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Your kneecap (the patella) is aligned in a groove at the bottom of your femur, and movement within this groove is referred to as patellar tracking. If your kneecap doesn't move properly in this groove, as you bend and extend your leg while running, it may cause runner's knee. Runnerâs Knee: Risk Factors. Specific factors that can contribute to runner's knee include: 1  Weak thigh muscles. 2  Poor flexibility â tight thigh muscles and ligaments. 3  Overuse â running too much. 4  Trauma or injury. 5  Poor alignment of the kneecap, resulting in wear and tear of the cartilage of the kneecap.
Causes of Knee Pain. Knee pain sometimes stems from runner's knee, a condition that can arise suddenly and is most common among longtime runners. With runner's knee, the kneecap does not maintain a smooth course on its track, causing discomfort. Alternatively, the pain may stem from using poor form or improper footwear.