Prospective randomized study of stapled versus unstapled mesh in a laparoscopic preperitoneal inguinal hernia repair

Safety of unfixed mesh in laparoscopic total extraperitoneal inguinal hernia repair: A meta-analysis of randomized controlled trials

Background

Whether the effect of the unfixed mesh during laparoscopic total extraperitoneal (TEP) inguinal hernia repair can lead to hernia recurrence remains controversial.

Methods

The PubMed, Cochrane Library, and EMBASE databases were searched to retrieve clinical randomized controlled trials (RCTs) comparing nonfixation of mesh and fixation of mesh in TEP inguinal hernia repair, and we performed a metaanalysis with RevMan 5.3 software.

Results

Fifteen RCTs were included in the metaanalysis, which showed that the operation time (P = 0.001) of the unfixed mesh group was shorter than that of the fixed mesh group; additionally, the postoperative 24-h pain score (P = 0.04) and incidence of urinary retention (P = 0.001) were lower in the unfixed mesh group. There was no significant difference between the unfixed mesh group and the fixed mesh group in terms of hospital stay (P = 0.47), time to resume normal activities (P = 0.51), incidence of haematoma (P = 0.96), incidence of chronic pain (P = 0.20), and recurrence rate (P = 0.09).

Conclusion

Unfixed mesh in TEP inguinal hernia repair shows no elevated recurrence rates compared to fixed mesh and is clinically safe.

Efficacy and safety of mesh non-fixation in patients undergoing laparo-endoscopic repair of groin hernia: a systematic review and meta-analysis

PURPOSE

To examine updated evidence on the efficacy and safety of mesh non-fixation in patients undergoing laparo-endoscopic repair of groin hernias.

METHODS

We searched MEDLINE, Cochrane Central Library, Embase, ClinicalTrials. gov, and ICTRP databases to identify randomized controlled trials. The primary outcomes were recurrence, chronic pain, and return to daily life. The certainty of evidence (CoE) was assessed by grading recommendations, assessments, developments, and evaluations. We performed a subgroup analysis based on the surgical type. This study was registered with PROSPERO (CRD 42022368929).

RESULTS

We included 25 trials with 3,668 patients (4,038 hernias) were included. Mesh non-fixation resulted in little to no difference in hernia recurrence (relative risk [RR]:1.40, 95% confidence interval [CI]:0.59-3.31; I2 = 0%; moderate CoE) and chronic pain (RR:0.48, 95% CI:0.13-1.78; I2 = 77%; moderate CoE), but reduced return to daily life (mean difference [MD]: - 1.79 days, 95% CI: - 2.79 to -0.80; I2 = 96%; low CoE). In subgroup analyses, the transabdominal preperitoneal approach (TAPP) (MD: - 2.97 days, 95% CI: - 4.87 to - 1.08; I2 = 97%) reduced return to daily life than total extraperitoneal inguinal approach (MD: - 0.24 days, 95% CI - 0.71 to 0.24; I2 = 61%) (p = 0.006).

CONCLUSIONS

Mesh nonfixation improves the return to daily life without increasing the risk of hernia recurrence or chronic pain. Surgeons and patients may discuss mesh nonfixation options to accommodate a patient's desired return to daily life. Further trials focusing on TAPP are required to confirm these findings.

Do we need mesh fixation at the laparoscopic hernia repair?

OBJECTIVE

With the development of laparoscopic treatment, widespread use of laparoscopy has become inevitable for the treatment of inguinal hernias, which is one of the most common ailments in surgical practice. Fixing or not fixing the mesh during laparoscopic repair remains a debate. In our study, we aimed to compare patients with and without mesh fixation in terms of postoperative pain, recurrence, complications, hospitalization and return to social life.

METHOD

The surgical technique to be performed was randomly determined, 81 patients whose data were kept prospectively and evaluated retrospectively were included in the study. Total extraperitoneal repair (TEP) was performed in all patients. While the mesh was not fixed in 50 patients, it was fixed with 2 tackers in 31 patients.

RESULTS

When the two groups of patients were compared, the group without mesh fixation was found to be superior in terms of postoperative pain, length of hospital stay and return to social life. There was no difference between the 2 groups in terms of complications and recurrence.

CONCLUSIONS

In the light of these findings, it is seen that TEP hernia repair can be performed safely without mesh fixation, although prospective randomized studies are needed.

Comparison of mesh fixation and non-fixation in transabdominal preperitoneal (TAPP) inguinal hernia repair: a randomized control trial

INTRODUCTION

Mesh fixation in inguinal hernia repair, has been a controversial subject for many years. Therefore, in this study, we evaluated and compared fixation and non-fixation of mesh in Transabdominal Preperitoneal (TAPP) Inguinal hernia repair.

METHODS

In this randomized control trial, 100 patients diagnosed with unilateral inguinal hernia were included. We divided the study population into two groups of fifty. For both groups, a 15 × 13 cm Prolene(polypropylene) mesh was used for repair. In the fixation group, mesh was fixed to the abdominal wall by endoscopic tacks, while in the non-fixation group, mesh was secured at the proper place without any fixation. Postoperative outcomes were complications, recurrence, and pain intensity after 1-, 3- and 6-months.

RESULTS

Postoperative pain intensity in the 1st month [Median of 2 and 0, (P < 0.001)], and 3rd month [Median of 0.5 and 0, (P < 0.001)], in the fixation group were significantly higher than the non-fixation group. However, 6 months after surgery, pain intensity was almost similar for both groups. In the 6th postoperative month, only one patient experienced recurrence who was in the fixation group. The rate of recurrence and urinary retention between the groups was not significant.

CONCLUSION

It was observed that until 6 months after surgery patients who received the non-fixating method of TAPP repair experienced lower levels of pain in comparison to the fixation group while other complications did not differ between the two groups. This trail was registered at www.irct.ir with Trial Registration Number of IRCT20210224050491N1.

Comparison of Early Outcomes in Patients Undergoing Suture Fixation Versus Tack Fixation of Mesh in Laparoscopic Transabdominal Preperitoneal (TAPP) Repair of Inguinal Hernia

Introduction: The advent of laparoscopic techniques in repairing inguinal hernia has significantly improved outcomes of inguinal hernia surgery. However, acute and chronic postoperative pain after fixation of mesh with tacks and the cost of tacking devices are major hindrances to the widespread use of laparoscopic transabdominal preperitoneal (TAPP) repair in resource-poor settings. This study sought to introduce a method of mesh fixation that will reduce the cost of laparoscopic TAPP repair and might help reduce postoperative pain.

Objective: To compare outcomes in the early postoperative period like pain, seroma, hematoma, urinary retention, and neuralgia after fixation with suture versus the tack fixation of mesh in laparoscopic TAPP repair of inguinal hernia. 

Subjects and methods: This study was conducted from 1^st June 2019 to 31^st May 2020. A total of 144 patients between ages 18 and 60 years with an inguinal hernia on any side and having an American Society of Anaesthesiologists (ASA) score of I/II were included in this study. Patients with a recurrent hernia, large scrotal hernia, strangulated and obstructed hernias, ASA III and ASA IV, prostatism, and chronic cough were excluded. Seventy-two patients were in Group A (tack fixation group) while 72 were in Group B (suture fixation group). Separate investigators were assigned to collect pre-operative and post-operative data from both groups, recorded on specially designed proforma.

Results: The age range was 18 to 60 years with a mean age of 46.53 years ±10.01 S.D in Group A and 46.19 ±9.58 S.D in Group B. In Group A 98.6% of patients were male, and 1.4% were females while in Group B 100% of patients were male. It was found that mean pain in Group A was 4.88 ±0.887 and 5.29± 0.777 at 6 hours and 24 hours respectively. Mean pain in group B was 3.43 ±0.962 and 4.11±0.703 at 6 hours and 24 hours respectively. Moreover, mean pain in Group B was significantly less than mean pain in Group A both at 6 hours and 24 hours intervals with a p-value < 0.001. The early postoperative complications were not significantly different in both groups. 

Conclusion: In TAPP repair, suture fixation of mesh is less painful than tack fixation. However, there is no significant difference in the rate of other early postoperative outcomes like seroma, hematoma, urinary retention, and neuralgia. Further multicentric studies with a longer duration of follow-up are needed to validate our results.

