Patellofemoral Pain Disorder (Runner's Knee)

Patllofemoral pain syndrome, also known as runner's knee is a type of patellofemoral disorder. The knee joint is formed from three bones that are connected by tendons and ligaments: the femur (thighbone), the tibia (shinbone), and the patella (kneecap).

Runner's knee is pain in the patellofemoral joint – the area where the patella and femur meet. It is often caused by overuse of the knee. In some cases, the pain may be due chondromalacia patellae, which is degeneration of cartilage inside the knee joint.

Anatomy of the patellofemoral joint

The patellofemoral joint is one of three compartments in the knee, alongside the medial and lateral compartments. In a healthy knee, the patella glides smoothly within a groove (trochlea or sulcus) on the femur during movement. This joint is stabilized by a complex network of ligaments, tendons, and soft tissues.

Diagram of the patellofemoral structures of the knee joint, including the patella (kneecap).

Although this condition is often noticed while doing rigorous activities such as running or jumping, a person may also experience pain while squatting, walking up stairs, or even when sitting for long periods of time. Runner's knee can usually be treated without surgery, often with a combination of rest and anti-inflammatory medications. For more detailed information, explore the additional content below.