This chapter should be cited as follows:
Update due

Materials for Reconstructive Gynecologic Surgery

Authors

INTRODUCTION

Reconstructive gynecologic surgeons face daily decisions regarding surgical materials. There is no currently available ideal reconstructive surgical material. Such a material would be biocompatible, appropriately strong and durable, cost-efficient, and easy to use. This chapter provides a broad overview of the properties and clinical performance of currently available reconstructive materials in gynecologic surgery. The properties of individual sutures are not reviewed here.

ENDOGENOUS TISSUES FOR RECONSTRUCTIVE SURGERY

As illustrated in Table 1,1, 2, 3, 4, 5, 6, 7, 8, 9, 10 all honest clinical series reporting repair of pelvic organ prolapse show (1) some outright failures and (2) deterioration of initially good outcomes over time. Such clinical observations have encouraged surgeons to enhance their outcomes by supplementing their repairs with exogenous materials.

 

Table 1. Objective success rates of pelvic organ prolapse repair procedures using endogenous tissues


Author, Year

Procedure

No. Patients

Follow-Up

Outcome (Objective)

Silva, 20061

Uterosacral ligament suspension

72Mean 5 years85% no recurrence of prolapse 
Amundsen, 20032

Uterosacral ligament suspension

336-43 months82% no prolapse 

Tulikangas, 20013

Enterocele repair

54

6–29 months

61% no prolapse

Weber, 20014

Anterior colporrhaphy

33

Median 23 months

30% no prolapse

Shull, 20005

Uterosacral ligament suspension

298

Mean 1 year

87% no support defects

Comiter, 19996

Transvaginal culdosuspension

100

6–35 months

96% no recurrence of prolapse

Porter, 19997

Rectocele repair

89

>6 months

82% no prolapse

Cundiff, 19988

Rectocele repair

69

12 months

88% no prolapse

Paraiso, 19969

Sacrospinous ligament suspension

243

Mean 74 months

58% no support defects

Shull, 199210

Sacrospinous ligament suspension

81

2–5 years

65% no prolapse

 

The logical reconstructive materials to consider are the patient’s own tissues. For many years, gynecologic surgeons have relied on a variety of endogenous materials, including uterosacral ligaments, pelvic fascia, skin, muscle, and locally available connective tissue. These tissues may be used in their current location (e.g., uterosacral ligament suspension of vaginal apex) or moved to a new location for an alternative use (rectus fascia for suburethral sling). These materials are biocompatible and easy to use. The scientific evidence for their long-term durability varies. There are no randomized clinical trials comparing endogenous sources with other materials for reconstructive gynecologic surgery.

The uterosacral ligaments are probably the most used endogenous material for vaginal suspension. Every hysterectomy and many posthysterectomy vaginal support techniques rely on these native tissues. Several authors have studied the histologic components of this tissue, which is found to be composed of elastic, collagen, and smooth muscle fibers with scattered blood vessels.11 The term uterosacral ligament is a misnomer because these are not “ligaments” in any traditional sense given their composition of irregular connective tissue and abundant smooth muscle with its attendant autonomic nerve supply. Observant surgeons recognize how fleeting their form is when they are cut at the time of surgery. Their ligamentous appearance is secondary only to the anatomic tension of their environment. Surgeons selectively acknowledge the innervation of the uterosacral ligaments. Most commonly, these structures are transected and sewn without thought to the neural consequences. Certain surgical procedures use the opposite approach. During procedures to ablate midline pelvic pain, the uterosacral ligaments are transected or destroyed without regard to long-term vaginal support.

Vaginal fascia has been discussed in gynecologic operating rooms for more than 100 years, typically during anterior colporrhaphy. The histologic components of this material have been studied by Weber and Walters,12 who examined full-thickness sections of the bladder and vagina from autopsy specimens. Histologic examination confirmed that there is no vaginal “fascia”; rather the tissue between the vaginal mucosa and the bladder muscularis consists only of vaginal lamina propria and vaginal muscularis (Fig. 1). This layer is plicated during traditional anterior colporrhaphy. The histologic components of this tissue may help explain the relatively low anatomic success rates of anterior colporrhaphy. A layer that contains bladder adventitia and muscularis does not have the optimal biomechanical properties for long-term, durable anterior vaginal wall support. At the very least, this material is different from traditional fascia (rectus or fascia lata) and should not be considered to have similar biomechanical properties.

Fig. 1. Histology of endopelvic fascia. (From Weber AM, Walters MD: Anterior vaginal prolapse: Review of anatomy and techniques of surgical repair. Am J Obstet Gynecol 89:2, 1997.)