Association of Mesh and Fixation Options with Reoperation Risk after Laparoscopic Groin Hernia Surgery: A Swedish Hernia Registry Study of 25,190 Totally Extraperitoneal and Transabdominal Preperitoneal Repairs

BACKGROUND

International guidelines concerning mesh and mesh fixation options in laparoscopic totally extraperitoneal (TEP) and transabdominal preperitoneal (TAPP) groin hernia repair are based on studies focusing on either mesh or fixation. We hypothesized that the value of such recommendations is limited by lacking knowledge on how mesh and fixation interact. The current registry-based nationwide cohort study compared different mesh/fixation combinations for relative risks for reoperation after TEP and TAPP groin hernia repair.

STUDY DESIGN

All TEP and TAPP registered in the Swedish Hernia Registry 2005 to 2017 with standard polypropylene (StdPPM) or lightweight (LWM) flat mesh, having tack, fibrin glue, or no fixation, were included. The endpoint was reoperation due to recurrence as of December 31, 2018. Multivariable Cox regression rendered relative risk differences between the exposures, expressed as hazard ratios (HR) with 95% CIs.

RESULTS

Of 25,190 repairs, 924 (3.7%) were later reoperated for recurrence. The lowest, mutually equivalent, reoperation risks were associated with StdPPM without fixation (HR 1), StdPPM with metal tacks (HR 0.8, CI 0.4 to 1.4), StdPPM with fibrin glue (HR 1.1, CI 0.7 to 1.6), and LWM with fibrin glue (HR 1.2, CI 0.97 to 1.6). Except for with fibrin glue, LWM correlated with increased risk, whether affixed with metal (HR 1.7, CI 1.1 to 2.7), or absorbable tacks (HR 2.4, CI 1.8 to 3.1), or deployed without fixation (HR 2.0, CI 1.6 to 2.6).

CONCLUSIONS

With StdPPM, neither mechanical nor glue fixation seemed to improve outcomes. Thus, for this mesh category, we recommend nonfixation. With LWM, we recommend fibrin glue fixation, which was the only LWM alternative on par with nonaffixed StdPPM.

Outcomes on mesh fixation vs non-fixation in laparoscopic totally extra peritoneal inguinal hernia repair: a comparative study

OBJECTIVES

Inguinal hernia repair is one of the most common general surgical procedure, and laparoscopic approach gained popularity over the open approach. This study aimed to compare the clinical effects of TEP inguinal hernioplasty with or without mesh fixation. The primary outcome was acute post-operative pain.

MATERIAL AND METHODS

A retrospective comparative study on a prospectively collected data was conducted in a large DGH in England between Janu- ary 2017 and December 2019 on 47 patients. The patients were divided into two groups. In group A, mesh fixation was performed with absorbable tackers and in group B no fixation was performed. Patients were followed up to 18 months postoperatively. Data was collected on post-operative pain, cost, recurrences and time taken to return to normal activities. Patients with lower midline scar and complicated inguinal hernias were excluded.

RESULTS

Out of the 47 patients 53% (n= 25) were in group A and 47% (n= 22) in group B. All the patients in both groups were male. The mean postopera- tive pain score at 72h in group A was 7.12 (SD 1.13) and 4.91 (SD 1.23) in group B (p <0.001). Group B patients have taken shorter time to return to normal activities in comparison to group A (p <0.001), while recurrence (2%) rate is higher in group B (p> 0.05).

CONCLUSION

Pain and time taken to return to normal work postoperatively were significantly less in the non-fixation group. The study recommends non-fixation over fixation as it is feasible, cost-effective, causes less post-operative pain and no differences in terms of recurrences.

Fixation versus no fixation in laparoscopic totally extraperitoneal repair of primary inguinal hernia-a systematic review and meta-analysis of randomized controlled trials

INTRODUCTION

The necessity of mesh fixation in laparoscopic totally extraperitoneal (TEP) inguinal hernia repair remains controversial. We performed a systematic review and meta-analysis to compare the effectiveness of mesh fixation versus no fixation in laparoscopic TEP repair for primary inguinal hernia.

MATERIALS AND METHODS

PubMed, EMBASE, and Cochrane databases were searched for relevant articles from January 1992 until May 2020. All trials that compared fixation versus no fixation in TEP repairs for inguinal herniae were included. Recurrent and femoral herniae were excluded from the current analysis. The primary outcome measure was recurrence while secondary outcomes included postoperative pain at 24 h, mean operative time, urinary retention, and seroma rates. Random effects models were used to calculate pooled effect size estimates. Sensitivity analyses were also carried out.

RESULTS

Eight randomized controlled trials were included capturing 557 patients and 715 inguinal herniae. On random effects analysis, there were no significant differences between fixation and no fixation with respect to recurrence (RD 0.00, 95% CI = - 0.01 to 0.01, p = 1.00), operative time (MD 1.58 min, 95% CI = - 0.22 to 3.37, p = 0.09), seroma (OR = 0.70, 95% CI = 0.28 to 1.74, p = 0.44), or urinary retention (RD 0.09, 95% CI = - 0.18 to 0.36, p = 0.53). However, fixation was associated with more pain at 24 h (MD 0.93, 95% CI = 0.20 to 1.66, p = 0.01).

CONCLUSIONS

Mesh fixation in laparoscopic TEP repair for primary inguinal herniae is associated with increased postoperative pain at 24 h but similar recurrence, seroma, and urinary retention. Therefore, it may be omitted.

Transfascial suture fixation technique in laparoscopic repair of inguinal hernia

INTRODUCTION

This study presents the initial results of a transfascial suture mesh fixation technique. This method was devised to reduce operative costs and foreign body-associated risks while embracing the benefits of fixation in laparoscopic inguinal hernia repair.

MATERIALS AND SURGICAL TECHNIQUE

Patients undergoing laparoscopic inguinal hernia repair with transfascial suture fixation (TRANSFIX) in our center between March 2017 and March 2018 were retrospectively reviewed. The procedure is orchestrated by a reusable fascial closure device sequentially puncturing the fascia vertically through the inferior port site and guiding a polypropylene thread through the mesh. The thread is retrieved from the extraperitoneal plane with the device, creating an extracorporeal suture loop to embed a surgical knot at the subcutaneous layer of the port site.

DISCUSSION

In its first year after introduction, 16 TRANSFIX were performed. All patients were men (mean age, 62.6 years). Thirteen hernias (81.3%) were first occurrence, and three (18.8%) were recurrent. Twelve (75.0%) were direct hernias, and three (18.8%) were indirect hernias; one patient presented with concurrent direct and indirect hernia. Median operating time was 41.5 minutes for unilateral repair and 73.0 minutes for bilateral. Median blood loss was 5 mL. One patient had a seroma after unilateral indirect hernia repair. After a median follow-up of 15.5 months (range, 9-21 months), no patient had chronic pain, wound infection, hematoma, or recurrence. Instrumental cost reduction per operation was between $150 and $300. TRANSFIX appears to be a safe and economical mesh fixation method.

Tuning the Interactions in Multiresponsive Complex Coacervate-Based Underwater Adhesives

In this work, we report the systematic investigation of a multiresponsive complex coacervate-based underwater adhesive, obtained by combining polyelectrolyte domains and thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) units. This material exhibits a transition from liquid to solid but, differently from most reactive glues, is completely held together by non-covalent interactions, i.e., electrostatic and hydrophobic. Because the solidification results in a kinetically trapped morphology, the final mechanical properties strongly depend on the preparation conditions and on the surrounding environment. A systematic study is performed to assess the effect of ionic strength and of PNIPAM content on the thermal, rheological and adhesive properties. This study enables the optimization of polymer composition and environmental conditions for this underwater adhesive system. The best performance with a work of adhesion of 6.5 J/m² was found for the complex coacervates prepared at high ionic strength (0.75 M NaCl) and at an optimal PNIPAM content around 30% mol/mol. The high ionic strength enables injectability, while the hydrated PNIPAM domains provide additional dissipation, without softening the material so much that it becomes too weak to resist detaching stress.

Meta-analysis of laparoscopic groin hernia repair with or without mesh fixation

OBJECTIVES

To evaluate comparative outcomes of laparoscopic repair of groin hernia with and without mesh fixation.

