Evaluation of effect of robotic versus laparoscopic surgical technology on genitourinary function after total mesorectal excision for rectal cancer

Objective: Because the recovery of genitourinary function after total mesorectal excision (TME) is affected by multiple factors, the role of robot-assisted TME technology in postoperative function in previous studies is still controversial. Our study aimed to evaluate the impact of robotic technology on the recovery of genitourinary function after TME for rectal cancer by analysing the correlations between influencing factors of genitourinary function and robotic surgery. Methods: Between January 2017 and January 2020, patients with rectal cancer (cT1-3NxM0) were registered. Genitourinary function was assessed by the International Prostate Symptom Score (IPSS), International Index of Erectile Function (IIEF) test, Female Sexual Function Index (FSFI) and urodynamic examination before surgery and 1, 3, 6, and 12 months postoperatively. Genitourinary function was compared between the laparoscopic total mesorectal excision (L-TME) and robotic total mesorectal excision (R-TME) groups, and the correlative factors associated with postoperative genitourinary function were analysed using the generalized estimated equation (GEE).Results: Compared with L-TME, R-TME showed a superior IPSS, voiding volume, residual urine volume and IIEF score during the early postoperative period. According to the GEE analysis, postoperative genitourinary function was positively correlated with laparoscopic anterior resection/abdomen perineal resection (LAR/APR) but negatively correlated with tumour size, tumour distance to anus, TNM, adjuvant chemotherapy, adjuvant radiotherapy, complete TME, circumferential resection margin (CRM), blood loss, diverting stoma, conversion, and anastomotic leakage.Conclusion: Due to the important role of robotic surgical technology on the influential factors of postoperative genitourinary function and the superiority of identifying and preserving autonomic nerves, robotic technology is conducive to the early recovery of postoperative urogenital function while adhering to oncological dissection principles. No significant difference was found between the da Vinci R-TME and MicroHand R-TME groups.