Biologic and Synthetic Graft Use in Pelvic Surgery: A Review

Modified laparoscopic lateral suspension with a five-arm mesh in pelvic organ prolapse surgery

Background

Laparoscopic lateral suspension (LLS) is a laparoscopic technique used to treat pelvic organ prolapse (POP) in apical and anterior compartment defect with the use of a synthetic T-shaped mesh graft. The posterior compartment is repaired using a second mesh or a procedure along with LLS, such as posterior colporrhaphy. The aim of this study was to evaluate the clinical results of LLS for POP using a five-arm mesh instead of a T-shaped mesh graft to repair the defect of the posterior compartment in addition to the apical and anterior compartments.

Methods

Data from 37 patients with a diagnosis of advanced-stage (≥ 3) POP undergoing LLS with the use of a five-arm mesh were retrospectively analysed. Pre-operative and post-operative examinations and, surgical outcomes were determined. The results of measurements and examinations, reoperation rates, erosion rates, lower urinary tract symptoms, and complications were analysed. The Prolapse Quality of Life Questionnaire (P-QOL) was also used.

Results

The median post-operative follow-up was 20 (13–34) months. There was a significant improvement in POP-Q scores in all treated compartments, with overall objective cure rates of 94.5% for the apical compartment, 86.4% for the anterior compartment, and 91.8% for the posterior compartment. The median operative time was 96 (76–112) minutes. The median length of hospitalization was 2 (1–3) days. A significant improvement in vaginal bulge, urinary urgency, incomplete voiding, urinary frequency, and constipation was observed after surgery. The sexuality among patients increased from 13 (35.1%) preoperatively to 22 (59.4%) post-operatively. De novo stress urinary incontinence developed in 7 (18.9%) patients. The P-QOL scores improved significantly after surgery.

Conclusions

In advanced-stage POP patients, the posterior compartment damage can also be repaired in LLS with the use of a single five-arm mesh without the need for an additional procedure, and the recurrence rate can be reduced.

Case Report: Biologic graft placement with subsequent radiation therapy following radical vulvectomy for adenoid cystic carcinoma of the Bartholin's gland

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Biologic graft should be considered for defects unable to be closed primarily.

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Radiation therapy should not be a contraindication to biologic graft placement.

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Consider biologic graft placement in areas not amenable to surgical flap creation.

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Biologic grafts should be considered in gynecologic oncology patients.

Adenoid cystic carcinoma (ACC) of the Bartholins gland, first described by Klob in 1864, is a rare form of vulvar cancer comprising approximately 2–7% of all invasive vulvar lesions (Cardosi, 2001). Treatment consists of excision followed by radiation therapy (Cardosi, 2001; Anaf, 1999; Barcellini, 2020). Progression is indolent with later recurrence and metastases in comparison to other forms of vulvar cancer (Yang, 2006). Resection remains the gold standard for treatment followed by radiation therapy if margins are positive (Cardosi, 2001; Yang, 2006; Chang et al., 2019). We present a case of ACC of the Bartholins gland that underwent radical vulvectomy and Surgisis graft placement due to the extent of disease resection. Radiation therapy was then pursued due to positive margins with no wound breakdown despite this being the most common complication of vulvectomy with or without radiation therapy (Leminen et al., 2000). To our knowledge this is only the second case of Cook Biodesign graft placement after vulvectomy and first case of subsequent local radiation therapy to the area.

Long-term outcome (5-10 years) after non absorbable mesh insertion compared to partially absorbable mesh insertion for anterior vaginal wall prolapse repair

Objective:

To evaluate long-term (5-10 years) outcomes of Minimally Invasive Surgical (MIS) kit insertion with Prolift^® (non-absorbable) mesh compared to the use of Prolift M^® (partially absorbable), for anterior vaginal wall prolapse repair.

Study design:

In this retrospective study we compared women undergoing MIS kit Prolift^® insertion (n=90) vs. Prolift M^® insertion (n=79) for anterior vaginal wall prolapse repair between 2006 and 2012 at our Institution. A number of 169 women fulfilled the inclusion criteria and were included in the study.