METHODS

MEDLINE; EMBASE; CINAHL; CENTRAL; the World Health Organization International Clinical Trials Registry; ClinicalTrials.gov; ISRCTN Register, and bibliographic reference lists were systematically checked. Combination of free text and controlled vocabulary search adapted were applied to thesaurus headings, search operators and limits in each of the above databases. Post-operative pain, procedure time, conversion rate, length of hospital stay, time taken to normal activities, overall complications, seroma formation, cost and recurrence were the outcome parameters. Combined overall effect sizes were calculated using fixed-effect or random-effects models. The work has been reported in line with PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) and AMSTAR (Assessing the methodological quality of systematic reviews) Guidelines. This protocol was registered at the International Prospective Register of Systematic Reviews (registration number: CRD42019139564).

RESULTS

We identified 13 randomized controlled trials reporting a total of 1731 patients (2021 groin hernia) evaluating outcomes of laparoscopic hernia repair with mesh fixation using stapler or tacker (n = 853 patients, 999 hernia) and without mesh fixation (n = 878 patients, 1022 hernia). Mesh Fixation was associated with significantly higher post-operative pain assessed by visual analogue scale (VAS) (MD: 0.59; 95% CI, 0.05-1.13, P = 0.03) and longer procedure time (MD: 2.00; 95% CI, 0.98-3.02, P = 0.0001), compared to no fixation technique. However, there was no significant difference in length of hospital stay (MD:0.09; 95% CI, -0.05-0.23, P = 0.19), time to normal activities, (MD: 0.12; 95% CI, -0.37-0.61, P = 0.69), overall complications (OR: 1.05; 95% CI, 0.77-1.43, P = 0.76), seroma formation (OR: 0.63; 95% CI, 0.39-1.00, P = 0.05) and recurrence rate (RD: 0.00; 95% CI, -0.01-0.01, P = 0.84) between two groups.

CONCLUSIONS

Avoiding mesh fixation with a stapler or tacker during laparoscopic groin hernia repair may reduce postoperative pain and procedure time. Future studies are encouraged to evaluate cost effectiveness of each approach.

Comparison of short- to mid-term efficacy of nonfixation and permanent tack fixation in laparoscopic total extraperitoneal hernia repair: A systematic review and meta-analysis

OBJECTIVE

We systematically reviewed the literature and pooled data for a meta-analysis to compare the efficacy and safety of mesh fixation and nonfixation in laparoscopic total extraperitoneal (TEP) hernia repair.

MATERIALS AND METHODS

We performed a systematic search of PubMed® and a Cochrane review for all randomized controlled trials that compared the efficacy and complications of mesh fixation versus nonfixation in TEP hernia repair. The evaluated outcomes included perioperative (operative time and conversion rate) and postoperative parameters (pain scores, duration of hospital stay, surgical complications including seroma, delayed return of bladder function, chronic pain, and recurrence). Cochrane Collaboration Review Manager Software (RevMan®, version 5.2.6) was used for statistical analysis.

RESULTS

Ten trials met the inclusion criteria and were included in a pooled analysis. In total, 1099 patients (1467 hernias) had received TEP hernia repair (748 and 719 hernia defects in the nonfixation and fixation groups, respectively). The nonfixation group required shorter operative time (weighted mean difference [WMD] = -2.36 min, P = 0.0006) and had less pain on postoperative day 1 (WMD = -0.44, P = 0.04) than the fixation group. No significant differences were observed between groups with regard to conversion rate, hospital stay, recurrence rate, or complication rate. However, the incidence of postoperative urine retention was higher in the fixation group (odds ratio = 0.26, P = 0.03).

CONCLUSION

For patients with a nonrecurrent uncomplicated hernia defect with the size <3 cm, nonfixation yielded comparable efficacy with mesh fixation, but less short-term postoperative pain, and a lower risk of urine retention. In addition, the nonfixation method involved a shorter operative time and lower costs. However, no difference in the incidence of chronic pain was observed.

Mesh fixation technique in totally extraperitoneal inguinal hernia repair - A network meta-analysis

Laparoscopic totally extra-peritoneal inguinal hernia repair is the standard option for inguinal hernia treatment. However, there are various types of mesh fixation and their relative uses are still controversial. This network meta-analysis was conducted to compare and rank the different fixations available for TEP. Medline and Scopus databases were search until February 1, 2017 and using randomized controlled trials comparing outcomes between different mesh fixation techniques were included. The results demonstrated that fifteen RCTs (n = 1783) were eligible for pooling. Five types of mesh fixation were used; metallic tack, no-fixation, absorbable tack, suture, and glue. Network meta-analysis that use metallic tack as the reference, indicated that suture and glue both carried a lower risk of recurrence with pooled risk ratios (RR) of 0.29 (95% CI 0.00, 18.81) and 0.29 (0.07, 1.30), respectively. For overall complications, absorbable tack had lower risk (0.63, 95% CI: 0.02, 16.13). However, none of these estimates reached statistical significance. So, this network meta-analysis suggests that glue and absorbable tack might be best in lowering recurrence risk and complications. However, a large scale RCT is still needed to confirm these results.

TEP for elective primary unilateral inguinal hernia repair in men: what do we know?

INTRODUCTION

Based on the new international guidelines for groin hernia management, there is no one surgical technique that is suited to all patient characteristics and diagnostic findings. Therefore, a tailored approach should be used. Here, a distinction must be made between primary unilateral inguinal hernia in men and in women, bilateral inguinal hernia, scrotal inguinal hernia, inguinal hernia following pelvic and lower abdominal procedures, patients with severe cardiopulmonary complications, recurrent inguinal hernias and incarcerated inguinal and femoral hernias. This paper now explores the relevant studies on TEP for elective primary unilateral inguinal hernia in men, which constitutes the most common indication for repair.

MATERIAL

A systematic search of the available literature was performed in February 2019 using Medline, PubMed, Scopus, Embase, Springer Link and the Cochrane Library. Only meta-analyses, systematic reviews, RCTs and comparative registry studies were considered. 117 publications were identified as relevant.

RESULTS

RCTs and comparative registry analyses demonstrated the advantages of TEP with regard to postoperative complications, complication-related reoperations, and postoperative and chronic pain compared with Lichtenstein repair for elective primary unilateral inguinal hernia repair in men. No relevant differences were found compared with TAPP. Mesh fixation is not needed in TEP, but heavyweight meshes result in a lower recurrence rate. Extraperitoneal bupivacaine analgesia vs placebo does not demonstrate any advantages, but drainage is advantageous for seroma prophylaxis. The risk of chronic pain is negatively influenced by small defects, younger patient age, preoperative pain, higher BMI, postoperative complications, higher ASA score and risk factors.

CONCLUSION

For the subgroup of elective primary unilateral inguinal hernia in men, accounting for a proportion of less than 50% of the total collective, advantages were identified for TEP compared with open Lichtenstein repair but not versus TAPP.

Causes of recurrence in laparoscopic inguinal hernia repair

PURPOSE

Recurrence after laparoscopic inguinal herniorrhaphy is poorly understood. Reports suggest that up to 13% of all inguinal herniorrhaphies worldwide, irrespective of the approach, are repaired for recurrence. We aim to review the risk factors responsible for these recurrences in laparoscopic mesh techniques.

METHODS

A search of the Medline, Embase, Science Citation Index, Current Contents and PubMed databases identified English language, peer reviewed articles on the causes of recurrence following laparoscopic mesh inguinal herniorrhaphy published between 1990 and 2018. The search terms included 'Laparoscopic methods', 'Inguinal hernia; Mesh repair', 'Recurrence', 'Causes', 'Humans'.

RESULTS

The literature revealed several contributing risk factors that were responsible for recurrence following laparoscopic mesh inguinal herniorrhaphy. These included modifiable and non-modifiable risk factors related to patient and surgical techniques.

CONCLUSIONS

Recurrence can occur at any stage following inguinal hernia surgery. Patients' risk factors such as higher BMI, smoking, diabetes and postoperative surgical site infections increase the risk of recurrence and can be modified. Amongst the surgical factors, surgeon's experience, larger mesh with better tissue overlap and careful surgical techniques to reduce the incidence of seroma or hematoma help reduce the recurrence rate. Other factors including type of mesh and fixation of mesh have not shown any difference in the incidence of recurrence. It is hoped that future randomized controlled trials will address some of these issues and initiate preoperative management strategies to modify some of these risk factors to lower the risk of recurrence following laparoscopic inguinal herniorrhaphy.

