Closure versus non-closure pelvic peritoneum in laparoscopic abdominoperineal resection for low rectal cancer: a randomized controlled trial

Interventions: group A:Closure of pelvic floor peritoneum;group B:No closure of pelvic floor peritoneum Primary outcome(s): Intraoperative conditions: operation time, closure of the pelvic floor peritoneal suture time, intraoperative blood loss;Postoperative complications: perineal incision infection, abdominal infection, abdominal bleeding or perineal incision bleeding, radioactive enteritis, intestinal fistula, vaginal fistula, bladder fistula obstruction, recurrent intestinal obstruction requiring surgical intervention, and the incidence of perineal hernia, parastomal hernia, reoperation Study Design: Randomized parallel controlled trial