Repair of the posterior vaginal wall is a commonly performed gynecologic procedure. The most common material for this repair is the native rectovaginal fascia. There are no large case series that report the sufficiency of this tissue for its intended purpose. Experts commonly discuss the untoward side effects of posterior vaginal surgery without focus on anatomic recurrence of poor support. The exact histologic nature of the rectovaginal fascia has been the subject of some debate. One study found that the rectovaginal fascia consisted mainly of collagenous fibers13 and did not contain muscle cells (Fig. 2). In contrast, Milley and Nichols14 mentioned the presence of smooth muscle cells within the fascia. It may be that those muscle fibers originate from the external longitudinal muscle layer of the rectum.15 All authors agree that nerves of the hypogastric plexus run in the ventrolateral junction of the fascia with rectum. Surgical techniques that rely on this layer for posterior wall support conceivably could disable the delicate neuromusclar function of the rectovaginal axis. Techniques that document good efficacy with less dissection or plication7, 8, 16 may be preferable to traditional full-length colporrhaphy techniques.17, 18

The vaginal wall is also known to be a pliable, readily available surgical tissue. This tissue has been used for patch slings and vaginal repairs. It is unsuitable for these purposes because it does not have the biomechanical properties to resist stretching.19 This fact is easily appreciated by anyone who has witnessed vaginal birth during which the vaginal skin widely dilates to accommodate the emerging fetus. Similarly, skin throughout the body has phenomenal properties of stretch, which makes it unsuitable for long-term support.

Fig. 2. Rectovaginal fascia. (From Nichols DH, Randall CL [eds]: Vaginal Surgery, p 38. 4th ed. Baltimore, Williams & Wilkins, 1996.)

Autologous rectus fascia seems to be an ideal material for fascial reinforcement. This tissue is used commonly for suburethral sling and occasionally is used for sacrocolpopexy. Rectus fascia is biocompatible, strong, and appropriately pliable. Also it is readily available, although the amount harvested is directly related to the risk of incisional hernia. Despite its widespread use in suburethral slings and sacrocolpopexy, the rate of failure of this material is not well known. The surgeon would want this material to remodel to gain strength and appropriate vascularity. FitzGerald and coworkers20 reported on the histologic appearance of rectus fascia used for suburethral slings and found that after implantation there was fibroblast proliferation, neovascularization, and remodeling of the fascia graft. Some linear orientation of connective tissue and fibroblasts occurred, probably along the lines of force on the graft (Fig. 3). A randomized trial comparing materials in this area is needed.

Fig. 3. Fate of rectus fascia after implantation. (From Fitzgerald MP, Mollenhauer J, Brubaker L: The fate of rectus fascia suburethral sling. Am J Obstet Gynecol 183:964, 2000.)

Another source of endogenous fascia is fascia lata, typically harvested through a lateral incision in the thigh. This material is strong, durable, and readily available. One report of long-term problems after fascia lata harvest suggests caution, especially with increasing age. Walters and associates21 found that among 55 patients 2 years after fascia lata harvest, 25 (46%) had subjective complaints, including discomfort, weakness, lateral thigh bulge, or unacceptable incisional cosmesis. The histologic fate of fascia lata after implantation has not been reported.

There are additional, more experimental native tissues being considered for surgical use. Bioengineering and cell culture techniques have used novel techniques to harvest material from the patient, expand and enhance the tissue, and replace it in a clinically useful manner. Such tissue techniques include culture of muscle cells,22 ear chondroblasts,23 and entire bladder wall.24 Although these are not currently ready for routine clinical use, this area of investigation is expanding rapidly.

DONOR BIOMATERIALS (ALLOGRAFTS AND XENOGRAFTS)

Clinical failures have tempted surgeons to consider adjunctive or alternative materials. The source of biologic materials is typically cadavers or animals. Although the use of cadaver tissue sources per se is not new, harvesting and processing fascia for gynecologic reconstruction is a more recent development. These human cadaver materials have an increased likelihood of biocompatibility, although there is some concern about immunogenicity and disease transmission.

Cadaver fascia is supplied commercially, typically in association with a tissue bank. Commercial processing of the native fascia varies significantly, and the steps involved are often confidential. The goals of processing include sterilization (bacterial and viral) and removal of immunogenic cellular components. Clinical case series are inconclusive regarding the use of cadaver fascia for gynecologic reconstruction. This material saves time and morbidity of harvesting. FitzGerald and associates25 reported concerns, however, about excess failure rates compared with historical rectus fascia controls in an early case series. With continued follow-up, a failure rate of 81% was reported for donor fascia sacrocolpopexies and of 52% for donor fascia suburethral slings.26 A volley of case series has reported successes and failures, suggesting that specific steps in the processing and preparation of the tissue may be an important factor. One case series mentioned fascia allograft erosion as a relatively frequent complication of suburethral sling and sacrocolpopexy procedures using this material.27Table 2 is a summary of case series and highlights the preparation methods and method of reporting success rates.26, 28, 29, 30, 31, 32, 33, 34, 35, 36 In favorable reports, there is a paucity of objective outcome data.