Non-fixation Versus Fixation of Mesh in Totally Extraperitoneal Repair of Inguinal Hernia: a Comparative Study

Two major issues with laparoscopic inguinal hernia (IH) repair are recurrences and chronic groin pain (CGP). The procedure involves fixing the mesh with the tackers which is believed to increase the rate of CGP due to nerve injuries. Thus, non-fixation of mesh is being proposed but concerns remain regarding increased recurrences. We sought to look at our outcomes after we switched over to non-fixation of mesh in totally extraperitoneal repair (TEP). Retrospective review of prospectively maintained database of 171 repairs was done on 122 patients (fixation 59 and non-fixation 112) during a period of 4 years with an endeavor to complete a minimum of 1 year of clinical follow-up. The primary objective was to assess the recurrence rates and CGP and the secondary objective was to assess operative times, immediate post-op pain, incidence of urinary retention, duration of hospital stay, days taken to return to activity, and cost. The mean operative times for unilateral IH for the fixation and non-fixation groups were 41.8 ± 11.4 and 35.9 ± 9.7 min, respectively (p = 0.021), whereas for bilateral were 66.2 ± 15.6 and 55.3 ± 14.2 min, respectively (p = 0.018). The mean pain score was 3.44 ± 1.2 versus 3.01 ± 1.0; (p = 0.037) in the two groups, respectively. At a mean follow-up of 33.2 ± 17.0 and 18.7 ± 6.2 months, the incidence of CGP was 02 (3.4%) and 3 (2.7%) (p = 1.000) and recurrences were 02 (3.4%) in the two groups, respectively (p = 0.118). Non-fixation of mesh in TEP does not lead to increased recurrence though it does not decrease the incidence of chronic groin pain. Collateral advantage would be decreased operative times, lesser post-operative pain, and decreased costs.

International guidelines for groin hernia management

INTRODUCTION

Worldwide, more than 20 million patients undergo groin hernia repair annually. The many different approaches, treatment indications and a significant array of techniques for groin hernia repair warrant guidelines to standardize care, minimize complications, and improve results. The main goal of these guidelines is to improve patient outcomes, specifically to decrease recurrence rates and reduce chronic pain, the most frequent problems following groin hernia repair. They have been endorsed by all five continental hernia societies, the International Endo Hernia Society and the European Association for Endoscopic Surgery.

METHODS

An expert group of international surgeons (the HerniaSurge Group) and one anesthesiologist pain expert was formed. The group consisted of members from all continents with specific experience in hernia-related research. Care was taken to include surgeons who perform different types of repair and had preferably performed research on groin hernia surgery. During the Group's first meeting, evidence-based medicine (EBM) training occurred and 166 key questions (KQ) were formulated. EBM rules were followed in complete literature searches (including a complete search by The Dutch Cochrane database) to January 1, 2015 and to July 1, 2015 for level 1 publications. The articles were scored by teams of two or three according to Oxford, SIGN and Grade methodologies. During five 2-day meetings, results were discussed with the working group members leading to 136 statements and 88 recommendations. Recommendations were graded as "strong" (recommendations) or "weak" (suggestions) and by consensus in some cases upgraded. In the Results and summary section below, the term "should" refers to a recommendation. The AGREE II instrument was used to validate the guidelines. An external review was performed by three international experts. They recommended the guidelines with high scores. The risk factors for inguinal hernia (IH) include: family history, previous contra-lateral hernia, male gender, age, abnormal collagen metabolism, prostatectomy, and low body mass index. Peri-operative risk factors for recurrence include poor surgical techniques, low surgical volumes, surgical inexperience and local anesthesia. These should be considered when treating IH patients. IH diagnosis can be confirmed by physical examination alone in the vast majority of patients with appropriate signs and symptoms. Rarely, ultrasound is necessary. Less commonly still, a dynamic MRI or CT scan or herniography may be needed. The EHS classification system is suggested to stratify IH patients for tailored treatment, research and audit. Symptomatic groin hernias should be treated surgically. Asymptomatic or minimally symptomatic male IH patients may be managed with "watchful waiting" since their risk of hernia-related emergencies is low. The majority of these individuals will eventually require surgery; therefore, surgical risks and the watchful waiting strategy should be discussed with patients. Surgical treatment should be tailored to the surgeon's expertise, patient- and hernia-related characteristics and local/national resources. Furthermore, patient health-related, life style and social factors should all influence the shared decision-making process leading up to hernia management. Mesh repair is recommended as first choice, either by an open procedure or a laparo-endoscopic repair technique. One standard repair technique for all groin hernias does not exist. It is recommended that surgeons/surgical services provide both anterior and posterior approach options. Lichtenstein and laparo-endoscopic repair are best evaluated. Many other techniques need further evaluation. Provided that resources and expertise are available, laparo-endoscopic techniques have faster recovery times, lower chronic pain risk and are cost effective. There is discussion concerning laparo-endoscopic management of potential bilateral hernias (occult hernia issue). After patient consent, during TAPP, the contra-lateral side should be inspected. This is not suggested during unilateral TEP repair. After appropriate discussions with patients concerning results tissue repair (first choice is the Shouldice technique) can be offered. Day surgery is recommended for the majority of groin hernia repair provided aftercare is organized. Surgeons should be aware of the intrinsic characteristics of the meshes they use. Use of so-called low-weight mesh may have slight short-term benefits like reduced postoperative pain and shorter convalescence, but are not associated with better longer-term outcomes like recurrence and chronic pain. Mesh selection on weight alone is not recommended. The incidence of erosion seems higher with plug versus flat mesh. It is suggested not to use plug repair techniques. The use of other implants to replace the standard flat mesh in the Lichtenstein technique is currently not recommended. In almost all cases, mesh fixation in TEP is unnecessary. In both TEP and TAPP it is recommended to fix mesh in M3 hernias (large medial) to reduce recurrence risk. Antibiotic prophylaxis in average-risk patients in low-risk environments is not recommended in open surgery. In laparo-endoscopic repair it is never recommended. Local anesthesia in open repair has many advantages, and its use is recommended provided the surgeon is experienced in this technique. General anesthesia is suggested over regional in patients aged 65 and older as it might be associated with fewer complications like myocardial infarction, pneumonia and thromboembolism. Perioperative field blocks and/or subfascial/subcutaneous infiltrations are recommended in all cases of open repair. Patients are recommended to resume normal activities without restrictions as soon as they feel comfortable. Provided expertise is available, it is suggested that women with groin hernias undergo laparo-endoscopic repair in order to decrease the risk of chronic pain and avoid missing a femoral hernia. Watchful waiting is suggested in pregnant women as groin swelling most often consists of self-limited round ligament varicosities. Timely mesh repair by a laparo-endoscopic approach is suggested for femoral hernias provided expertise is available. All complications of groin hernia management are discussed in an extensive chapter on the topic. Overall, the incidence of clinically significant chronic pain is in the 10-12% range, decreasing over time. Debilitating chronic pain affecting normal daily activities or work ranges from 0.5 to 6%. Chronic postoperative inguinal pain (CPIP) is defined as bothersome moderate pain impacting daily activities lasting at least 3 months postoperatively and decreasing over time. CPIP risk factors include: young age, female gender, high preoperative pain, early high postoperative pain, recurrent hernia and open repair. For CPIP the focus should be on nerve recognition in open surgery and, in selected cases, prophylactic pragmatic nerve resection (planned resection is not suggested). It is suggested that CPIP management be performed by multi-disciplinary teams. It is also suggested that CPIP be managed by a combination of pharmacological and interventional measures and, if this is unsuccessful, followed by, in selected cases (triple) neurectomy and (in selected cases) mesh removal. For recurrent hernia after anterior repair, posterior repair is recommended. If recurrence occurs after a posterior repair, an anterior repair is recommended. After a failed anterior and posterior approach, management by a specialist hernia surgeon is recommended. Risk factors for hernia incarceration/strangulation include: female gender, femoral hernia and a history of hospitalization related to groin hernia. It is suggested that treatment of emergencies be tailored according to patient- and hernia-related factors, local expertise and resources. Learning curves vary between different techniques. Probably about 100 supervised laparo-endoscopic repairs are needed to achieve the same results as open mesh surgery like Lichtenstein. It is suggested that case load per surgeon is more important than center volume. It is recommended that minimum requirements be developed to certify individuals as expert hernia surgeon. The same is true for the designation "Hernia Center". From a cost-effectiveness perspective, day-case laparoscopic IH repair with minimal use of disposables is recommended. The development and implementation of national groin hernia registries in every country (or region, in the case of small country populations) is suggested. They should include patient follow-up data and account for local healthcare structures. A dissemination and implementation plan of the guidelines will be developed by global (HerniaSurge), regional (international societies) and local (national chapters) initiatives through internet websites, social media and smartphone apps. An overarching plan to improve access to safe IH surgery in low-resource settings (LRSs) is needed. It is suggested that this plan contains simple guidelines and a sustainability strategy, independent of international aid. It is suggested that in LRSs the focus be on performing high-volume Lichtenstein repair under local anesthesia using low-cost mesh. Three chapters discuss future research, guidelines for general practitioners and guidelines for patients.

