The same parastomal hernia repairs rate in the different approaches to colostomy

This study aimed to compare the parastomal hernia repairs rate in the different approaches to colostomy and investigate the risk factors for parastomal hernia formation in patients with permanent colostomies.

Consecutive rectal cancer patients who underwent abdominoperineal resection from June 2014 to July 2020 in West China Hospital were divided into two groups according to their surgical approach for permanent colostomies. The impact of different approaches to colostomy on parastomal hernia repairs was determined by comparing a group of patients receiving an extraperitoneal route to colostomy with a group receiving transperitoneal. Potential variables were evaluated first with univariate and then multivariate analyses to identify the risk factors for the formation of parastomal hernia.

Two hundred two subjects in the transperitoneal group and 103 in the extraperitoneal group attended the follow-up visit with a median follow-up period of 33 (25th-75th percentiles, 17-46) months. Clinically and radiologically detectable parastomal hernias were present in 76 of 202 (37.6%) and 14 of 103 (13.6%) subjects in the transperitoneal and extraperitoneal groups during the follow-up period (p＜0.01). Besides, 10 of 76 (13.1%) subjects in the transperitoneal group and 2 of 14 (14.3%) subjects in the extraperitoneal group underwent a parastomal hernia operation during the follow-up (p = 0.82). In addition, the transperitoneal approach of colostomy (p = 0.002), older age (p＜0.001), and higher body mass index (p = 0.013) were identified as independent risk factors for the occurrence of parastomal hernia.

Extraperitoneal colostomy decreased the detectable parastomal hernias but did not reduce the surgical repair rate of parastomal hernias.