ABSTRACT

Introduction:

recurrence rates for primary hernia repair range from 0.5 to 15 percent depending upon the hernia site, type of repair, and clinical circumstances. Many risk factors are known and they must be considered before the procedure. In developing countries, follow up and maintenance of databases are critical to understand the real numbers.

Methods:

a retrospective cohort study analyzed adult patients who have undergone inguinal hernia repair at Hospital de Clínicas de Porto Alegre, a tertiary care government public hospital, between 2013 and 2015. Medical records, telephone, and letter contact have been reviewed in order to complete the minimum period of 5 years of follow-up. The analyzed data focused on the surgeon’s experience and the recurrence rate in 5 years of follow-up.

Results:

a total of 1094 medical records were selected and a complete five years follow-up were possible in 454 patients - 538 inguinal hernia repairs due to bilateral approach in 84 patients. These 454 patients answered, in a validated questionnaire about symptoms of recurrence. The total recurrence rate was 9.29%. For the patients who had Nyhus IV, recurrence rate was 24.1% against 9.9% after primary hernia repair, with a 2.4 higher risk. There was no difference in recurrence between surgeons and training surgeons.

Conclusion:

our data reveal an acceptable recurrence rate in a tertiary care hospital with residents, and to our knowledge is the first Brazilian report with long term follow up. An increased re-recurrent hernia was found when compared with primary hernia repair.

Keywords:
Hernia; Inguinal Hernia; Groin Hernia; Recurrent Hernia

RESUMO

Introdução:

a recorrência da hérnia inguinal após hernioplastia varia de 0,5 a 15 por cento, dependendo do local da hérnia, tipo de reparo e circunstâncias clínicas. Muitos fatores de risco são conhecidos e devem ser considerados antes do procedimento. Acompanhamento e adequado bancos de dados são fundamentais para entender a incidência de recidiva.

Métodos:

estudo de coorte retrospectivo analisou hernioplastias inguinais realizados no Hospital de Clínicas de Porto Alegre entre 2013 e 2015. Para concluir 5 anos de seguimento, analisamos o prontuário e fizemos contato telefônico e por correio.

Resultados:

o total de 1094 registros médicos foram selecionados e um seguimento de pelo menos 5 anos foi possível em 454 pacientes - 538 reparos de hérnia inguinal devido à abordagem bilateral em 84 pacientes. Os pacientes responderam um questionário validado sobre sintomas de recorrência. A taxa total de recorrência foi de 9,29%. No grupo masculino, a recorrência foi de 10% contra 4% no grupo feminino. Para os pacientes com hérnia Nyhus IV, a recidiva foi de 24% contra 8% após o reparo da hérnia primária, com um risco de 2,8 maior. Não houve diferença na recorrência entre cirurgiões experientes e em treinamento.

Conclusão:

nossos dados revelam uma taxa de recorrência aceitável em um hospital de ensino, e para o nosso conhecimento é o primeiro artigo com acompanhamento de longo prazo no sul do Brasil. A re-recidiva da hérnia foi maior quando comparada com o reparo da hérnia primária.

Palavras-chave:
Hernia; Hernia Ingunial; Hernia Femoral; Recidiva

INTRODUCTION

Groin hernia repair remains one of the most common surgeries worldwide with more than 20 million surgeries being performed every year¹1 van Veenendaal N, Simons M, Hope W, Tumtavitikul S, Bonjer J. HerniaSurge Group (2020). Consensus on international guidelines for management of groin hernias. Surg Endosc. 2020;34(6):2359-77. doi: 10.1007/s00464-020-07516-5.
https://doi.org/10.1007/s00464-020-07516... ^,22 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-... . However, despite all the progress made in inguinal hernia surgery - development of meshes and laparoscopic surgery - the median recurrence rate can reach 15%, according to the hernia site, repair technique and other clinical conditions²2 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-...

3 Niebuhr H, Köckerling F. Surgical risk factors for recurrence in inguinal hernia repair - a review of the literature. Innov Surg Sci. 2017;2(2):53-9. doi: 10.1515/iss-2017-0013.
https://doi.org/10.1515/iss-2017-0013... ^-44 Jansen PL, Klinge U, Jansen M, Junge K. Risk factors for early recurrence after inguinal hernia repair. BMC Surg. 2009;9:18. doi: 10.1186/1471-2482-9-18.
https://doi.org/10.1186/1471-2482-9-18... .