CONCLUSIONS

The HerniaSurge Group has developed these extensive and inclusive guidelines for the management of adult groin hernia patients. It is hoped that they will lead to better outcomes for groin hernia patients wherever they live. More knowledge, better training, national audit and specialization in groin hernia management will standardize care for these patients, lead to more effective and efficient healthcare and provide direction for future research.

Mesh fixation in endoscopic inguinal hernia repair: evaluation of methodology based on a systematic review of randomised clinical trials

BACKGROUND

The issue of mesh fixation in endoscopic inguinal hernia repair is frequently debated and still no conclusive data exist on differences between methods regarding long-term outcome and postoperative complications. The quantity of trials and the simultaneous lack of high-quality evidence raise the question how future trials should be planned.

METHODS

PubMed, EMBASE and the Cochrane Library were searched, using the filters "randomised clinical trials" and "humans". Trials that compared one method of mesh fixation with another fixation method or with non-fixation in endoscopic inguinal hernia repair were eligible. To be included, the trial was required to have assessed at least one of the following primary outcome parameters: recurrence; surgical site infection; chronic pain; or quality-of-life.

RESULTS

Fourteen trials assessing 2161 patients and 2562 hernia repairs were included. Only two trials were rated as low risk for bias. Eight trials evaluated recurrence or surgical site infection; none of these could show significant differences between methods of fixation. Two of 11 trials assessing chronic pain described significant differences between methods of fixation. One of two trials evaluating quality-of-life showed significant differences between fixation methods in certain functions.

CONCLUSION

High-quality evidence for differences between the assessed mesh fixation techniques is still lacking. From a socioeconomic and ethical point of view, it is necessary that future trials will be properly designed. As small- and medium-sized single-centre trials have proven unable to find answers, register studies or multi-centre studies with an evident focus on methodology and study design are needed in order to answer questions about mesh fixation in inguinal hernia repair.

Comparison of mesh fixation and non-fixation in laparoscopic totally extraperitoneal inguinal hernia repair

PURPOSE

The purpose of this study was to compare laparoscopic total extraperitoneal (TEP) hernia repair procedures with or without mesh fixation for non-recurrent inguinal hernia.

METHODS

100 male patients with non-recurrent inguinal hernia (62 unilateral and 38 bilateral) were included in the study. The patients were randomly assigned to either the mesh fixation group (n = 50) or the mesh non-fixation group (n = 50). The operative and follow-up data of the two groups were analyzed and compared in terms of recurrence rates, postoperative pain, length of hospital stay, and postoperative changes in testicular arterial blood flow.

RESULTS

Pain scores were significantly higher in the mesh fixation group prior to discharge and at the 1st postoperative month (p = 0.034 and 0.001, respectively). Necessity to use narcotic analgesics was higher in the fixation group prior to discharge (p = 0.025). Urinary retention was significantly more frequent in the fixation group than in the non-fixation group. (p = 0.007). The mean operative time and length of hospital stay were similar in both groups. Preoperative and postoperative measurements of testicular arterial blood flow showed a substantial but not statistically significant difference for the frequency of impairment (14.2% in the fixation group and 5.8% in the non-fixation group) (p = 0.176). At long-term follow-up, no recurrence and no nerve injury were determined.

CONCLUSION

Fixation of the mesh to the abdominal wall has been associated with various postoperative complications for no additional benefit in lowering recurrence rates. For non-recurrent inguinal hernia, non-fixation of the mesh is safe and reliable. Further studies with larger sample sizes are necessary for subgroup analyses.

Randomised controlled trial of n-butyl cyanoacrylate glue fixation versus suture fixation of mesh in laparoscopic totally extraperitoneal hernia repair

BACKGROUND:

We present a randomised control trial to compare suture fixation of the mesh with non-mechanical fixation using n-butyl cyanoacrylate (NBCA) glue for laparoscopic totally extraperitoneal (TEP) hernioplasty.

PATIENTS AND METHODS:

After a standard dissection for laparoscopic TEP hernioplasty, the mesh was fixed using sutures or NBCA glue to the Cooper's ligament as per the randomised allocation. The primary endpoints were recurrence at 24 months and chronic groin pain. The secondary endpoints were pain scores, analgesic requirement in the post-operative period and duration of surgery.

RESULTS:

Group A consisting of suture fixation had 127 patients which included a total of 173 hernias while Group B consisting of NBCA had 124 patients including a total of 171 hernias. The patients’ age, sex distribution, body mass indices and co-morbidities were comparable in both groups. No patient suffered any major intra-operative or post-operative complication or mortality. There were no conversions to open surgery in either of the groups. The operating time was similar in both the groups though there was a tendency toward a shorter surgery time in Group B. There was lesser consumption of analgesics in the immediate post-operative period in Group B but this did not reach statistical significance. Using visual analogue scale to measure pain, there was no difference in pain at 48 h; however, Group B patients complained of significantly less pain on day 7 as compared to Group A. Almost 98% of Group A patients and 99.2% of Group B patients completed 24 months of follow-up. There were no recurrences in either groups or was there any significant difference in chronic groin pain, in fact, none of the Group B patients complained of chronic groin pain.

CONCLUSION:

Using NBCA glue to fix the mesh in laparoscopic TEP hernia repair is effective and associated with less pain on day 7 as compared to suture fixation of the mesh.

Bilateral laparoscopic totally extraperitoneal repair without mesh fixation

Background and Objectives:

Mesh fixation during laparoscopic totally extraperitoneal repair is thought to be necessary to prevent recurrence. However, mesh fixation may increase postoperative chronic pain. This study aimed to describe the experience of a single surgeon at our institution performing this operation.

Methods:

We performed a retrospective review of the medical records of all patients who underwent bilateral laparoscopic totally extraperitoneal repair without mesh fixation for inguinal hernia from January 2005 to December 2011. Demographic, operative, and postoperative data were obtained for analysis.

Results:

A total of 343 patients underwent simultaneous bilateral laparoscopic totally extraperitoneal repair of 686 primary and recurrent inguinal hernias from January 2005 to December 2011. The mean operative time was 33 minutes. One patient was converted to an open approach (0.3%), and 1 patient had intraoperative bladder injury. Postoperative hematoma/seroma occurred in 5 patients (1.5%), wound infection in 1 (0.3%), hematuria in 2 (0.6%), and acute myocardial infarction in 1 (0.3%). Chronic pain developed postoperatively in 9 patients (2.6%); 3 of them underwent re-exploration. All patients were discharged home a few hours after surgery except for 3 patients. Among the 686 hernia repairs, there were a total of 20 recurrences (2.9%) in 18 patients (5.2%). Two patients had bilateral recurrences, whereas 16 had unilateral recurrences. Twelve of the recurrences occurred after 1 year (60%). Fourteen recurrences occurred among direct hernias (70%).

Conclusion:

Compared with the literature, our patients had fewer intraoperative and postoperative complications, less chronic pain, and no increase in operative time or length of hospital stay but had a slight increase in recurrence rate.

Prospective, randomized and controlled study of mesh displacement after laparoscopic inguinal repair: fixation versus no fixation of mesh

INTRODUCTION

Repair of inguinal hernia is one of the most common elective operations performed in general surgery practice. Mesh hernia repair became the gold standard because of its low recurrence rate in comparison with non-tension-free repair. Laparoscopic approach seems to have potential advantages over open techniques, including faster recovery and reduced acute and chronic pain rate. Laparoscopic mesh fixation is usually performed using staples, which is associated with higher cost and risk for chronic pain. Recently, the role of mesh fixation has been questioned by several surgeons.

