Anterior knee pain is pain people feel at the front and center of the knee. It is a very common complaint caused by a wide range of muscle- or bone-related conditions or injuries.
Around 1 in 4 adults have knee pain. It is the most frequent reason people consult a doctor for knee conditions. Injury to any of the various tissues found at the anterior knee may cause pain. However, doctors often refer to anterior knee pain as “patellofemoral pain” since it links to the patellofemoral joint.
Source: Medical News Today