Final answer:
Runner's knee, also known as patellofemoral syndrome, is the most common overuse injury among runners. It is characterized by a dull, aching pain around the front of the knee and deep to the patella. Treatment involves stopping the activity that causes pain and gradually resuming activity, as well as strengthening the quadriceps femoris muscle.
Step-by-step explanation:
Runner's knee, also known as patellofemoral syndrome, is the most common overuse injury among runners. It is most frequent in adolescents and young adults, and is more common in females.
Runner's knee is often caused by excessive running, particularly downhill, or by activities that involve a lot of knee bending, such as jumping, skiing, cycling, weightlifting, and soccer. The pain is usually felt as a dull, aching sensation around the front of the knee and deep to the patella. It can occur when walking, running, going up or down stairs, kneeling or squatting, or after sitting with the knee bent for a long period of time.
Treatment for runner's knee involves stopping the activity that causes pain and gradually resuming activity. Strengthening the quadriceps femoris muscle to correct any imbalances is also important for preventing recurrence.