The recurrence may occur early after surgery or many years later, until 40 to 50 years after surgery⁵5 Köckerling F, Koch A, Lorenz R, Schug-Pass C, Stechemesser B, Reinpold W. How Long Do We Need to Follow-Up Our Hernia Patients to Find the Real Recurrence Rate? Front Surg. 2015;2:24. doi: 10.3389/fsurg.2015.00024.
https://doi.org/10.3389/fsurg.2015.00024... . Besides, there are many studies describing a follow-up for hernia recurrence of 5 years, and according to larger follow-up studies, just 40% of recurrences are diagnosed during this time³3 Niebuhr H, Köckerling F. Surgical risk factors for recurrence in inguinal hernia repair - a review of the literature. Innov Surg Sci. 2017;2(2):53-9. doi: 10.1515/iss-2017-0013.
https://doi.org/10.1515/iss-2017-0013... ^,55 Köckerling F, Koch A, Lorenz R, Schug-Pass C, Stechemesser B, Reinpold W. How Long Do We Need to Follow-Up Our Hernia Patients to Find the Real Recurrence Rate? Front Surg. 2015;2:24. doi: 10.3389/fsurg.2015.00024.
https://doi.org/10.3389/fsurg.2015.00024... .

Recurrence rates dropped significantly after the advent of the Lichtenstein and other mesh repair techniques, leaving no more benefit for elective repair of inguinal hernia without the use of mesh in the adult population. Laparoscopic techniques have emerged as a less invasive surgery and have also contributed to reduction of recurrence rates - transabdominal preperitoneal (TAPP) and totally extraperitoneal (TEP)⁶6 Bullen NL, Massey LH, Antoniou SA, Smart NJ, Fortelny RH. Open versus laparoscopic mesh repair of primary unilateral uncomplicated inguinal hernia: a systematic review with meta-analysis and trial sequential analysis. Hernia. 2019;23(3):461-72. doi: 10.1007/s10029-019-01989-7.
https://doi.org/10.1007/s10029-019-01989... ^,77 Zendejas B, Ramirez T, Jones T, Kuchena A, Ali SM, Hernandez-Irizarry R, et al. Incidence of inguinal hernia repairs in Olmsted County, MN: a population-based study. Ann Surg. 2013;257(3):520-6. doi: 10.1097/SLA.0b013e31826d41c6.
https://doi.org/10.1097/SLA.0b013e31826d... . Thus, the use of mesh and the surgeon’s expertise are crucial to obtain a good result⁸8 Köckerling F, Bittner R, Kraft B, Hukauf M, Kuthe A, Schug-Pass C. Does surgeon volume matter in the outcome of endoscopic inguinal hernia repair? Surg Endosc. 2017;31(2):573-85. doi: 10.1007/s00464-016-5001-z .
https://doi.org/10.1007/s00464-016-5001-... . Factors such as surgical technique, type of mesh, gender, family history, comorbidities, and type of hernia also can influence the risk of recurrence, and the risk is even greater if the repair is a recurrence or a second or third recurrence³3 Niebuhr H, Köckerling F. Surgical risk factors for recurrence in inguinal hernia repair - a review of the literature. Innov Surg Sci. 2017;2(2):53-9. doi: 10.1515/iss-2017-0013.
https://doi.org/10.1515/iss-2017-0013... ^,44 Jansen PL, Klinge U, Jansen M, Junge K. Risk factors for early recurrence after inguinal hernia repair. BMC Surg. 2009;9:18. doi: 10.1186/1471-2482-9-18.
https://doi.org/10.1186/1471-2482-9-18... .

