Synovitis in children often occurs clinically and is mostly a sterile inflammatory disease caused by excessive running and jumping in children combined with cold. When synovitis occurs in children, the first step in treatment is to instruct the child to avoid activities and to apply local brakes. Next, skin traction on the affected lower extremity and topical fotarine spray can be applied to relieve pain. If the child feels more localized pain, a nonsteroidal anti-inflammatory analgesic can be administered orally. After the occurrence of this condition patients should seek medical attention in a timely manner and should be given the correct treatment in a timely manner under the correct diagnosis of the doctor so as not to delay treatment and further aggravate the condition.