Knee pain can be caused by the following reasons: First, meniscus deformity, when the meniscus of the knee is discoid meniscus, you can have the symptoms of knee pain, this is due to the discoid meniscus than the normal meniscus is larger than the meniscus, and lead to the meniscus is squeezed when walking, there is knee pain, this time to check the MRI of the meniscus, after the diagnosis to early surgery to remove part of the If the diagnosis is confirmed, early surgery is required to remove part of the disc meniscus, and most patients will be able to improve. Second, chondromalacia of the tibial tuberosity, when adolescents have chronic inflammation of the tibial tuberosity or one-time trauma, they can have pain at the anterior tibial tuberosity of the knee joint after the injury.