Results:

During the study period 128 women (76%) completed full follow-up; of them 58 (73%) following MIS kit Prolift^® insertion, and 70 (88%) following MIS kit ProliftM^® insertion. There was no significant difference between the Prolift® and Prolift M^® regarding parity (3.04 vs. 2.88, p=0.506), presence of hypertension (24.1% vs. 39.1%, p=0.088), diabetes mellitus (3.4% vs. 11.6%, p=0.109), or urinary stress incontinence (39.7% vs. 47.1%, p=0.475). All participants had been diagnosed with POP grade 3 or 4 before the procedure. No significant complications during the procedure or postoperative period were identified in the study groups. The follow-up period was at least five years in duration for both groups. Both groups were comparable according to questionnaires focused on function and satisfaction.

Conclusion:

Patients undergoing MIS kit Prolift^® and Prolift M^® insertion for anterior vaginal wall prolapse repair had comparable early and late postoperative outcomes. No differences in patient's function and satisfaction between the two groups were identified. According to our findings, there is no superiority to either of the two studied mesh devices.

Abnormal vaginal microbiome associated with vaginal mesh complications

Aims

To identify differences in the vaginal microbiomes of women after transvaginal mesh (TVM) surgery for pelvic organ prolapse with and without mesh‐associated complications.

Methods

Patients with complications were eligible as cases, patients without as controls. DNA was isolated and the V1‐2 region of the 16S ribosomal RNA gene was amplified and sequenced. Overall richness was quantified using Chao1. Overall diversity was expressed as Shannon diversity and screened for group differences using analysis of variance. Multivariate differences among groups were evaluated with functions from R.

Results

We recruited 14 patients after mesh exposure, 5 after contraction, and 21 as controls. The average number of operational taxonomic unit was 74.79 (SD ± 63.91) for controls, 57.13 (SD ± 58.74) after exposures, and 92.42 (SD ± 50.01) after contractions. Total 89.6% of bacteria in controls, 86.4% in previous exposures, and 81.3% in contractions were classified as either Firmicutes, Proteobacteria, or Actinobacteria (P < .001). Veillonella spp. was more abundant in patients after contraction (P = .045). The individual microbiomes varied, and we did not detect any significant differences in richness but a trend towards higher diversity with complications.

Conclusions

The presence of Veillonella spp. could be associated with mesh contraction. Our study did not identify vaginal microbiotic dysbiosis as a factor associated with exposure. Larger cohort studies would be needed to distinguish the vaginal microbiome of women predisposed to mesh‐related complications for targeted phenotyping of patients who could benefit from TVM surgery.

The "Pelvic Harness": a skeletonized mesh implant for safe pelvic floor reconstruction

OBJECTIVES

To evaluate the feasibility, safety and surgical results of skeletonized mesh implants to form a pelvic harness for pelvic floor reconstruction surgery.

STUDY DESIGN

Patients with advanced pelvic floor prolapse were enrolled to this study. Study model was a kit mesh, reduced to 75% of the original surface area by cutting out mesh material from the central mesh body. Patients were evaluated at the end of the 1st and 6th post-operative months and interviewed at the study conclusion.

RESULTS

Ninety-five women with advanced pelvic floor prolapse had this implant. Mean follow-up duration was 9 months (6-12 months). The POP-Q point's measurements showed marked and statistically significant improvements. Bladder over-activity symptoms, fecal incontinence, pelvic pain and constipation rates were all reduced as well. No adverse effects related to the dissection or mesh implantation were marked. The first and sixth post-operative month follow-up records as well as the study conclusion interview findings were satisfactory in terms of subjective and objective cure and adverse effects occurrence.

CONCLUSION

This study data proposes that skeletonizing meshes might be safely and successfully implanted for potentially improved pelvic floor reconstruction.

Anterior six arms prolene mesh for high stage vaginal prolapse: five years follow-up

INTRODUCTION

In high stage vaginal prolapse, recurrence risk patients, anterior and apical defects need to be addressed in the same procedure. The pre-molded commercial mesh kits are expensive and not always available. Alternative effective and safe treatment ways, with lower costs are desirable.

OBJECTIVE

To present long term follow-up of patients treated with a homemade mesh shape to correct high stage prolapses.

MATERIALS AND METHODS

We describe prospectively 18 patients with anterior and apical vaginal prolapses, stages III and IV, repaired using this specific design of mesh. All patients were submitted to pre-operative clinical evaluation and urodynamics. Prolapse was classified using the pelvic organ prolapse quantification (POP-Q).

INTERVENTION

Prolapse surgery, using a six arms prolene mesh, through a single anterior vaginal incision.

