper footwear. (Got Iliotibial Band Syndrome or want to help prevent it? Check out knee braces for ITBS.)

Patellar Tendonitis (also known as jumper's knee) - This type of injury is an inflammation of the tendons around the knee joint. Though knee tendonitis is usually a stress injury seen with repetitive jumping, it's also frequently seen in runners. Marathon runners who are often running on hard pavement are at an increased risk. (Got knee tendonitis or want to help prevent it? Check out the DonJoy Cross Strap, one of the best knee braces to alleviate patellar tendonitis pain and to help prevent occurrence.)

If you're a marathon runner, take steps to protect your knee joints. Speak with your doctor at the first sign of knee pain to get the appropriate treatment for your injury.