The aim of this study is to identify recurrence rates in 5 years of follow-up at a teaching and tertiary level of health care hospital in the south of Brazil. In addition to these recurrence rates, we expose the difficulty in concluding a long follow-up in research on benign surgical diseases, here using hernias as an example. These challenges have been recently exposed in a Letter to Editors to The World Journal of Hernia and Abdominal Wall Surgery⁹9 Piltcher-da-Silva R, Trapp AG, Castro TL, et al. Hernia research in developing countries - are we looking for needles in haystacks? Hernia. 2020;24(4):683-4. doi: 10.1007/s10029-020-02235-1.
https://doi.org/10.1007/s10029-020-02235... .

METHODS

Retrospective review of medical records of patients undergoing laparoscopic or conventional groin hernia surgery at Hospital de Clínicas de Porto Alegre from 2013 until 2015. The following variables were analyzed: gender, age, comorbidities, surgeon, surgery technique, hernia Nyhus classification (Table 1), perioperative findings, and recurrence rates with a 5 year follow-up. All these variables were identified by medical record evaluation, except the recurrence rate that was achieved by phone and mail contact - for those without an up-to-date telephone record at the hospital, in the letter we asked for the new contact number and then applied the questionnaire by telephone. For identification of hernia recurrence during telephone contact we used the Ventral Hernia Recurrence Inventory (VHRI): with the following questions being - “Do you feel or see a bulge?”, “Do you feel your hernia has come back?” and “Have you undergone surgery for hernia recurrence in another hospital?”.

Exclusion criterion was age below 15 years old at the time of the surgery and the impossibility of contact to conclude the follow-up.

For statistical analysis, Chi-Square and Mann-Whitney tests were used using Stata software version 15.0.

RESULTS

We have selected 1094 medical records of patients that had undergone inguinal hernia repair between 2013 and 2015 in our institution. Since we had difficulties contacting all those patients for revaluation, we ended up with 454 patients with a follow-up of at least 5 years. 410 (90.3%) patients were male and the average age of the total patients was 59.6 years (±14.9 years). In the total sample, the most common comorbidity was systemic arterial hypertension, present in 41.4% of the patients. In addition, 32.8% of the patients had no comorbidities (Table 2). The overall recurrence rate was 9.3% (49 repairs). In female patients, we found a recurrence rate of 4.5% (95% CI 0.5% - 13.9%) while in male patients the recurrence rate was 11.5% (95% CI 7.6% - 13.8%), which is not statistically significant. In cases with recurrence, 10.1% had comorbidities against 12.6% who did not have, showing a difference without statistical significance (p-value: 0.455; Table 2). Surgeries were performed by medical residents in 67.5% (303 repairs) of the time (always under direct supervision of senior surgeons) and by general surgeons who had already graduated (general surgeons, residence preceptors) in 32.5% (146 repairs). An unexpected result was that there was no statistical difference between the recurrence rates of patients operated by training and experienced surgeons, 12.3% vs 10.2%, respectively.

Figure 1
Database results.

Of these 454 patients, 84 underwent bilateral hernia repair, with 27 Lichtenstein technique, 55 transabdominal preperitoneal repair (TAPP), 1 Stoppa repair, and 1 totally extraperitoneal repair (TEP). So, considering bilateral correction as two different hernia repairs, due to the risk of recurrence on both sides, we ending with 538 inguinal hernia corrections. Among the 538 hernioplasties, the most common procedure was the Lichtenstein technique with 379 repairs (70.4%), followed by TAPP 145 repairs (26.9%), MacVay with mesh 7 repairs (1.3%), Stoppa 2 repairs (0.3%), Bassini 2 repairs (0.3%), TEP 2 repairs (0.3%) and MacVay 1 repair (0.1). All patients with posterior wall defect, including femoral hernia, were described and classified together according to the Nyhus classification.

Regarding the classification of the type of hernia, indirect hernias without posterior wall defect (Nyhus I and II,) represented 41.8% (189 repairs) of the total procedures with a recurrence rate of 7.3% (95% CI 3.9%-12.2%) while direct hernias (Nyhus IIIa-c) represented 58.2% (141 repairs) of the total procedures with a recurrence rate of 12.5% (95% CI 10.3% - 15.2%). We did not find statistical difference between these two groups (p-value: 0.106), however, it seems to have clinical significance due to the average number found. Another finding of this study was that the recurrent hernias (Nyhus IV) operated between 2013 and 2015 had a higher rate of recurrence (re-recurrence) when compared with the primary hernia repair (p-value: 0.034). The risk of re-recurrence of inguinal hernia was 2.4 times greater when a procedure was performed for recurrence.

