Some children develop inexplicable knee popping and occasional pain in childhood, but the child’s lack of expression, combined with the busy schedule of some parents, often delays the condition. The causes of knee popping in children and treatment countermeasures. 1, the most common children’s knee popping comes from the disc meniscus of the knee, because the morphological abnormalities of the disc meniscus, resulting in abnormal stress on the posterior side of the meniscus during knee extension movement, appearing in the process of knee extension popping, each popping will cause potential damage to the meniscus, at the same time, most of the meniscus damage in childhood does not appear pain, or will be relieved after rest, often back to be ignored The prognosis for repair of meniscal injuries is poor, while surgery early in the course of symptoms can have good results in the long term, because during childhood development Changing the meniscus morphology can reshape the geometry of the femoral condyle and tibial plateau as the child grows, allowing it to eventually return to a normal knee morphology structure. Therefore, the disc meniscus in children is best treated before the child’s rapid growth period, which is around age 6. 2. Another type of childhood knee popping comes from patients with meniscal laxity, which is characterized by the prevalence in girls, the tenderness of multiple joints throughout the body, the ability to hyperextend the knee joint, and the ability to reverse finger flexion. This is because the meniscus is unstable within the joint, and every time the child moves, it squeezes between the femur and tibia, causing a back and forth bounce and then a sound. Most children with this condition do not have pain. Long-term abnormal stress can cause early damage to the meniscus, some of which occurs in adolescence and requires surgical repair. In this case, surgery should be performed between the ages of 3 and 6 to stabilize the meniscus and return the child’s knee development to normal. 3, abnormal development of the anterior horn of the meniscus, normal meniscus in the tibial plateau has two stops before and after, so that the meniscus in the knee joint weight-bearing is still in the weight-bearing area, to achieve the role of shock absorption and maintenance of knee joint stability, the anterior horn of the development of abnormal most of the anterior horn is missing, healing in the meniscus before the joint ligament, resulting in the anterior horn of the meniscus when weight-bearing from the femur tibia gap, causing a popping sound, while the knee joint is missing Many patients already have an aging knee in middle age, causing inconvenience in life. Early reconstruction of the anterior horn of the meniscus can improve the abnormal stress on the knee joint, allowing the meniscus to return to its normal position and giving patients a good quality of life in the long term. 4, other knee ringing and patellofemoral dysplasia caused by patellofemoral instability, such ringing can clearly feel the vibration of the front side of the knee joint and the abnormal activity of the patella, children in sports fatigue easily fall, such cases need to wear knee patella stabilization knee brace in the early stage, some patients will recover, if there is already obvious instability, or a history of patellar dislocation, it is necessary to surgery If the patella is significantly unstable or has a history of dislocation, then surgery is required. There are other traumatic factors that cause knee popping, including meniscal injury, exfoliative osteochondritis, and synovial chondromatosis, which are generally not overlooked due to a clear history of trauma.