The lower extremity wasting may be related to the following reasons: 1, there may be systemic malnutrition, there are many patients due to dieting or insufficient food intake, resulting in systemic malnutrition. This is not only in the lower limbs, in other parts of the body will also appear wasting performance. 2, there may be disuse muscle atrophy, this situation is often seen in patients due to the existence of fractures, dislocation or vascular, neurological diseases of the lower limbs, the need for long-term bed, not able to use the lower limbs, the lower limbs of the muscles do not get enough exercise, will gradually produce disuse muscle atrophy, after the performance of the lower limbs will be wasting situation. This situation may also be caused by insufficient exercise, which is very common in today’s society, there are many patients due to occupational or habitual reasons, prolonged sitting or curled up in bed, when the lower limbs do not get enough exercise, will also produce gradual wasting. 4, this situation is likely to be caused by poor posture, such as many patients used to plate The two legs, then after a long time, will find that the legs on the plate will gradually become thinner, is due to this bad sitting posture will lead to poor blood circulation in one lower limb, and then will make this side of the lower limb malnutrition, and then produce the thinning situation.