DISCUSSION

Despite the claim that hernia follow-up needs to be for a longer period of time, up to 40 to 50 years, in our reality, it is very difficult or even impossible, at this moment, to perform such a long term follow-up without any database or other mechanisms that allow prolonged contact with the patient. In 2020, we exposed, in a Letter to Hernia Journal, the difficulties in making a suitable follow-up of patients with benign diseases taking into consideration the reality of the national health system in Brazil, due to a large number of patients, oncology patients that need a closer follow-up by the same surgical team and the characteristics of the population⁹9 Piltcher-da-Silva R, Trapp AG, Castro TL, et al. Hernia research in developing countries - are we looking for needles in haystacks? Hernia. 2020;24(4):683-4. doi: 10.1007/s10029-020-02235-1.
https://doi.org/10.1007/s10029-020-02235... . It is known that long-term follow-up is not easy anywhere, but there are research tools that can help and the future looks promising, as was presented by our esteemed colleagues D. Cuccurulo, J. -F. Gillion, L. N. Jorgensen & H. Friis-Andersen, F. Köckerling, John Morrison, E. Perea del Pozo et al., citing the functioning of their hernia database in different countries around the world¹⁰10 Cuccurullo D. Comment to: Hernia research in developing countries-are we looking for needles in haystacks? The importance of national databases. Hernia. 2020;24(4):693-4. doi: 10.1007/s10029-020-02245-z
https://doi.org/10.1007/s10029-020-02245...

11 Gillion JF. Comment to: Hernia research in developing countries-are we looking for needles in haystacks? Start small and progressively grow. Hernia. 2020;24(4):687-8. doi: 10.1007/s10029-020-02240-4.
https://doi.org/10.1007/s10029-020-02240...

12 Jorgensen LN, Friis-Andersen H. Comment to: Hernia research in developing countries: are we looking for needles in haystacks? Insights from the Danish model. Hernia. 2020;24(4):691-2. doi: 10.1007/s10029-020-02242-2.
https://doi.org/10.1007/s10029-020-02242...

13 Köckerling F. Comment to: Hernia research in developing countries-are we looking for needles in haystacks? Follow-up is the Achilles heel of every registry. Hernia. 2020;24(4):685-6. doi: 10.1007/s10029-020-02239-x.
https://doi.org/10.1007/s10029-020-02239...

14 Morrison J. Comment to: Hernia research in developing countries - are we looking for needles in haystacks? Establishing databases is the key. Hernia. 2020;24(4):689-90. doi: 10.1007/s10029-020-02241-3.
https://doi.org/10.1007/s10029-020-02241... ^-1515 Perea del Pozo E, Bustos Jimenez M, Butrón Vila T, et al. Hernia research in developing countries-are we looking for needles in haystacks? Surgeons in action. Hernia. 2020;25(5):1371-3. doi: 10.1007/s10029-020-02317-0.
https://doi.org/10.1007/s10029-020-02317... .

Currently, phone contact has been used as a tool to optimize patient follow-up and provide the development of a scientific medical study without significant loss in the sensitivity and specificity of the evaluation¹⁶16 Baucom RB, Ousley J, Feurer ID, Beveridge GB, Pierce RA, Holzman MD, et al. Patient reported outcomes after incisional hernia repair-establishing the ventral hernia recurrence inventory. Am J Surg. 2016;212(1):81-8. doi: 10.1016/j.amjsurg.2015.06.007.
https://doi.org/10.1016/j.amjsurg.2015.0... . This has already been demonstrated by a study carried out in Brazil and the USA, where the sensitivity and specificity of the telephone evaluation for recurrence of ventral hernia, in Brazil, was 94% and 93%, respectively. In addition, the best performing question was “Do you feel or see a bulge?”, with Youden’s Index of 0.86. This study was carried out using the VHRI questionnaire¹⁷17 Tastaldi L, Barros PHF, Krpata DM, Prabhu AS, Rosenblatt S, Petro CC, et al. Hernia recurrence inventory: inguinal hernia recurrence can be accurately assessed using patient-reported outcomes. Hernia. 2020;24(1):127-35. doi: 10.1007/s10029-019-02000-z.
https://doi.org/10.1007/s10029-019-02000... . As the symptoms and perception of ventral and inguinal hernia are similar, the validity of the method can be extrapolated to the evaluation carried out in this study.

