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目的评价低位直肠癌低位吻合术后排便功能。方法对６７例低位直肠癌用经肛门环扎结肠直肠（肛管）吻合术，术后随访排便功能２～３年。以徐忠法五项十分评价标准，结合肛门指诊，吻合口位置，术后时间综合分析判断。结果排便功能优良率７１％，吻合平面在外科肛管：排便控制良可率１００％；正常便意７６％；排便感觉区分率９８％。肌间沟平面：排便控制良可率８０％左右，排便次数无一定规律。结论吻合平面与排便功能有关，保留解剖肛管可有良好控制力。区分感觉和吻合平面无关。保留正常便意需保留齿线以上２～４ｃｍ直肠。术后３～６个月排便功能有一定程度恢复。
Objective To evaluate the defecation function of low rectal cancer after low anastomosis. Methods 67 cases of low rectal cancer were treated with transanal cerclage and colorectal anal canal anastomosis. Defecation function was followed up for 2 to 3 years. With Xu Zhongfa’s five criteria for evaluation, combined with anal examination, position of anastomosis, and postoperative comprehensive analysis and judgment. Results The defecation function was excellent in 71%. The anastomotic plane was in the surgical anal canal: the defecation control good rate was 100%; the normal one was 76%; the defecation sensory discrimination rate was 98%. Intermuscular Plane: The rate of defecation control is about 80%, and there is no regular pattern of defecation. Conclusion The anastomosis plane is related to the function of defecation and retention of anatomical anal canal has good control. Distinguish feelings from the plane of the anastomosis. To maintain normal, it is necessary to retain 2 to 4 cm of rectum above the tooth line. 3 to 6 months after the defecation function recovered to some extent.