OUTCOME MEASUREMENTS

POP-Q, patients satisfaction, descriptive statistical analysis.

RESULTS

Between February 2009 and Oct 2010, 18 consecutive women underwent the above-mentioned surgery. Mean age was 68 years. At a mean follow-up of 4 years (5 to 5.8 years), 16 (89%) patients were continent, mean Ba point came from +4.7cm to -2.5cm, mean C point from +2.8cm to -6.6cm and mean Bp point from +1.3 to -1.7cm. There were two (11%) objective failures, but all the patients were considered success subjectively. There were two cases of mesh vaginal extrusion.

CONCLUSIONS

The homemade six arms prolene mesh allows concomitant correction of anterior and apical prolapses, through a single anterior vaginal incision, being an effective, safe and affordable treatment option when mesh is needed.

Tissue reaction to urogynecologic meshes: effect of steroid soaking in two different mesh models

INTRODUCTION AND HYPOTHESIS

Steroid soaking may decrease mesh-triggered inflammatory reaction in tissue. We aimed to investigate the tissue reaction to a steroid-soaked mesh material and an unsoaked mesh material in the rat model.

METHODS

Neutral and steroid-soaked type I macroporous polypropylene (PP) monofilament and polyvinylidene fluoride (PVF) mesh materials were implanted on the rectus abdominis muscle of 20 mature Wistar albino rats. Animals were divided into four groups: PP mesh with steroid (PP-S), PP mesh without steroid, PVF mesh with steroid (PVF-S), and PVF mesh without steroid. The rats were killed after 12 weeks, and histologic, immunohistochemical and electron microscopic examinations were performed. For immunohistochemical analysis, polyclonal rabbit anti-mouse CD3, rabbit anti-mouse CD68, rabbit anti-mouse CD15, and rabbit anti-mouse CD34 antibodies were used for the detection of lymphocytes, macrophages, polymorphonuclear leukocyte foreign body giant cells, and fibromyocyte stem cells, respectively. Samples were stained with hematoxylin and eosin for the histologic evaluation of inflammation and with Masson's trichrome stain for the evaluation of collagen deposition. Pore size and mesh ultrastructure were evaluated by electron microscopy.

RESULTS

Expression of CD3 was lower in the PVF, PVF-S and PP-S groups, and expression of CD34 was higher in the PVF-S and PP-S groups than in the PP groups (p < 0.05). Collagen deposition was lower in the PVF, PVF-S and PP-S groups (p < 0.05). Histologically, the intensity of inflammation was lower in the PVF-S and PP-S groups than in the PP mesh group (p < 0.05). There were no significant differences among the groups in terms of pore size and mesh ultrastructure on electron microscopic examination (p > 0.05).

CONCLUSIONS

PVF mesh induces less inflammation than PP mesh, and in both mesh types steroid soaking further decreases inflammation without changing the pore size.

Incidence and risk factors for mesh erosion after laparoscopic repair of pelvic organ prolapse by lateral suspension with mesh

INTRODUCTION AND HYPOTHESIS

The objective of our study was to estimate the incidence and identify the risk factors for mesh erosion after laparoscopic repair of pelvic organ prolapse (POP) by lateral suspension with mesh.

METHODS

We conducted a nested case-control study among 480 women who underwent POP repair by laparoscopic lateral suspension with mesh from January 2004 to October 2012. Cases (n = 18) were women who showed mesh erosion following the first intervention through December 2014. Controls (n = 133) were women randomly selected from the same cohort who did not have any erosion.

RESULTS

The risk of mesh erosion was 3.8 % with a mean follow-up of 82.3 months (range 28.2 - 130.6 months). The main risk factor was the use of a type 3 mesh (macroporous with either multifilamentous or microporous components) rather than a type 1 mesh (macroporous and monofilamentous; adjusted OR 13.0, 95 % CI 1.5 - 110.6; P = 0.02). Risk factors included smoking (adjusted OR 10.4, 95 % CI 2.3 - 46.5; P < 0.01) and posterior mesh placement (adjusted OR 5.1, 95 % CI 1.2 - 21.8 P = 0.03).

CONCLUSIONS

The risk of mesh erosion is low and may be further reduced by using the appropriate mesh material, and by identifying specific patient characteristics such as tobacco use. As conventional vaginal surgery is effective for the treatment of the posterior compartment, the use of posterior mesh during laparoscopic pelvic floor repair needs to be questioned.