AIM

To evaluate mesh displacement in patients undergoing laparoscopic inguinal hernia repair comparing mesh fixation with no fixation.

METHODS

From January 2012 to May 2014, 60 consecutive patients with unilateral inguinal hernia were randomized into two groups: control group--10 patients underwent totally extraperitoneal (TEP) repair with mesh fixation; NO FIX group-50 patients underwent TEP repair with no mesh fixation. Mesh was marked with three 3-mm surgical clips at its medial inferior, medial superior and lateral inferior corners. Mesh displacement was measured by comparing an initial X-ray, performed in the immediate postoperative period, with a second X-ray obtained 30 days later.

RESULTS

The mean displacement of all three clips in control group was 0.1-0.35 cm (range 0-1.2 cm), while in NO FIX group was 0.1-0.3 cm (range 0-1.3 cm). The overall displacement of control and NO FIX group did not show any difference (p = 0.50).

CONCLUSION

Fixation of the mesh for TEP repair is unnecessary. TEP repair with no mesh fixation is safe and is not associated with increased risk of mesh displacement.

Mesh fixation in TAPP laparoscopic hernia repair: introduction of a new method in a prospective randomized trial

BACKGROUND

Mesh fixation is a critical step in TAPP laparoscopic hernia repair because tackers used for this purpose are associated with possible neuralgia.

METHODS

For the present study, 70 patients referred with unilateral inguinal or femoral hernia were divided in two groups for hernia repair. In first group mesh was fixed with titanium tacker. In the second group mesh was fixed with a single suture of Vicryl.

RESULTS

Patients in the Vicryl group experienced less postoperative pain and analgesic consumption. Six month follow-up demonstrated no hernia recurrence either.

CONCLUSIONS

According to results, use of Vicryl suture instead of a titanium tacker is beneficial owing to reduced pain, less analgesic consumption, and lower cost.

Recurrence after groin hernia repair-revisited

One of the commonly performed operations all over the world is hernia repair. Various open and laparoscopic procedures are available now for hernia repair. They are judged mainly by the recurrence rate following operation. The recognition of the causes of recurrence makes their prevention/elimination possible. Articles on hernia recurrence published in various journals over the past 40 years have been analysed. This review article mainly focuses on the causes of recurrence of hernia and their prevention. The causes of recurrence following open and laparoscopic hernia repair have been analysed. In open repair, early recurrences are due to faults in operative technique and postoperative infection. Late recurrences are due to patient factors like collagen defects, age and medical morbidities. In laparoscopic repair, technical aspects of surgery like dissection, mesh placement and fixation are the important factors which decide hernia recurrence.

Laparoscopic totally extraperitoneal inguinal hernia repair: 10-year experience of a single surgeon

BACKGROUND

The advantages of laparoscopic hernia repair on reducing postoperative pain and an earlier return to normal activities with similar recurrence rate have been confirmed by various studies. The objective of this study was to assess the effectiveness of laparoscopic totally extraperitoneal repair.

METHODS

Patients who underwent laparoscopic inguinal hernia repair between December 2000 and December 2010 were enrolled retrospectively. Patient demographics, operative and postoperative course, and outpatient follow-ups were studied.

RESULTS

Of the 1371 cases in 1178 patients, 1328 cases (96.8%) were laparoscopic totally extraperitoneal repair and 43 cases (3.2%) represented other laparoscopic procedures--intraperitoneal onlay mesh or transabdominal preperitoneal techniques. There was only 1 conversion from a laparoscopic procedure to open surgery. The number of recurrent hernias was 129 (11.0%). Most of the recurrent hernias were secondary to open hernia repair. The mean operative time was 26 ± 18 minutes for unilateral hernias and 39 ± 29 minutes for bilateral hernias. The incidence of intraoperative complications was 3.8%. The overall postoperative morbidity rate was 15.3%, mainly representing seroma and pain. The recurrence rate was 0.5%.

CONCLUSIONS

If performed by experienced laparoscopic surgeons, laparoscopic totally extraperitoneal repair is an excellent mode of hernia repair for most types of inguinal hernias.

A bio-inspired swellable microneedle adhesive for mechanical interlocking with tissue

Achieving significant adhesion to soft tissues while minimizing tissue damage poses a considerable clinical challenge. Chemical-based adhesives require tissue-specific reactive chemistry, typically inducing a significant inflammatory response. Staples are fraught with limitations including high-localized tissue stress and increased risk of infection, and nerve and blood vessel damage. Here inspired by the endoparasite Pomphorhynchus laevis, which swells its proboscis to attach to its host's intestinal wall, we have developed a biphasic microneedle array that mechanically interlocks with tissue through swellable microneedle tips, achieving ~3.5-fold increase in adhesion strength compared with staples in skin graft fixation, and removal force of ~4.5 N cm(-2) from intestinal mucosal tissue. Comprising a poly(styrene)-block-poly(acrylic acid) swellable tip and non-swellable polystyrene core, conical microneedles penetrate tissue with minimal insertion force and depth, yet high adhesion strength in their swollen state. Uniquely, this design provides universal soft tissue adhesion with minimal damage, less traumatic removal, reduced risk of infection and delivery of bioactive therapeutics.

Laparoscopic or Lichtenstein repair for recurrent inguinal hernia: a meta-analysis of randomized controlled trials

BACKGROUND

There is no clear answer regarding the use of laparoscopic techniques versus the Lichtenstein method for the treatment of recurrent inguinal hernia.

OBJECTIVE

The aim of this study was to compare the outcomes of laparoscopy versus the Lichtenstein repair by a meta-analysis of available randomized controlled trials (RCTs).

METHODS

Databases, including PubMed, EMBASE, the Cochrane Library, and the Science Citation Index updated to May 2012, were searched. The main outcome measures were wound infections and haematoma, urinary retention, post-operative chronic pain and recurrence. A meta-analysis of included RCTs was performed.

RESULTS

Five RCTs, comprising a total of 427 patients, were included. Although most of the analysed outcomes were similar between groups, wound infection rates and post-operative chronic pain occurred less frequently in the laparoscopic group than in the Lichtenstein group (odds ratio: 0.28, 95% CI: 0.08-0.97; P = 0.05; odds ratio: 0.33, 95% CI: 0.17-0.68; P = 0.002, respectively).

CONCLUSION

The laparoscopic approach to the treatment of recurrent inguinal hernia is superior to the Lichtenstein hernioplasty in some aspects that affect patient satisfaction.

Internal plug mesh without fixation in laparoscopic total extraperitoneal (TEP) repair of inguinal hernias: a pilot study

PURPOSE

Mesh fixation is essential in laparoscopic total extraperitoneal (TEP) repair of inguinal hernia; however, fixation sometimes causes post-operative pain. This study investigated a novel method of laparoscopic TEP repair without mesh fixation.

METHODS

This study reviewed data from about two-hundred and forty-one laparoscopic TEP repairs on 219 patients, which were performed between December 2004 and October 2005.

RESULTS

There were no statistically significant differences in the recurrence rate, seroma formation, and hospital stay. However, the mean operation time was shorter in the internal plug mesh group than the fixation group (p = 0.009), and post-operative pain only occurred in 4 cases in the internal plug mesh group in comparison to 29 cases in the mesh fixation group (p = 0.014).

CONCLUSIONS

An internal plug mesh without fixation might reduce post-operative pain after laparoscopic TEP repair of an inguinal hernia. Internal plug mesh without fixation may be an alternative method in laparoscopic TEP repair, especially for those involving indirect hernias.

Staple versus fibrin glue fixation in laparoscopic total extraperitoneal repair of inguinal hernia: a systematic review and meta-analysis

BACKGROUND

Fixation of mesh is typically performed to minimize risk of recurrence in laparoscopic inguinal hernia repair. Mesh fixation with staples has been implicated as a cause of chronic inguinal pain. Our study aim is to compare mesh fixation using a fibrin sealant versus staple fixation in laparoscopic inguinal hernia and compare outcomes for hernia recurrence and chronic inguinal pain.