The risk of developing groin hernia varies between genders, reaching values of up to 43% for men and only 6% for women²2 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-... . The difference in risk of recurrence between men and women exposed in the above results, 11.5% vs 4.5% respectively, is also found in the literature, where the average recurrence in males varies between 11.3% to 14.3% against only 7% to 7.4% in females¹⁸18 Köckerling F, Krüger C, Gagarkin I, Kuthe A, Adolf D, Stechemesser B, et al. What is the outcome of re-recurrent vs recurrent inguinal hernia repairs? An analysis of 16,206 patients from the Herniamed Registry. Hernia. 2020;24(4):811-9. doi: 10.1007/s10029-020-02138-1.
https://doi.org/10.1007/s10029-020-02138... . The reason for this difference is still unclear and probably related to lifestyle and work activity¹⁸18 Köckerling F, Krüger C, Gagarkin I, Kuthe A, Adolf D, Stechemesser B, et al. What is the outcome of re-recurrent vs recurrent inguinal hernia repairs? An analysis of 16,206 patients from the Herniamed Registry. Hernia. 2020;24(4):811-9. doi: 10.1007/s10029-020-02138-1.
https://doi.org/10.1007/s10029-020-02138...

19 Ashrafi D, Siddaiah-Subramanya M, Memon B, Memon MA. Causes of recurrences after open inguinal herniorrhaphy. Hernia. 2019;23(4):637-45. doi: 10.1007/s10029-018-1868-z.
https://doi.org/10.1007/s10029-018-1868-... ^-2020 Thiels CA, Holst KA, Ubl DS, McKenzie TJ, Zielinski MD, Farley DR, et al. Gender disparities in the utilization of laparoscopic groin hernia repair. J Surg Res. 2017;210:59-68. doi: 10.1016/j.jss.2016.10.028.
https://doi.org/10.1016/j.jss.2016.10.02... . The only treatment available is surgical, which should be considered even in those oligosymptomatic and asymptomatic cases, since due to the progression of symptoms, 38% will need surgery within 3 years and 70% within 5 to 10 years if watchful waiting is the chosen approach²¹21 de Goede B, Wijsmuller AR, van Ramshorst GH, et al. () Watchful Waiting Versus Surgery of Mildly Symptomatic or Asymptomatic Inguinal Hernia in Men Aged 50 Years and Older: A Randomized Controlled Trial. Ann Surg 2018;267(1):42-9. doi: 10.1097/SLA.0000000000002243.
https://doi.org/10.1097/SLA.000000000000...

22 Fitzgibbons RJ Jr, Ramanan B, Arya S, et al. Long-term results of a randomized controlled trial of a nonoperative strategy (watchful waiting) for men with minimally symptomatic inguinal hernias. Ann Surg. 2013;258(3):508-15. doi: 10.1097/SLA.0b013e3182a19725.
https://doi.org/10.1097/SLA.0b013e3182a1... ^-2323 Rosenberg J, Bisgaard T, Kehlet H, et al. Danish Hernia Database recommendations for the management of inguinal and femoral hernia in adults. Dan Med Bull. 2011;58(2):C4243..