To mesh or not to mesh: a review of pelvic organ reconstructive surgery

Pelvic organ prolapse (POP) is a major health issue with a lifetime risk of undergoing at least one surgical intervention estimated at close to 10%. In the 1990s, the risk of reoperation after primary standard vaginal procedure was estimated to be as high as 30% to 50%. In order to reduce the risk of relapse, gynecological surgeons started to use mesh implants in pelvic organ reconstructive surgery with the emergence of new complications. Recent studies have nevertheless shown that the risk of POP recurrence requiring reoperation is lower than previously estimated, being closer to 10% rather than 30%. The development of mesh surgery - actively promoted by the marketing industry - was tremendous during the past decade, and preceded any studies supporting its benefit for our patients. Randomized trials comparing the use of mesh to native tissue repair in POP surgery have now shown better anatomical but similar functional outcomes, and meshes are associated with more complications, in particular for transvaginal mesh implants. POP is not a life-threatening condition, but a functional problem that impairs quality of life for women. The old adage "primum non nocere" is particularly appropriate when dealing with this condition which requires no treatment when asymptomatic. It is currently admitted that a certain degree of POP is physiological with aging when situated above the landmark of the hymen. Treatment should be individualized and the use of mesh needs to be selective and appropriate. Mesh implants are probably an important tool in pelvic reconstructive surgery, but the ideal implant has yet to be found. The indications for its use still require caution and discernment. This review explores the reasons behind the introduction of mesh augmentation in POP surgery, and aims to clarify the risks, benefits, and the recognized indications for its use.

Three-dimensional analysis of implanted magnetic-resonance-visible meshes

OBJECTIVE

Our primary objective was to develop relevant algorithms for quantification of mesh position and 3D shape in magnetic resonance (MR) images.

METHODS

In this proof-of-principle study, one patient with severe anterior vaginal wall prolapse was implanted with an MR-visible mesh. High-resolution MR images of the pelvis were acquired 6 weeks and 8 months postsurgery. 3D models were created using semiautomatic segmentation techniques. Conformational changes were recorded quantitatively using part-comparison analysis. An ellipticity measure is proposed to record longitudinal conformational changes in the mesh arms. The surface that is the effective reinforcement provided by the mesh is calculated using a novel methodology. The area of this surface is the effective support area (ESA).

RESULTS

MR-visible mesh was clearly outlined in the images, which allowed us to longitudinally quantify mesh configuration between 6 weeks and 8 months after implantation. No significant changes were found in mesh position, effective support area, conformation of the mesh's main body, and arm length during the period of observation. Ellipticity profiles show longitudinal conformational changes in posterior arms.

CONCLUSIONS

This paper proposes novel methodologies for a systematic 3D assessment of the position and morphology of MR-visible meshes. A novel semiautomatic tool was developed to calculate the effective area of support provided by the mesh, a potentially clinically important parameter.

Conservative treatment of intrarectal mesh migration after ventral laparoscopic rectopexy for rectal prolapse

OBJECTIVE

Ventral rectopexy is a validated treatment for rectal prolapse with a low morbidity rate but a risk of intrarectal mesh migration. The purpose of this study was to report the results of local transanal mesh excision for intrarectal mesh migration after ventral rectopexy.

METHODS

Between January 2004 and March 2011, 312 patients underwent laparoscopic ventral rectopexy in two hospitals. Six patients were treated for intrarectal mesh migration.

RESULTS

Delay between ventral rectopexy and the onset of symptoms was 53 months (4-124 months). All patients have symptoms. Imaging revealed a pelvic abscess in two cases. Intrarectal mesh migration was confirmed by anorectoscopy or clinical examination. Five patients were only treated by local transanal partial mesh excision, and one required a colostomy. Morbidity and mortality were zero. The median hospitalization time was 5 days (3-8 days). After a median postoperative follow-up period of 9 months (1-40 months), one recurrence was observed 2 months after surgery.

CONCLUSION

Local transanal mesh excision for intrarectal mesh migration after laparoscopic ventral rectopexy is a feasible conservative treatment. This simple treatment produced a cure of the pelvic inflammation and closure of the fistula without compromising a more aggressive secondary treatment which was not necessary in our series.

