If, unfortunately, the knee is injured, and even more unfortunately, the free movement is restricted by the cast, then you have to pay attention to the following: 1, after the cast to use a pillow to cushion the foot: swelling will occur after the trauma bleeding, causing poor venous lymphatic reflux, cushion the affected limb is conducive to swelling, reduce the feeling of swelling and pain. 2.Pay attention to the condition of the toes within the first few days: If you have severe pain in the injured limb and find that the purple is cold and the toes become inflexible, you must come to the hospital immediately to see the emergency room no matter day or night, do not delay, otherwise it will cause serious consequences such as blood clot and necrosis. 3.The joints that are not fixed, such as the ankle and toe that are exposed outside the cast, should be hooked, stretched and shaken more to promote blood circulation, and can be flexed and stretched quickly, and the limit of flexion and extension can be maintained until the muscles are sore, which helps to prevent joint adhesions and muscle atrophy. 4.After putting on the cast, if you feel a fixed pain at a certain point, you should ask the doctor to check to avoid local skin compression and ulceration. 5.The cast should not be collided or bent to avoid breakage. 6.After putting on the cast, pay attention to personal hygiene, keep it clean, and wrap the exposed toes with cotton in winter to avoid frostbite, but avoid baking on fire. In summer, it is necessary to prevent crawling insects, fleas and foreign objects from falling into the plaster. 7.If you find that the cast is loose (after the first 2-4 weeks), you must come to the hospital for examination and consultation with the doctor. 8.You should not remove the cast yourself for the sake of momentary comfort. The consequences of carelessness are very serious. 9, the image is secondary, do not feel wearing a cast, crutches will not have the face to see people, out in the sun, simple activities are still very necessary, early healing recovery is the first. In a word, victory back to a happy life is the key!