The presence of comorbidities such as diabetes unsettle the healing process and increase the risk of recurrence. Life habits, such as smoking, promote imbalance in the healing process and the composition of collagen, also influencing the appearance of hernias, by promoting the weakening of the abdominal wall and culminating in direct hernia²2 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-... ^,2424 Henriksen NA, Yadete DH, Sorensen LT, Agren MS, Jorgensen LN. Connective tissue alteration in abdominal wall hernia. Br J Surg. 2011;98(2):210-9. doi: 10.1002/bjs.7339.
https://doi.org/10.1002/bjs.7339... . Another factor that is believed to be related to the incidence of groin hernias and the recurrence after repair is the patient’s work activity; (this is believed for jobs that require great mechanical strength and therefore may cause an increase in intra-abdominal pressure). However, there is no consistent evidence to prove this hypothesis¹⁹19 Ashrafi D, Siddaiah-Subramanya M, Memon B, Memon MA. Causes of recurrences after open inguinal herniorrhaphy. Hernia. 2019;23(4):637-45. doi: 10.1007/s10029-018-1868-z.
https://doi.org/10.1007/s10029-018-1868-... ^,2525 Svendsen SW, Frost P, Vad MV, Andersen JH. Risk and prognosis of inguinal hernia in relation to occupational mechanical exposures - a systematic review of the epidemiologic evidence. Scand J Work Environ Health. 2013;39(1):5-26. doi: 10.5271/sjweh.3305.
https://doi.org/10.5271/sjweh.3305... .

A pilot study also carried out at the Hospital de Clínicas de Porto Alegre with analysis and follow-up of hernioplasties performed in 2006 had already identified an average age and ASA classification similar to that found in this study²⁶26 Justo JWR, Carbajal JM, Splitt BI, Mattiello CM, et al. Análise descritiva das hernioplastias inguinais operadas em 2006 no HCPA. Rev HCPA. 2012;32(Suppl):94-5.. This data are also corroborated by the worldwide literature, which shows a similar average age and older age as a risk factor for developing inguinal hernia²2 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-... ^,44 Jansen PL, Klinge U, Jansen M, Junge K. Risk factors for early recurrence after inguinal hernia repair. BMC Surg. 2009;9:18. doi: 10.1186/1471-2482-9-18.
https://doi.org/10.1186/1471-2482-9-18... ^,2727 Sazhin A, Zolotukhin I, Seliverstov E, Nikishkov A, Shevtsov Y, Andriyashkin A, et al. Prevalence and risk factors for abdominal wall hernia in the general Russian population. Hernia. 2019;23(6):1237-42. doi: 10.1007/s10029-019-01971-3.
https://doi.org/10.1007/s10029-019-01971... .

The occurrence of recurrence in 5 years of follow-up identified in this study was 9.29% of patients. Although the follow-up was’t as long as we wanted, the value found is similar with others in the current literature, which varies between 10 and 15%²2 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-...

3 Niebuhr H, Köckerling F. Surgical risk factors for recurrence in inguinal hernia repair - a review of the literature. Innov Surg Sci. 2017;2(2):53-9. doi: 10.1515/iss-2017-0013.
https://doi.org/10.1515/iss-2017-0013... ^-44 Jansen PL, Klinge U, Jansen M, Junge K. Risk factors for early recurrence after inguinal hernia repair. BMC Surg. 2009;9:18. doi: 10.1186/1471-2482-9-18.
https://doi.org/10.1186/1471-2482-9-18... . Reference centers for inguinal hernia treatment are those with a large volume of surgeries a year, that is, more than 126 procedures a year, a group in which our institution fits²⁸28 Maneck M, Köckerling F, Fahlenbrach C, Heidecke CD, Heller G, Meyer HJ, et al. Hospital volume and outcome in inguinal hernia repair: analysis of routine data of 133,449 patients. Hernia. 2020;24(4):747-57. doi: 10.1007/s10029-019-02091-8
https://doi.org/10.1007/s10029-019-02091... . The total number of procedures in the institution added to the number of surgeries performed during training and performed by senior surgeons a year, tend to promote positive reinforcement in the results, reducing the recurrence rate⁸8 Köckerling F, Bittner R, Kraft B, Hukauf M, Kuthe A, Schug-Pass C. Does surgeon volume matter in the outcome of endoscopic inguinal hernia repair? Surg Endosc. 2017;31(2):573-85. doi: 10.1007/s00464-016-5001-z .
https://doi.org/10.1007/s00464-016-5001-... ^,2828 Maneck M, Köckerling F, Fahlenbrach C, Heidecke CD, Heller G, Meyer HJ, et al. Hospital volume and outcome in inguinal hernia repair: analysis of routine data of 133,449 patients. Hernia. 2020;24(4):747-57. doi: 10.1007/s10029-019-02091-8
https://doi.org/10.1007/s10029-019-02091... .

