Experimental: the posterior approach extrafascial technique group

In 2010, Italian urologist Dr Bocciardi carried out the first clinical practice of separation and resection of the prostate via the vesicorectal fossa, and this new surgical procedure was called Retzius-sparing Robotic Assisted Radical Prostatectomy (RS-RARP). In recent years, the posterior approach extrafascial technique of RS-RARP which has been used to widely resect the prostate and its surrounding fascia and neurovascular bundles, compared with RS-RARP, has been proposed to provide more complete resection of the tumour and reduce the rate of positive margins. The patients are included into the posterior approach extrafascial technique group who undergo the posterior approach extrafascial technique of RS-RARP.

Active_comparator: the anterior approach extrafascial technique group

Anterior approach extrafascial technique is the most traditional method of radical prostatectomy for prostate cancer, in which the prostate is tied ventrally to expose the prostate by cutting the deep dorsal penile vein complex and the surrounding ligaments and fascia, and intraoperatively extensive resection is required to remove the prostate and its surrounding fascia and neurovascular bundles. The patients are included into the anterior approach extrafascial technique group who undergo the anterior approach extrafascial technique robotic assisted radical prostatectomy.