Playing ball knee sprain situation, first of all should immediately stop the movement, the injured limb free weight-bearing, elevate the affected limb, the application of ice water mixture or ice for the knee of the cold compresses, appropriate compression bandage, to reduce swelling, conducive to venous return. If the pain is more serious, you can give pain relief symptomatic treatment. If there is no relief within a short period of time, it is necessary to go to the regular hospital in time, improve the X-ray examination of the knee joint, CT examination or MRI examination, after a clear diagnosis for further treatment, give the knee joint support external fixation, regular review, so that the symptoms of the knee sprain to get timely and effective relief.