It is clear that hip, knee and elbow flexion deformity is an autosomal recessive genetic disorder, so we should pay attention to genetic disease consultation and prenatal diagnosis. The concentration of AFP in fetal blood reaches its peak at 13 weeks of gestation, and when proteinuria occurs in the fetus, AFP enters the amniotic fluid with urine protein, so prenatal diagnosis is often made by testing the concentration of AFP in amniotic fluid. In pregnant women who have delivered a child with this disease, AFP in amniotic fluid can be used for prenatal diagnosis at 11 to 18 weeks of gestation. In recent years, research on the NpHSI gene sequence has made it possible to make a definitive prenatal diagnosis. Those with secondary infections should be actively prevented by strengthening prevention and hygiene promotion, pregnancy care and prenatal checkups, etc. It is advisable to eat nutritious food in the diet. Such as lean meat, fish, milk, etc. It is advisable to eat a light diet with more vegetables and fruits rich in hygienic elements. In the acute phase or acute attack, when the joints are red, swollen and burning, it is not advisable to enter spicy and stimulating food, and those who have been sick for a long time and have a cold spleen and stomach, eat less cold fruits and shrimp, crab, bamboo shoots and so on. The following foods are recommended to eat less or not: 1, chili pepper pungent warm can help heat, for the acute phase of rheumatoid arthritis is not appropriate to eat. After the disease is stable, you can eat in moderation. 2, pear its cold nature, which hinders the digestive function of the spleen and stomach, for patients with a cold spleen and stomach is not suitable for consumption. After the physical improvement can be eaten in moderation. 3, bitter melon bitter cold, for the spleen and stomach cold patients should not eat. For the acute phase of rheumatoid arthritis and does not belong to the deficiency of cold patients can be eaten in moderation.