 

Table 2. Surgical outcomes of sling procedures using cadaver donor fascia


Author, Year

N, Tissue Processing

How Success Determined

Outcome

O’Reilly, 200228

121, Fresh frozen/freeze-dried

Subjective

78% success

FitzGerald, 200226

27, Freeze-dried, irradiated

Subjective/objective

48% success

Carbone, 200129

154, Freeze-dried, irradiated

Subjective

62% success

Huang, 200130

18, Solvent-dehydrated, irradiated

Subjective

72% success

Soergel, 200131

12, Freeze-dried, irradiated

Objective (urodynamics)

33% cured

Amundsen, 200032

104, Freeze-dried

Subjective

87% success

Elliott, 200033

26, Solvent-dehydrated, irradiated

Subjective

96% cured/improved

Brown, 200034

121, Processing not stated

Subjective

74% cured

Wright, 199835

59, Freeze-dried

Subjective

98% success

Handa,199636

14, Fresh frozen/freeze-dried

Objective (urodynamics)

79% cure

 

The use of human dura mater allografts is limited to historical interest because of concerns about transmission of slow-virus neurologic diseases. These concerns have limited the use of this material, although there has never been a report of viral disease transmission from fascia transplantation in gynecologic surgery.

Several suppliers now market processed human cadaver skin as a material for reconstructive surgery. Cadaver skin may be processed to preserve the acellular dermal matrix with the intent of enhancing repopulation by endogenous host cells. These materials are approved by the Food and Drug Administration for dermal replacement but have not been tested or proved for reconstructive gynecologic surgery. Cadaver skin seems to be a viable technology and is likely to be a worthwhile source of tissue, although its exact role has yet to be established. Pessimists expect this line of investigation to produce tissue with biomechanical properties similar to skin, which would not be sufficient for prolapse repair. Marketing materials promise the tissue is “quickly revascularized and repopulated with cell populations of the patient’s own tissues.” Optimists believe that cellular ingrowth would result in enhanced strength suitable for reconstructive efforts. Case series are being reported before testing of efficacy in randomized clinical trials (Table 3).37, 38, 39, 40, 41, 42 Nonhuman sources for dermal tissue also have been investigated. Processed porcine skin has been implanted without the benefit of randomized clinical trials. Case reports and patient series offer only anecdotal outcome data (see Table 3).37, 38, 39, 40, 41, 42 Given the porcine source, religious prohibitions limit the use of this material in some patients.

 

Table 3. Success rates of procedures using processed dermis or small intestinal submucosa*


Author, Year

N, Tissue, Procedure

Follow-Up

How Outcome Assessed

Outcome

Dambros, 200137

30, Porcine small intestinal submucosa, sling

1–13 months

Subjectively

93% cured

Arunkalaivanan, 200138

46, Porcine dermis, sling

>6 months

Subjectively/objectively

83% cured

Deprest, 200139

30, Porcine dermis, sacrocolpopexy

3–10 months

Objectively

100% success

Myers, 200140

6, Human cadaver dermis, cystocele repair

6–24 months

Objectively

100% cure

Edwards, 200041

20, Porcine dermis, sling

3 months

Subjectively

100% cure

Kohli, 200042

40, Human cadaver dermis, rectocele repair

Mean 8 months

Objectively

97% cured


* Derived from selected abstracts.

 

Similarly, intestinal submucosa has been obtained from canine and porcine sources. Nonhuman experiments showed that the tissue “becomes completely incorporated at 4 weeks.”43 Although this finding superficially suggests biocompatability, it also may represent efficient biodegradation. It is likely that successful tissue grafts undergo some degradation, but it seems essential that remodeling and reconstruction occur before complete tissue loss. As with other materials, clinical efficacy has not been well documented apart from published abstracts (see Table 3).37, 38, 39, 40, 41, 42

SYNTHETIC GRAFT MATERIALS

Native tissues have tremendous advantages and should be used whenever they are likely to accomplish the surgical reconstruction goals. As all surgeons are aware, however, the strength of native tissues can be insufficient. It is tempting to substitute stronger, more durable materials to enhance outcomes. One high-quality randomized trial compared inguinal hernia repair with synthetic mesh with careful repair of endogenous fascia using permanent sutures.44 There were high recurrence rates in both groups but an excess recurrence rate when sutures only were used without additional mesh (sutures 43% versus mesh 24%). This study also compared these materials for repeat hernia repair. The difference was more striking with a 58% recurrence for sutures only versus 20% with mesh. Even healthy endogenous materials may have insufficient biomechanical properties to compensate for abnormal physiology.