The absence of a significant difference in recurrence between trainees and senior surgeons may be due to the constant presence of preceptorship in this institution. Besides, only the simplest cases are left for first-year residents, until they have the necessary learning curve. The learning curve for performing hernioplasty using the Lichtenstein technique varies in the literature between 25 and 40 procedures²⁹29 Merola G, Cavallaro G, Iorio O, et al. Learning curve in open inguinal hernia repair: a quality improvement multicentre study about Lichtenstein technique. Hernia. 2020;24(3):651-9. doi: 10.1007/s10029-019-02064-x.
https://doi.org/10.1007/s10029-019-02064... ^,3030 Stabilini C, Cavallaro G, Bocchi P, et al. Defining the characteristics of certified hernia centers in Italy: The Italian society of hernia and abdominal wall surgery workgroup consensus on systematic reviews of the best available evidences. Int J Surg. 2018;54(Pt A):222-35. doi: 10.1016/j.ijsu.2018.04.052.
https://doi.org/10.1016/j.ijsu.2018.04.0... . It has been observed that there is a greater relative risk of recurrence in cases where the surgeon performs a few surgeries a year (<10 procedures per year), regardless of training time⁸8 Köckerling F, Bittner R, Kraft B, Hukauf M, Kuthe A, Schug-Pass C. Does surgeon volume matter in the outcome of endoscopic inguinal hernia repair? Surg Endosc. 2017;31(2):573-85. doi: 10.1007/s00464-016-5001-z .
https://doi.org/10.1007/s00464-016-5001-... ^,2929 Merola G, Cavallaro G, Iorio O, et al. Learning curve in open inguinal hernia repair: a quality improvement multicentre study about Lichtenstein technique. Hernia. 2020;24(3):651-9. doi: 10.1007/s10029-019-02064-x.
https://doi.org/10.1007/s10029-019-02064... ^,3030 Stabilini C, Cavallaro G, Bocchi P, et al. Defining the characteristics of certified hernia centers in Italy: The Italian society of hernia and abdominal wall surgery workgroup consensus on systematic reviews of the best available evidences. Int J Surg. 2018;54(Pt A):222-35. doi: 10.1016/j.ijsu.2018.04.052.
https://doi.org/10.1016/j.ijsu.2018.04.0... .

In addition, the most advanced techniques, also performed at the institution and evaluated in this article, need an even longer training time, since they are video laparoscopic techniques and, therefore, the surgeon must already have knowledge of anatomy and technical capacity for their execution. The learning curve for performing TAPP seems to be 50 to 100 procedures, while for TEP it varies from 100 to 250 procedures²⁹29 Merola G, Cavallaro G, Iorio O, et al. Learning curve in open inguinal hernia repair: a quality improvement multicentre study about Lichtenstein technique. Hernia. 2020;24(3):651-9. doi: 10.1007/s10029-019-02064-x.
https://doi.org/10.1007/s10029-019-02064...

30 Stabilini C, Cavallaro G, Bocchi P, et al. Defining the characteristics of certified hernia centers in Italy: The Italian society of hernia and abdominal wall surgery workgroup consensus on systematic reviews of the best available evidences. Int J Surg. 2018;54(Pt A):222-35. doi: 10.1016/j.ijsu.2018.04.052.
https://doi.org/10.1016/j.ijsu.2018.04.0...

31 Köckerling F, Sheen AJ, Berrevoet F, et al. The reality of general surgery training and increased complexity of abdominal wall hernia surgery. Hernia. 2019;23(6):1081-91. doi: 10.1007/s10029-019-02062-z.
https://doi.org/10.1007/s10029-019-02062... ^-3232 Neumayer L, Fitzgibbons R Jr, Itani K, Jonasson O. () Laparoscopic inguinal hernia repair. J Am Coll Surg. 2005;201(3):486-7. doi: 10.1016/j.jamcollsurg.2005.05.029.
https://doi.org/10.1016/j.jamcollsurg.20... . It is important to note that the two laparoscopic techniques, also with the use of mesh, maintained long-term recurrence rates similar to that of the Lichtenstein technique when compared to surgeons with experience in the area³³33 Li J, Ji Z, Li Y. Comparison of laparoscopic versus open procedure in the treatment of recurrent inguinal hernia: a meta-analysis of the results. Am J Surg. 2014;207(4):602-12. doi: 10.1016/j.amjsurg.2013.05.008.
https://doi.org/10.1016/j.amjsurg.2013.0... ^,3434 Dedemadi G, Sgourakis G, Radtke A, Dounavis A, Gockel I, Fouzas I, et al. Laparoscopic versus open mesh repair for recurrent inguinal hernia: a meta-analysis of outcomes. Am J Surg. 2010;200(2):291-7. doi: 10.1016/j.amjsurg.2009.12.009.
https://doi.org/10.1016/j.amjsurg.2009.1... .

