Patellofemoral pain syndrome or PFPS is pain in front of the knee and around the kneecap or patella. The condition is also called runner's knee because it often affects athletes. PFPS can also affect people who are not athletes and the pain tends to make daily activities challenging.
Dull, aching pain in the front of the knee is the most common symptom of patellofemoral pain syndrome. The pain may be in one or both knees. Pain is often aggravated by activities that require bending the knees, such as squatting, going up or down stairs, running, and jumping. Pain may also occur after prolonged sitting with the knees bent, such as after an office workday. Cracking or popping of the knee may occur after sitting for a prolonged period of time or when climbing stairs.

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