Drug injection injury, especially penicillin injection, is the most common cause of sciatic nerve injury, also known as medical sciatic nerve injury, preferably in children, the cause of the injury and the injection site improper direct injury or too large a dose of medication to stimulate the sciatic nerve; sharp instrument injuries, acetabular fracture, pelvic fracture, and dislocation of the hip joint, especially the posterior dislocation, is also a common cause of sciatic nerve injury. How to avoid paralysis of muscles below the thigh or knee? 1, to prevent the attack of wind, cold and dampness in winter to prevent cold and keep warm, not greedy for cold in summer, should avoid the natural wind, fans and air conditioners blowing directly, air-conditioning room and the outside temperature difference should not be too large. 2, to correct bad posture and position to use the correct sleep position, the old saying: “standing as a pine, sitting as a clock, lying as a bow”, sleep position to the right side of the bed slightly flexed legs for the best, so that the spine naturally form a bow, the whole body muscles are relaxed, limbs can be free to change to the most appropriate position. Standing work time such as too long, lumbar muscle fatigue, you can do some balancing act: light collection of gluteal muscles, two knees slightly bent, the pelvis to the front, the abdominal muscles, lumbar vertebrae physiological anterior protuberance becomes flat, you can eliminate lumbar pain and fatigue; seated, it is best to sit on the back of the chair, lumbar back cushion, such as bending bowed back to sit for a long time easy to cause lumbar and back muscle strain. 3, combination of work and rest, such as overloaded work people are easy to fatigue, slow reaction, uncoordinated movement, easy to produce injury or accidental injury; in picking and lifting heavy objects should be straight back and chest, pay attention to the balance of gravity, to prevent lumbar sprains; engaged in manual labor to bring a good lumbar protection, if the lumbar injuries to be treated in a timely manner. 4, moderate exercise Avoid strenuous exercise, excessive twisting and bending, especially the middle-aged and elderly, the body’s various functions appear aging, especially ligaments, fibrous ring degradation, if the exercise is too much, it is easy to cause the fibrous ring rupture, resulting in intervertebral disc herniation. If exercise in moderation, can increase the back muscle strength, maintain spinal balance, improve muscle blood circulation, enhance physical strength, delay the degeneration. Dietary balance: Drink some yellow wine and wine in moderation to promote blood circulation. Eat less fatty, fried, spicy and cold foods. In terms of staple food, in addition to fine grains, it is best to match some coarse grains, which can improve the physiological complementary value.