A comparison of outcomes between class-II and class-III obese patients undergoing robotic ventral hernia repair: a multicenter study

Background: Morbid obesity has been considered a contraindication to ventral hernia repair (VHR) in the past. However, the relationship between a greater body mass index (BMI) and adverse outcomes has yet to be established in the minimally invasive sphere, particularly with robotics, which may offer an effective surgical option in these high-risk patients. We sought to investigate this relationship by comparing the outcomes of class-II (BMI: 35-39.9 kg/m²) and class-III (BMI: ≥ 40 kg/m²) obese patients after robotic VHR (RVHR).

Methods: Data were analyzed from two centers and six surgeons who performed RVHR between 2013 and 2020. Patients with a BMI > 35 kg/m² were included in the study. A 1:1 propensity score match (PSM) analysis was conducted to obtain balanced groups and univariate analyses were conducted to compare the two groups across preoperative, intraoperative, and post-operative timeframes. Postoperative complications and morbidity were reported according to the Clavien-Dindo Classification and comprehensive complication index (CCI^®) systems.

Results: From an initial cohort of 815 patients, 228 patients with a mean BMI of 39.7 kg/m² were included in the study. PSM analysis stratified these into 69 patients for each of the class-II and class-III groups. When comparing matched groups, there were no differences in any of the variables across all timeframes, except for a higher rate of Polytetrafluoroethylene (PTFE)-based mesh use in the class-III group (39.1% vs 17.4%, p = 0.008). The estimated recurrence-free time was 76.4 months (95% CI = 72.5-80.4) for the class-II group and 80.4 months (95% CI = 78-82.8) for the class-III group.

Conclusion: This multicenter study showed no difference in outcomes after RVHR between matched class-II and class-III obese patients.