Reconstruction has long depended on synthetic materials, and a large variety of synthetic materials are available for use by gynecologic surgeons. The ideal surgical mesh would be chemically inert, biologically inactive, strong, flexible, convenient, and cheap—this ideal mesh currently does not exist. Available meshes differ as follows:

  1. Composition of component fibers: Mesh fibers are either monofilament or multifilament and composed of either absorbable or permanent materials.
  2. Their pore size (Fig. 4): Theoretically, multifilament mesh interfiber pores are large enough to allow bacteria to enter but too small to allow macrophages to enter to combat infection.45
  3. Their stiffness: The flexibility of a mesh is related to the pore size and fiber composition. Marlex is stronger and stiffer than Mersilene.46 Expert opinion holds that stiffer meshes are more prone to erosion through the vagina.47

Fig. 4. Pore configuration in commonly used meshes. (From Iglesia DB, Fenner DE, Brubaker L: The use of mesh in gynecologic surgery. Int Urogynecol J Pelvic Floor Dysfunct 8:105, 1997.)

A systematic review of studies published over the past 60 years aimed to look specifically at the use of graft in transvaginal pelvic organ prolapse repair. It concluded that the data in the current literature are insufficient to allow for a complete assessment of anatomic or symptomatic efficacy of graft use in transvaginal prolapse repair.48 In addition, no particular material has proved superior to any other. Table 4 shows outcomes of transvaginal repair with graft versus native tissue. There is no study (analogous to the hernia study) that shows which patient group benefits from the use of synthetic mesh. In October 2008, the FDA put out a public health notification entitled "Serious Complications Associated with Transvaginal Placement of Surgical Mesh in Repair of Pelvic Organ Prolapse and Stress Urinary Incontinence."  In it they state that physicians should obtain specialized training for each mesh placement technique and be aware of its risks. They also state that physicians should be vigilant for potential adverse events from the mesh, especially erosion and infection.49   Surgeons must develop their own philosophy about synthetic materials based on their own clinical outcomes (efficacy and complications), costs, and preferred route of surgery.

 

Table 4. Outcomes of graft versus native tissue for transvaginal prolapse repair

Author, Year

Graft (n)

Native Tissue (control)  

Mean Follow-Up

Anatomic Failure (%)

Hiltunen, 200750

Polypropylene (105)

97

12 months

Polypropylene (7)

Control (39)

Meschia, 200751

Pelvichol (100)

100

12 months

Pelvichol (7)

Control (19)

Paraiso, 200652

Fortagen (31)

374–33 months

Fortagen (46)

Control (14)

Gandhi, 200553

Tutoplast (76)

78

Median 13 months

Tutoplast (21)

Control (30)

Sand, 200154

Vicryl mesh (73)

7012 months

Vicryl mesh (9)

Control (10) 

Weber, 200155

Vicryl mesh (35)

35

Median 23 months

Vicryl mesh (58)

Control (70)

 

During vaginal surgery, most surgeons are reluctant to place mesh for supportive repair of vaginal walls, citing many anecdotal reports of erosion and rejection secondary to potential contamination by vaginal organisms. Placement of synthetic sling materials through the bacteria-laden vagina has seen several rises and falls in popularity. Young and colleagues56 reported 5-year success with Mersilene slings. A persistent but acceptable materials problem rate is reported. Newer sling developments attempt to shield the synthetic sling from the bacterial contamination of the vagina. Reliable long-term data regarding the fate of this material for this indication are not yet available for this technique. Synthetic meshes are used widely for sacrocolpopexy, despite a persistent rate of foreign body erosion and rejection that occasionally requires reoperation.

Absorbable meshes are poorly suited for long-term reconstruction and are not discussed further in this chapter. The permanent meshes currently available in the United States are briefly considered in alphabetical order by chemical composition (Table 5).

