Abdominal Incisions and Hernia Development: A Systematic Review and Meta-Analysis of Risk Factors

BackgroundIncisional hernia remains a common complication following abdominal surgery with significant implications for patient quality of life and healthcare costs. This systematic review and meta-analysis aim to evaluate the relationship between various abdominal incision types and the development of hernias, while identifying key risk factors.MethodsA comprehensive literature search was conducted across multiple databases for studies published between January 2000 and January 2025. Studies reporting incisional hernia rates following abdominal surgery with clearly documented incision types and a minimum follow-up of 6 months were included. Data extraction included study characteristics, patient demographics, incision types, hernia rates, and associated risk factors. Random-effects meta-analysis was performed to calculate pooled hernia rates and odds ratios.ResultsForty studies comprising 183 496 patients were included. Midline incisions were associated with the highest hernia rates (12.8-35%, pooled rate 18.7%) compared to transverse incisions (4.8-10.2%, pooled rate 7.4%; OR 0.38, 95% CI 0.26-0.57). In colorectal surgery specifically, midline incisions carried an odds ratio of 11.7 (95% CI 3.3-42.0) for hernia formation compared to transverse approaches. Paramedian, oblique, and Pfannenstiel incisions demonstrated lower hernia rates (2.1-8.6%). Significant patient-related risk factors included obesity (OR 4.74, 95% CI 1.42-15.55), male gender (HR 2.2), COPD (HR 2.35, 95% CI 1.16-4.75), and wound infection (HR 3.66). Most hernias (54-80%) developed within the first year after surgery, though continued development was observed for up to 10 years.ConclusionsTransverse, paramedian, and Pfannenstiel incisions offer significant advantages over midline approaches for reducing incisional hernia risk. Patient-specific factors, particularly obesity and pulmonary comorbidities, substantially influence hernia development. A tailored approach to incision selection based on patient risk profile, coupled with meticulous technique and wound management, is recommended to minimize hernia occurrence.