Evaluation of current synthetic mesh materials in pelvic organ prolapse repair

With increasing use of synthetic material in pelvic organ prolapse repair, the reporting and incidence of associated complications also have increased. The role of synthetic mesh in pelvic organ prolapse repair remains controversial and it is a therapeutic dilemma whether to continue its use in patients with poor native tissues, despite the recent public safety notification provided by the U.S. Food and Drug Administration. In this article, we review the biomaterials used in pelvic organ prolapse repair and discuss the outcomes and associated complications, paying emphasis to the benefits and the risks.

Tissue engineering as a potential alternative or adjunct to surgical reconstruction in treating pelvic organ prolapse

INTRODUCTION AND HYPOTHESIS

Cell-based tissue engineering strategies could potentially provide attractive alternatives to surgical reconstruction of native tissue or the use of surgical implants in treating pelvic organ prolapse (POP).

METHODS

Based on a search in PubMed, this review focuses on candidate cell types, scaffolds, and trophic factors used in studies examining cell-based tissue engineering strategies to treat POP, stress urinary incontinence (SUI), and the closely related field of hernias.

RESULTS

In contrast to the field of SUI, the use of cell-based tissue engineering strategies to treat POP are very sparsely explored, and only preclinical studies exist.

CONCLUSION

The available evidence suggests that the use of autologous muscle-derived cells, fibroblasts, or mesenchymal stem cells seeded on biocompatible, degradable, and potentially growth-promoting scaffolds could be an alternative to surgical reconstruction of native tissue or the use of conventional implants in treating POP. However, the vagina is a complex organ with great demands of functionality, and the perfect match of scaffold, cell, and trophic factor has yet to be found and tested in preclinical studies. Important issues such as safety and economy must also be addressed before this approach is ready for clinical studies.

Tissue engineering as a potential alternative or adjunct to surgical reconstruction in treating pelvic organ prolapse

INTRODUCTION AND HYPOTHESIS

Cell-based tissue engineering strategies could potentially provide attractive alternatives to surgical reconstruction of native tissue or the use of surgical implants in treating pelvic organ prolapse (POP).

METHODS

Based on a search in PubMed, this review focuses on candidate cell types, scaffolds, and trophic factors used in studies examining cell-based tissue engineering strategies to treat POP, stress urinary incontinence (SUI), and the closely related field of hernias.

RESULTS

In contrast to the field of SUI, the use of cell-based tissue engineering strategies to treat POP are very sparsely explored, and only preclinical studies exist.

CONCLUSION

The available evidence suggests that the use of autologous muscle-derived cells, fibroblasts, or mesenchymal stem cells seeded on biocompatible, degradable, and potentially growth-promoting scaffolds could be an alternative to surgical reconstruction of native tissue or the use of conventional implants in treating POP. However, the vagina is a complex organ with great demands of functionality, and the perfect match of scaffold, cell, and trophic factor has yet to be found and tested in preclinical studies. Important issues such as safety and economy must also be addressed before this approach is ready for clinical studies.

Effect of enzymatic degradation on the mechanical properties of biological scaffold materials

BACKGROUND

Biological scaffolds must support a complex balance of resisting enzymatic degradation while promoting tissue remodeling. Thus, the purpose of this study was to evaluate the effects of in vitro enzymatic exposure on the mechanical properties of biological scaffolds. It was hypothesized that exposure to an enzyme solution would result in decreased tensile strength and that crosslinked scaffolds would resist enzymatic degradation more effectively than noncrosslinked scaffolds.

METHODS

Nine scaffolds were evaluated (four porcine dermis: Permacol™, CollaMend™, Strattice™, XenMatrix™; two human dermis: AlloMax™, FlexHD(®); two bovine pericardium: Veritas(®), PeriGuard(®); and one porcine small intestine submucosa: Surgisis™). Ten specimens (n = 10) were hydrated in saline at 37 °C and subjected to uniaxial testing to establish baseline properties. 50 specimens (n = 50) were incubated in collagenase solution at 37 °C for 2, 6, 12, 24, or 30 h (n = 10 each group) followed by uniaxial tensile testing.

