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  • Title: Is it possible to identify the inguinal nerves during hernioplasty? A systematic review of the literature and meta-analysis of cadaveric and surgical studies.
    Author: Cirocchi R, Henry BM, Mercurio I, Tomaszewski KA, Palumbo P, Stabile A, Lancia M, Randolph J.
    Journal: Hernia; 2019 Jun; 23(3):569-581. PubMed ID: 30570686.
    Abstract:
    PURPOSE: Patients who undergo inguinal hernioplasty may suffer from persistent postoperative pain due to inguinal nerve injuries. The aim of this systematic review and meta-analysis was to provide comprehensive data on the prevalence (identification rates), anatomical characteristics, and ethnic variations of the ilioinguinal (IIN), the iliohypogastric (IHN) and the genital branch of the genitofemoral (GNF) nerves. METHODS: The systematic literature search was conducted using the PubMed, Scopus and Web of Science databases. RESULTS: A total of 26 articles (5265 half-body examinations) were included in this study. The identification rate of the IIN was 94.4% (95% CI 89.5-97.9) using a random-effects model. Unweighted multiple regression analysis showed that study sample size (β = - 0.74, p = .036) was the only statistically significant predictor of lower prevalence. The identification rates of the IHN and GNF was 86.7% (95% CI 78.3%-93.3%) and 69.1% (95% CI 53.1%-83.0%) using a random-effects model, respectively. For those outcomes, a visual analysis of funnel and Doi plots indicated irregularity and provided evidence that larger studies tended to have lower identification rates. In terms of the synthesis of anatomical reference points, there was a large and statistically significant amount of heterogeneity for most outcomes. CONCLUSIONS: The identification rates of the inguinal nerves in our study were lower than reported in literature. The lowest was found for GNF, suggesting that this nerve was the most difficult to identify. Knowledge regarding the anatomy of the inguinal nerves can facilitate their proper identification and reduce the risk of iatrogenic injury and postoperative pain.
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