Colorectal cancer is one of the most common malignant tumors in the world. There are more than 1.7 million new cases worldwide each year, accounting for 9.7% of all cancers. Among them, 840,000 deaths, accounting for 8.5% of all cancer deaths, mortality Second only to lung cancer, liver cancer and gastric cancer. China is a country with high incidence of colorectal cancer, and its morbidity and mortality are the fifth highest in malignant tumors. Rectal cancer is the most common type of colorectal cancer. The incidence of rectal cancer in China is 14.0/100,000, which is the 7th cancer incidence rate in China.

Surgery is still the main treatment for rectal cancer. With the popularization of stapler technology and the application of preoperative neoadjuvant therapy, more and more patients with rectal cancer have treated sphincter preservation surgery for rectal cancer. The proportion of permanent ostomy has dropped to 16.9% to 29% . With the popularity of TME principles worldwide, the standardized treatment of rectal cancer is becoming more and more stable, and the postoperative survival rate of patients is steadily increasing. However, postoperative observation found that some patients with rectal cancer anus-preserving surgery had different degrees of defecation dysfunction after surgery, such as incontinence, tightness, increased frequency of bowel movements, and constipation. These clinical symptoms have been classified as "Low anterior resection syndrome (LARS)" in recent years. The research on LARS is still in its infancy, and its pathogenesis, influencing factors, pathophysiology and other explorations are not deep enough. Behind the various symptoms of low anterior resection syndrome is a complex pathophysiological basis. The symptoms and severity are affected by many changes in intestinal anatomy, nerve injury, postoperative healing process, diet structure and psychological status. The risk factors associated with the onset of defecation dysfunction after rectal cancer anal sphincter preservation include radiotherapy, total mesorectal excision, and tumor location. The role of various risk factors in the pathogenesis of defecation dysfunction after rectal cancer anal sphincter preservation is still controversial. At present, the diagnosis, grading and treatment of LARS are still in the exploration stage, and there is still no effective treatment.

Since the 1980s, a variety of colon-rectal anastomosis methods have been used in clinical practice to improve the dysfunction of rectal cancer after anal sphincter preservation, including J-pouch anastomosis, Colon transverse anastomosis, and end-to-side anastomosis. Each of the above three methods has its advantages and disadvantages: J-type storage bag improves the postoperative bowel movement anastomosis effect, but the technique is complicated and has more anastomotic symptoms; the colon transverse of the colon has a wide application range but the effect of improving the defecation function is poor; It has the longest history, but the time to apply to functional protection is the shortest, and there are few studies. Huttner et al published a meta-analysis published in 2015 (including 1636 cases from 21 clinical trials reports. Compared with end-to-end anastomosis, J-pouch can reduce the frequency of defecation and antidiarrheal drugs after 1 year after surgery. Similar results have been achieved with end-to-side anastomosis and colonic angioplasty; a review published by Brown et al also suggests that J-pouch can reduce the frequency of defecation and urgency of bowel movements during early (0-8 months) and mid-term (8-18 Months) .The end-to-side anastomosis achieved similar effects in each stage of the J-pouch, so it can be inferred that the end-to-side anastomosis (relative to end-to-end anastomosis) can improve postoperative defecation function. A retrospective study of end-to-end anastomosis and end-to-end anastomosis published in China also found that end-to-side anastomosis can reduce bowel movements and improve postoperative defecation function at 6 months after surgery. However, there is still no prospective clinical trial comparing the end-to-side anastomosis and end-to-end anastomosis for postoperative intestinal function. The ideal anastomosis should meet the characteristics of exact effect, simple operation and low complications. The end-to-side anastomosis is one of the potential choices, but its validity and safety lack relevant research evidence and need further study.