RESULTS

Tensile strength was significantly reduced after 30 h for CollaMend™, AlloMax™, Veritas(®), Strattice™, XenMatrix™, Permacol™, and FlexHD(®) (p < 0.01), while PeriGuard(®) demonstrated a slight increase in tensile strength (p = 0.0188). Crosslinked bovine pericardium (PeriGuard(®)) maintained greater tensile strength than noncrosslinked bovine pericardium (Veritas(®)) throughout all exposure periods (p < 0.0001). Similarly, crosslinked porcine dermis (Permacol™) maintained greater tensile strength than noncrosslinked porcine dermis (Strattice™ and XenMatrix™) throughout all exposure periods (p < 0.0001).

CONCLUSIONS

Materials that deteriorate rapidly after in vitro enzymatic exposure may also deteriorate rapidly in vivo, particularly when exposed to a wound environment with elevated levels of matrix metalloproteinases. Permacol™, CollaMend™, Strattice™, FlexHD(®), and PeriGuard(®) survived the longest incubation period (30 h) and withstood mechanical testing. XenMatrix™, AlloMax™, Veritas(®), and Surgisis™ degraded more quickly and did not survive the longer exposure periods. Scaffolds that maintain strength characteristics after in vitro collagenase exposure may be advantageous for long-term hernia repair scenarios where elevated enzyme levels are expected.

Selective management of the urethra at time of pelvic organ prolapse repair: an assessment of postoperative incontinence and patient satisfaction

PURPOSE

Management of the urethra in women without stress urinary incontinence during pelvic organ prolapse repair can be approached selectively or with a prophylactic suburethral sling. We report on patient satisfaction and outcomes in patients who underwent selective urethral management during pelvic organ prolapse repair.

MATERIALS AND METHODS

Patients undergoing repair of advanced apical and/or anterior compartment pelvic organ prolapse underwent prolapse reduction to screen for stress urinary incontinence. Patients with clinical, occult and urodynamic stress urinary incontinence underwent a sling procedure. Those without stress urinary incontinence did not undergo sling surgery. Patients completed responses to the UDI-6 (Urogenital Distress Inventory, PGI-I (Patient Global Impression of Improvement) and MESA (Medical, Epidemiological, and Social Aspects of Aging). Cost analysis of selective urethral management was completed.

RESULTS

A total of 42 patients met the study inclusion criteria and 30 completed responses to all questionnaires. Patients were separated into prolapse repair only (14) and prolapse repair with sling (16) groups. In the prolapse repair only group 1 patient required a subsequent sling. Mean UDI-6, MESA urge and MESA stress scores were 3.71, 1.29 and 3.14 in the prolapse repair only group, and 2.31 (p=0.219), 2.69 (p=0.244) and 3.00 (p=0.918) in the prolapse repair with sling group, respectively. The PGI-I revealed no statistical difference between the groups. A total cost savings of $55,804 was achieved using selective urethral management.

CONCLUSIONS

Patients undergoing prolapse repair only have continence and satisfaction outcomes that appear equivalent to those who underwent concomitant prolapse repair and sling. The decision to perform a concomitant sling at the time of prolapse repair should be tailored to the patient.

Fresh muscle fiber fragments on a scaffold in rats-a new concept in urogynecology?

OBJECTIVE

To investigate if a synthetic, biodegradable scaffold with either autologous in vitro cultured muscle-derived cells or autologous fresh muscle fiber fragments could be used for tissue repair.

STUDY DESIGN

Twenty scaffolds with muscle-derived cells and 20 scaffolds with muscle fiber fragments were implanted subcutaneously on the abdomen of rats, 2 in each rat, and examined after 3 weeks (10 of each preparation) and 8 weeks (10 of each preparation). Immonohistochemistry and histopathology was undertaken for assessment of growth pattern and biocompatibility, respectively.

RESULTS

At 3 weeks, both muscle-derived cells and muscle fiber fragments could be identified. At 8 weeks, the muscle fiber fragments generated fragmented, striated muscle tissue in 6 of 10 explants, whereas the muscle-derived cells and all scaffolds had vanished.

CONCLUSION

Autologous fresh muscle fiber fragments on a biodegradable scaffold seem useful for tissue repair. This study introduces a promising new concept with possible implications for the surgical reconstruction of pelvic organ prolapse.

