Incisional hernias after open versus laparoscopic surgery for colonic cancer: a nationwide cohort study

Background Laparoscopic surgery for colonic cancer decreases the incidence of postoperative complications and length of hospital stay as compared with open surgery, while the oncologic outcome remains equivalent. It is unknown whether the surgical approach impacts on the long-term rate of incisional hernia. Furthermore, risk factors for incisional hernia formation are not fully elucidated. The aim of this study was to evaluate the long-term effect of elective open versus laparoscopic surgery for colonic cancer on development of incisional hernia. Methods This nationwide cohort study included patients operated on electively for colonic cancer with primary anastomosis in Denmark from 2001 to 2008. Patient data were obtained from the database of the Danish Colorectal Cancer Group and merged with data from the National Patient Registry. Multivariable Cox regression and competing risks analysis were performed. Results A total of 8489 patients were included, with a median follow-up of 8.8 (interquartile range 7.0–10.7) years. The incidence of incisional hernia was increased among patients operated on with open techniques compared with patients undergoing laparoscopic surgery (7.3 vs. 5.2 %, p < 0.001). After adjustment for confounders, laparoscopic approach was associated with a decreased risk of incisional hernia formation (hazard ratio [HR] 0.62, 95 % confidence interval [CI] 0.44–0.89; p = 0.009). Other factors associated with increased risk of incisional hernia were wound infection, fascial dehiscence, anastomotic leak, and body mass index >25 kg/m 2 . Conclusions This nationwide analysis demonstrated that laparoscopic as compared with open access for curative resection of colonic cancer was associated with a decreased risk of incisional hernia formation.