It is essential to understand that there is an important pathological difference between the types of hernias, and those with the destruction of the posterior wall (Nyhus IIIa-c) represent greater severity and greater risk of perioperative complications and recurrence, often related to changes in collagen quality or in the relationship between type I and III collagen, whether due to genetics, comorbidities, or lifestyle²2 HerniaSurge Group (2018). International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi: 10.1007/s10029-017-1668-x.
https://doi.org/10.1007/s10029-017-1668-... ^,2424 Henriksen NA, Yadete DH, Sorensen LT, Agren MS, Jorgensen LN. Connective tissue alteration in abdominal wall hernia. Br J Surg. 2011;98(2):210-9. doi: 10.1002/bjs.7339.
https://doi.org/10.1002/bjs.7339... . This resulted in thinner collagen fibers and diminished mechanical strength. Meanwhile, indirect inguinal hernia is the maintenance of patency of the peritoneum-vaginal canal, without major anatomical destruction and often identified in youth.

Another finding of this study was that the recurrent hernias (Nyhus IV) operated between 2013 and 2015 had a higher rate of recurrence (re-recurrence) when compared with the primary hernia repair, 24.1% vs 9.9%, respectively, and a 2.8 times higher risk of recurrence. Such data is corroborated by the literature, in which the repair of recurrences is associated with higher rates of complications and recurrences. In these cases, the laparoscopic repair is shown to be superior¹⁸18 Köckerling F, Krüger C, Gagarkin I, Kuthe A, Adolf D, Stechemesser B, et al. What is the outcome of re-recurrent vs recurrent inguinal hernia repairs? An analysis of 16,206 patients from the Herniamed Registry. Hernia. 2020;24(4):811-9. doi: 10.1007/s10029-020-02138-1.
https://doi.org/10.1007/s10029-020-02138... ^,3535 Bisgaard T, Bay-Nielsen M, Kehlet H. Re-recurrence after operation for recurrent inguinal hernia. A nationwide 8-year follow-up study on the role of type of repair. Ann Surg. 2008;247(4):707-11. doi: 10.1097/SLA.0b013e31816b18e3.
https://doi.org/10.1097/SLA.0b013e31816b... .

The main limitation of the present study is the impossibility of long-term follow-up in a significant number of patients, approximately 50%. Due to the difficulty in face-to-face reassessment of patients, we used a previously validated questionnaire to assess hernia recurrence. Although validated in Brazil, it is not as accurate as face-to-face medical evaluation or imaging evaluation.

CONCLUSION

The loss to follow-up of approximately 50% is significant, measures to improve follow-up should be evaluated. The use of questionnaires through the various means of communication came to assist in patient care and research, always having to be validated.

As demonstrated by our data with low rate of follow-up, we should work to promote the formation of a Unified hernia DataBase, which can be an important tool to achieve more important results. So far, our data demonstrate an incidence of groin hernia recurrence that it’s comparable to the current literature. It also shows that there is an increased risk of re-recurrence, 2.8 times greater. As discussed above, we found a higher rate of recurrence in the male group even without statistical significance, which may be clinically relevant and therefore further studies should be carried out. Thus, recurrent hernia has to be regarded as a multifactorial surgical complication and doctor and patient must be aware of it.

This study demonstrates a retrospective analysis of a sample from an educational institution in the south of Brazil. Therefore clinical trials, with larger samples and with greater geographical diversification are necessary to corroborate the results.

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