METHODS AND PROCEDURES

PubMed was searched through December 2010 by use of specific search terms. Inclusion criteria were laparoscopic total extraperitoneal repair inguinal hernia repair, and comparison of both mesh fibrin glue fixation and mesh staple fixation. Primary outcomes were inguinal hernia recurrence and chronic inguinal pain. Secondary outcomes were operative time, seroma formation, hospital stay, and time to return to normal activity. Pooled odds ratios (OR) were calculated assuming random-effects models.

RESULTS

Four studies were included in the review. A total of 662 repairs were included, of which 394 were mesh fixed by staples or tacks, versus 268 with mesh fixed by fibrin glue. There was no difference in inguinal hernia recurrence with fixation of mesh by staples/tacks versus fibrin glue [OR 2.13; 95% confidence interval (CI) 0.60-7.63]. Chronic inguinal pain (at 3 months) incidence was significantly higher with staple/tack fixation (OR 3.25; 95% CI 1.62-6.49). There was no significant difference in operative time, seroma formation, hospital stay, or time to return to normal activities.

CONCLUSIONS

The meta-analysis does not show an advantage of staple fixation of mesh over fibrin glue fixation in laparoscopic total extraperitoneal inguinal hernia repair. Because fibrin glue mesh fixation with laparoscopic inguinal hernia repair achieves similar hernia recurrence rates compared with staple/tack fixation, but decreased incidence of chronic inguinal pain, it may be the preferred technique.

Efficiency and safety of mesh fixation in laparoscopic inguinal hernia repair using n-butyl cyanoacrylate: long-term biocompatibility in over 1,300 mesh fixations

Introduction

In adult patients, most inguinal hernias are treated by implanting a prosthetic mesh. To prevent mesh dislocation and thus recurrence, different types of fixation have been proposed. In contrast to penetrating fixation known to cause acute chronic pain, adhesive fixation is becoming increasingly popular as it reduces markedly the risk of injury and chronic pain. Apart from the biological sealants (e.g., fibrin glue), surgical adhesives include a group of synthetic glues and genetically engineered protein glues. For example, cyanoacrylate is used in various medical and veterinary indications due to its fast action, excellent bonding strength and low price.

Objective

The main objective of this paper was to communicate positive results obtained using n-butyl-cyanoacrylate glue to fix prosthetic meshes in over 1,300 TAPP repairs of primary and recurrent inguinal hernias. The secondary objective was to highlight the rationale (e.g., safety) for using non-fibrin based glue in this type of procedure.

Method

We present the in vitro and in vivo data necessary for the approval of n-butyl cyanoacrylate Histoacryl^® glue. We use an equivalent glue, Glubran-2^®, to fix prosthetic meshes in 1,336 laparoscopic TAPP repairs.

Results

Standardized tests to detect sensitization, irritation, genotoxicity or systemic toxicity demonstrated the safety and biocompatibility of Histoacryl^®, which met all requirements, including those of ISO 10993. Histological long-term studies in rabbits yielded results comparable to routine suture fixations, with full integration of the mesh into the abdominal wall. The clinical results showed the following advantages: fast application of the glue, reduced postoperative pain, 0.0% infection rate, continuously low recurrence rate and shorter hospital stay. No adverse effects and no complaints were recorded.

Conclusion

The experimental and clinical data demonstrate the safe use and the excellent cost-benefit ratio of n-butyl cyanoacrylate compared with other techniques of mesh fixation.

Causes of recurrence in laparoscopic inguinal hernia repair

AIM

The analysis of possible mechanisms of repair failure is a necessary instrument and the best way to decrease the recurrence rate and improve the overall results. Avoiding historical errors and learning from the reported pitfalls and mistakes helps to standardize the relatively new laparoscopic techniques of trans-abdominal preperitoneal and total extraperitoneal.

MATERIALS AND METHODS

The video tapes of all primary laparoscopic repairs done by the author that led to recurrence were retrospectively analyzed and compared with findings at the second laparoscopic repair. A review of the available cases of recurrences occurring between 1994 and 2003 is the basis of this report.

SUMMARY

Adequate mesh size, porosity of mesh material, slitting of the mesh, correct and generous dissection of preperitoneal space and wrinkle-free placement of the mesh seem to be the more important factors in avoiding recurrence rather than strength of the material or strong penetrating fixation. Special attention should be paid to preperitoneal lipoma as a possible overlooked herniation or potential future pseudorecurrence despite nondislocated correctly positioned mesh.

CONCLUSION

Laparoscopic hernia repair is a complex but very efficient method in experienced hands. To achieve the best possible results, it requires an acceptance of a longer learning curve, structured well-mentored training and high level of standardization of the operative procedure.

Laparoscopic surgery for inguinal hernia: Current status and controversies

Repair of inguinal hernia is one of the commonest operations performed by surgeons around the world. The treatment of this common problem has seen an evolution from the pure tissue repairs to the prosthetic repairs and in the recent past to laparoscopic repair. The fact that so many hernia repairs are practiced is a testimony to the fact that probably none is distinctly superior to the other. This review assesses the current status of surgery for repair of inguinal hernia and examines the various controversial issues surrounding the subject.

Managing intra-operative complications during totally extraperitoneal repair of inguinal hernia

Laparoscopic inguinal hernia repairs are looked upon as technically demanding procedures having have a stiff ‘learning curve’ associated with its performance in terms of clinical outcome and patient's satisfaction. Complication rates have been shown to drop with increased surgical experience. The complication rate for laparoscopic repair of inguinal hernia ranges from less than 3% to as high as 20%. Complications of a totally extraperitoneal (TEP) repair include general complications that occur with any surgical procedure and anesthesia, mesh-related complications and those specific to the TEP procedure, like visceral injury, vascular injury, nerve injury and injury to the cord. Intraoperative complications can occur at every step of the operation, even though some of them are only occasionally reported. However, it is important to analyze all of them chronologically, so that we can define methods to prevent them or tackle them if they occur. Risk reduction strategies are required to improve the clinical outcome of TEP and this must be adopted for each individual surgical step.

Chronic pain after laparoscopic transabdominal preperitoneal hernia repair: a randomized comparison of light and extralight titanized polypropylene mesh

Background

The aim of this prospective, randomized, single-blinded clinical trial was to compare the incidence of chronic pain after laparoscopic transabdominal preperitoneal hernia repair (TAPP) using a 35-g/m² titanized polypropylene mesh and a 16-g/m² titanized polypropylene mesh. The reported incidence of chronic pain in patients who underwent laparoscopic hernia repair is a serious problem. The techniques of dissection, mesh fixation, and the mesh material used have all been identified as being part of the problem. Excellent biocompatibility through a unique combination of a lightweight open porous polypropylene mesh covered with a covalent-bonded titanium layer has been claimed. The aim of this study was to find out whether the titanium surface alone or the difference in material load between the two available meshes influences clinical outcomes.

Methods

Three hundred eighty patients with 466 inguinal hernias were operated on between 2002 and 2006 with the laparoscopic transabdominal preperitoneal (TAPP) technique. Mesh fixation with staples was carried out routinely. After the dissection was completed just prior to the implantation of the mesh, patients were randomized into two groups. In Group A, 250 (53.6%) inguinal hernias were repaired with a 35-g/m² titanized polypropylene mesh, and in Group B, 216 (46.4%) inguinal hernias were repaired with a 16-g/m² titanized polypropylene mesh. The primary outcome was chronic pain 3 years after surgery. The degree of pain was determined using a visual analog scale (VAS) with a range from 0 to 10. The secondary outcome was the rate of recurrence.

Results

The postoperative period of observation was at least 3 years for every patient. In both groups, 90% of the patients could be questioned and examined clinically: in Group A (Light), 5.3% of the patients and in Group B (Extralight), 1.5% of the patients suffered from chronic pain. Chronic pain was significantly more common in Group A than in Group B (p = 0.037). There was no difference with respect to the rate of recurrence: for Group A it was 3.1% and for Group B it was 2.6% (p = 0.724).

Conclusions

Chronic pain is not very common in patients who have had their inguinal hernias repaired with titanium-covered polypropylene mesh. Reducing the material load from 35 to 16 g/m² seems to further improve the biocompatibility of these meshes, thus improving the clinical outcome by reducing chronic pain to a rare event. The role of staples in causing chronic pain following inguinal hernia repair may be overestimated. There was no evidence supporting the notion that the use of the 16-g/m² titanized meshes is associated with increased recurrence rates.