Assessment of the biocompatibility of two novel, bionanocomposite scaffolds in a rodent model

Two novel, bionanocomposite scaffolds were evaluated in a rodent model over the course of three months to determine whether these scaffolds possessed adequate biocompatibility characteristics to warrant further evaluation as possible tissue reconstruction scaffolds. These bionanocomposite scaffolds were comprised of amine-functionalized gold nanoparticles (AuNP) or silicon carbide nanowires (SiCNW) crosslinked to an acellular porcine diaphragm tendon. It was hypothesized that the addition of nanomaterials to the porcine tendon would also improve its biocompatibility by imparting a nanostructured surface. As early as seven days after implantation, both types of bionanocomposite scaffolds displayed evidence of granulation tissue and the beginning of scaffold remodeling with new collagen deposited by the host, and by ninety-seven days the bionanocomposite scaffolds were completely remodeled with no evidence of any adverse host tissue reaction or scar tissue formation. The AuNP bionanocomposite scaffolds exhibited accelerated scaffold remodeling compared to the SiCNW scaffolds.

Short-range clinical, dynamic magnetic resonance imaging and P-QOL questionnaire results after mesh repair in female pelvic organ prolapse

OBJECTIVE

To evaluate clinical, quality-of-life (QoL) and dynamic magnetic resonance imaging (dMRI) results in patients with pelvic organ prolapse (POP) preoperatively, and 4 and 12 weeks after anterior and/or posterior mesh repair.

STUDY DESIGN

Thirty-six patients (mean age 65 years) with symptomatic pelvic floor descent underwent mesh repair. The prolapse was quantified using the POP-Q system. Before surgery as well as 4 and 12 weeks after surgery, the pelvic organ positions were measured on dynamic magnetic resonance imaging during Valsalva manoeuvre in relation to the pubococcygeal and mid-pubic lines to assess surgery outcome. Patients also completed the P-QOL questionnaire to evaluate subjective changes at each visit.

RESULTS

Four and 12 weeks after surgery patients showed improvement of the POP on clinical examination and on dynamic MRI. The latter demonstrated high significance (p<0.001) especially in bladder and vaginal cuff/cervix positions during maximal straining. All quality-of-life domains and some symptom questions of the P-QOL questionnaire significantly improved (p<0.05) 12 weeks after surgery.

CONCLUSION

Significant anatomical and quality-of-life improvement was demonstrated after anterior and/or posterior mesh repair for POP using dynamic MRI and the P-QOL questionnaire.

Tissue-engineered conduit using urine-derived stem cells seeded bacterial cellulose polymer in urinary reconstruction and diversion

The objective of this study was to generate bacterial cellulose (BC) scaffolds seeded with human urine-derived stem cells (USC) to form a tissue-engineered conduit for use in urinary diversion. Microporous BC scaffolds were synthesized and USC were induced to differentiate into urothelial and smooth muscle cells (SMC). Induced USC (10(6) cells/cm(2)) were seeded onto BC under static and 3D dynamic (10 or 40 RPM) conditions and cultured for 2 weeks. The urothelial cells and SMC derived from USC formed multilayers on the BC scaffold surface, and some cells infiltrated into the scaffold. The urothelium derived from USC differentiation expressed urothelial markers (uroplakin Ia and AE1/AE3) and the SMC expressed SMC markers (α-smooth muscle actin and desmin). In addition, USC/BC scaffold constructs were implanted into athymic mice, and the cells were tracked using immunohistochemical staining for human nuclear antigen. In vivo, the cells appeared to differentiate and express urothelial and SMC markers. In conclusion, porous BC scaffolds allow 3 dimensional growth of USC, leading to formation of a multilayered urothelium and cell-matrix infiltration. Thus, cell-seeded BC scaffolds hold promise for use in tissue-engineered urinary conduits for urinary reconstruction.

Use of vaginal mesh in the face of recent FDA warnings and litigation

Choosing to use mesh in vaginal reconstructive surgery for pelvic organ prolapse or stress urinary incontinence is perplexing in the face of recent US Food and Drug Administration (FDA) warnings. In October 2008, the FDA alerted practitioners to complications associated with transvaginal placement of surgical mesh. Litigation is another concern. A Google search of "transvaginal mesh" results in numerous hits for plaintiff attorneys seeking patients with complications related to use of mesh. In light of a recent decision by the US Supreme Court and strategies by manufactures of medical devices to escape liability, it is imperative that gynecologic surgeons using transvaginal mesh document proper informed consent in the medical records. The purpose of this commentary is not to deter gynecologic surgeons from using transvaginal mesh when appropriate, but to provide an overview of current medical-legal controversies and stress the importance of documenting informed consent.