Final answer:
Runner's knee, also known as patellofemoral syndrome, is the most common overuse injury among teenage females who are athletes. It is characterized by a dull, aching pain around the front of the knee and deep to the patella. The pain may be felt during activities such as walking, running, going up or down stairs, kneeling, squatting, or even after sitting with the knee bent for a long time.
Step-by-step explanation:
Runner's Knee
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. It often results from excessive running, particularly downhill, but may also occur in athletes who do a lot of knee bending, such as jumpers, skiers, cyclists, weight lifters, and soccer players. It is felt as a dull, aching pain around the front of the knee and deep to the patella. The pain may be felt when walking or running, going up or down stairs, kneeling or squatting, or after sitting with the knee bent for an extended period.