肛管直肠环

结论：该术式保留肛管直肠环，不损伤肛门功能，术后痛苦小，不复发，优于传统挂线疗法。

Conclusion : The advantage of this surgical method is to reserve anal sphincters and anorectic ring without damaging the anal function , which is better than the traditional method .

其钝性损伤轻微而且可逆，对肛管直肠环的损伤造成的功能障碍亦轻微，而且对肛管直肠环的形态没有造成破坏，缩短创面的愈合时间。

Its mild and reversible blunt injury , damage caused by the dysfunction of anorectal ring also slightly , and morphology of anorectal ring caused no damage , shorten wound healing time .

手术在完成全直肠系膜和（或）盆腔淋巴清扫的基础上，向下切断骶骨直肠韧带，达到肛管直肠肌环上缘，相当于齿状线（直肠肛管交界处）水平。

In operation , after total mesorectum resection ( with or without pelvic lymph node dissection ), the rectum was immobilized down and the puborectal ligament and partial levator ani was cut to the level of dentate line .