A meta-analysis of randomized controlled trials of fixation versus nonfixation of mesh in laparoscopic total extraperitoneal inguinal hernia repair

BACKGROUND

Mesh fixation during laparoscopic total extraperitoneal (TEP) inguinal hernia repair is still controversial. Although many surgeons considered it necessary to fix the mesh, some published studies supported elimination of mesh fixation. Therefore, a meta-analysis based on randomized controlled trials (RCTs) was conducted to compare the effectiveness and safety of fixation versus nonfixation of mesh in TEP.

METHODS

RCTs were identified from PubMed, Embase, the Cochrane Library, SCI, and the Chinese Biomedical Literature Database (CBM). Two reviewers assessed the quality of the studies and extracted data independently. The methodological quality was evaluated according to the Cochrane Handbook 5.0.2. Statistical analysis was conducted using the Cochrane software RevMan 5.0.21.

RESULTS

Six RCTs involving 772 patients were included. The nonfixation group had advantages in length of hospital stay [MD =-0.37, 95% CI (-0.57, -0.17), p = 0.0003], operative time [MD = -4.19, 95% CI (-7.77, -0.61), p = 0.02], and costs. However, there was no statistically significant difference in hernia recurrence [OR = 2.01, 95% CI (0.37, 11.03), p = 0.42], time to return to normal activities [MD = -0.13, 95% CI (-0.45, 0.19), p = 0.43], seroma [OR = 1.25, 95% CI (0.30, 5.18), p = 0.75], and postoperative pain on postoperative day 1 [MD = -0.21, 95% CI (-0.52, 0.10), p = 0.18] and day 7 [MD = -0.11, 95% CI (-0.42, 0.20), p = 0.47].

CONCLUSIONS

Without increasing the risk of early hernia recurrence, the nonfixation of mesh in TEP appears to be a safe alternative that is associated with less costs, shorter operative time, and hospital stay for the selected patients. Further adequately powered RCTs are required to clarify whether mesh fixation is necessary for the patients with different types of hernias and larger hernia defects.

Validation of a radiographic model for the assessment of mesh migration

BACKGROUND

The natural history of laparoscopically placed mesh remains uncharacterized. Mesh migration is not infrequently discovered at reoperation and implicated as a cause of hernia recurrence, and it has also been associated with more serious complications, such as enteric and bladder erosion and fistula formation. To date, there is no noninvasive method by which to reliably assess the in-vivo behavior of laparoscopically placed mesh. In this study, we devised and validated a safe and noninvasive model, utilizing computed radiography (CR), for measuring postoperative mesh migration that may be applied to the clinical setting.

METHODS

The anatomical structures of the inguinal region were recreated using a skeletal male pelvic model. A sheet of commercially available surgical mesh, marked with three 5mm surgical clips at its medial and superior corners, was moved along the inguinal ligament wire for various random distances. The mesh displacement was measured from the model, and a CR film was obtained. The corresponding mesh displacement was then measured on the CR using two different calibration methods (calibration disk and clip measurement).

RESULTS

A total of 60 measurements were made and recorded. There were no statistically significant differences between the true (as measured from the model) and CR-measured distances of mesh migration. In comparing the two methods, only method 1 (calibration disk) showed a tendency towards a significant difference when lateral or superior displacement was measured, but correlation remained excellent (r(2) = 0.99). All other measurements showed no significant difference and excellent correlation (r(2) > 0.96). Pearson's correlation coefficients showed no significant inter-rater variability using either of these methods.

CONCLUSION

Our CR model reliably provides a noninvasive means to characterize mesh movement in the postoperative clinical setting. This should provide an instrument to facilitate future clinical evaluation of mesh migration in human trials.

Comparison of a new self-gripping mesh with other fixation methods for laparoscopic hernia repair in a rat model

BACKGROUND

Microhooks are small structures on the surface of the Progrip (PG; Sofradim Corp) mesh to ensure its anchorage in tissue. Additional fixation is not required. The aim of this animal study was to compare the strength of incorporation, foreign body reaction, and changes in material after implantation of this novel mesh with the current fixation alternatives, namely the hernia stapler (HS) and fibrin glue (FG).

STUDY DESIGN

Forty Sprague-Dawley rats were used in this two-phase, prospective randomized study. Polypropylene meshes (Parietene light; Sofradim Corp) were positioned bilaterally on the abdominal muscle. The randomized mesh fixation groups were named HS, FG, PG, and UM (unfixed mesh). Half of the rats in each group were sacrificed and analyzed 5 days after implantation, and the second half were sacrificed and analyzed after 2 months. Measured parameters were strength of incorporation, foreign-body reaction to, and potential degradation of, mesh and fixation systems.

RESULTS

After 5 days, strength of incorporation was substantially higher for PG (3.2 N/cm(2)) and HS (2.7 N/cm(2)) compared with FG (0.9 N/cm(2)) or UM (1.5 N/cm(2)). After 2 months, PG had a much greater strength of incorporation (14.8 N/cm(2)) compared with all other groups (HS 11.7 N/cm(2); FG 11.4 N/cm(2); UM 8.7 N/cm(2)). Inflammatory reactions were considerably more severe after 5 days than after 2 months. No significant differences in foreign-body reactions were found between groups. At neither time point were signs of degradation detected by scanning electron microscopy.

CONCLUSIONS

PG demonstrated a substantially stronger strength of incorporation in muscle tissue compared with other fixation systems and is an economic alternative to HS or FG. Laparoscopic mesh placement of PG requires some practice because of the microhooks. Clinical studies will have to be performed before the value of this mesh can be established for laparoscopic application.

Laparoscopic inguinal total extraperitoneal hernia repair under spinal anesthesia without mesh fixation in 1,220 hernia repairs

BACKGROUND

The need for general anesthesia and the cost and pain due to metal staples required for fixing the mesh are the major reported disadvantages of laparoscopic total extraperitoneal (TEP) hernia repair. We studied the feasibility and results of TEP done under spinal anesthesia with non-fixation of the mesh (SA-NF). This group was compared to TEP done under general anesthesia with non-fixation of the mesh (GA-NF) and repairs done under SA with fixation of the mesh (SA-F).

METHODS

A retrospective analysis was carried out in 675 patients (1,289 hernias) in whom TEP was performed. The recurrence rate, pain scores at 24 h and 1 week, hospital stay, days to resume normal activities, seroma formation, and urinary retention rates were noted.

RESULTS

A total of 1,289 TEP repairs (675 patients) were analyzed, with 636 patients (1,220 hernias) in the SA-NF group, 16 patients (27 hernias) in the GA-NF group, and 23 patients (42 hernias) in the SA-F group. Follow up ranged from 13 to 45 months. The recurrence rates, conversion rates, and complications were similar in all three groups. The mean hospital stay, days to resume normal activities, and pain scores were significantly higher in the mesh fixation (SA-F) group.

CONCLUSIONS

TEP, done under SA and without fixation of the mesh, is safe, feasible, and associated with low recurrence rates. Since this procedure does not have the disadvantages usually attributed to TEP, it can be possibly recommended as a first-line procedure, even for unilateral inguinal hernias. Further studies are needed to substantiate this.

Laparoscopic totally extraperitoneal repair of inguinal hernia: a policy of selective mesh fixation over a 10-year period

INTRODUCTION

The issue of mesh fixation in laparoscopic totally extraperitoneal (TEP) repair of inguinal hernia repairs remains unresolved. The need for fixing the mesh arises from the fear of increasing recurrence rates. However, specific complications have emerged as a result of mesh fixation.

MATERIALS AND METHODS

A retrospective analysis of 822 laparoscopic TEP hernia repairs in 634 patients over a 10-year period in a single surgical unit was performed. A policy of selective mesh fixation was followed and guidelines regarding indications of mesh fixation formulated. Recurrence rates and complications specific to mesh fixation were evaluated.

RESULTS

Mesh was fixed in only 28 of 822 repairs. There were 6 (0.7%) recurrences. No neuropathic or mesh-fixation-related complications were noted in a follow-up period ranging from 10 to 82 months.

CONCLUSIONS

Avoiding routine fixation of the mesh helps in decreasing complications and operative costs with acceptable recurrence rates. However, a policy of selective mesh fixation is advocated, based on specific indications.