 

Table 5. Popular synthetic meshes used in reconstructive pelvic surgery


Fiber Composition

Trade Name (Manufacturer)

Type

Expanded polytetrafluoroethylene

Gore-Tex (WL Gore, Flagstaff, AZ)

Multifilament, nonabsorbable

Polyethylene terephthalate

Mersilene (Ethicon, Somerville, NJ)

Multifilament, nonabsorbable

Polyglactin 910

Vicryl (Ethicon, Somerville, NJ)

Multifilament, absorbable

Polypropylene

Marlex (CR Bard, Branston, NJ)

Monofilament, nonabsorbable

Prolene (Ethicon, Somerville, NJ)

 

Mesh preparation chemical polymers are manufactured into filaments that create the individual fibers (monofilament) or yarns (multifilament). These fibers or yarns ultimately are woven in to mesh material that is unique to each brand-name mesh. Polypropylene is used to create Prolene, Marlex, and Surgipro meshes. Prolene is also a monofilament mesh with macropores. In its typical mesh formation, it is stiff, although there is additional flexibility in its preparation for use as a transvaginal tape. This highlights the difference between the chemical composition of the fiber itself and the gross properties when those fibers have additional processing and gross physical arrangement. Marlex is stiff, macroporous mesh with irregular pore sizes. It is probably poorly suited to placement on flexible body surfaces, such as the vagina.

Polyethylene terephthalate is the material that is woven to compose Mersilene mesh. Typically this mesh is prepared in a hexagonal weave with the use of multifiber filaments. It is a macroporous mesh with directionality that can be shown easily by pulling the mesh by its width versus its length. This gross characteristic is important in determining proper orientation to limit mesh stretch after reconstructive surgery.

Expanded polytetrafluoroethylene polymers are used to form a Gore-Tex mesh. Because there is no weaving involved, this mesh has a smaller pore size than either Mersilene or Prolene. This small pore size may contribute to the fact that fibrocollagenous infiltration of Gore-Tex mesh does not occur after implantation, and minimal inflammatory response to the mesh occurs.57, 58

There is a negative side to the use of synthetic meshes in the pelvis. Although mesh is believed to augment surgical success rates, complications related to rejection and erosions are significant. In the course of 40 years of synthetic use, erosions into the urinary tract, bowel (large and small), and vagina have been reported (Table 6).56, 59, 60, 61, 62, 63, 64 Symptoms of mesh erosion typically include a persistent vaginal discharge that may be blood-tinged at times. More commonly, mesh exposure is detected when the patient is asymptomatic. One case report details asymptomatic rectal erosion and ultimate graft passage without sequelae (Fig. 5). Early efforts at full extirpation are probably overzealous and should be avoided. Expert opinion suggests that in the absence of sinister symptoms, early mesh erosions can be managed conservatively with periodic observation. A few surgeons have reported techniques for management of mesh complications,61, 65 including transvaginal revision, transvaginal removal, laparotomy, and laparoscopy with removal.

 

Table 6. Mesh complication rates from selected surgical case series reporting complications resulting from use of synthetic mesh


Author, Year

Mesh Type

Surgical Procedure

Complications

Bodelsson, 200259

Prolene

Suburethral sling (TVT)

2% mesh erosion

Young, 200156

Mersilene

Suburethral sling

4% vaginal erosion

Visco, 200160

Mersilene, Gore-tex

Sacrocolpo(perineo)pexy

5% mesh erosion

Kohli, 199861

Marlex, Mersilene

Sacrocopopexy

12% mesh erosion

Barbalias, 199762

Gore-tex

Suburethral sling

8% vaginal erosion

Drutz, 199063

Marlex

Suburethral sling

6% vaginal erosion

Morgan, 198564

Marlex

Suburethral sling

6% urethral erosions, 1% urethral transactions, 2% sinus tracts


TVT, tension-free vaginal tape.

 

Fig. 5. Graft in rectum. (From Kenton K, Woods M, Brubaker L: Uncomplicated rectal passage of Gore-Tex graft. Am J Obstet Gynecol 187:233, 2002.)

Graft complications can occur many years after placement. When a mature graft appears, expert opinion suggests that it is unlikely that trimming visible graft would result in a long-term solution. It is rarely necessary, however, to remove every remnant of graft from delicate areas, such as the presacral space, to resolve symptoms associated with erosion.

The patient may ask about her risk of prolapse recurrence when the graft is removed. The data are scant, although experts believe that the inflammatory reaction related to the graft rejection and erosion seems to take the place of the graft, and repeat reconstruction is rarely necessary.

Occasionally a patient forgets that she has had mesh placed during her surgery. When that mesh is detected with an imaging modality, exploratory surgery is often recommended. Typically there is an oncologic concern of malignancy in the pelvis, most commonly after sacrocolpopexy. The consultation of a reconstructive pelvic surgeon can save unnecessary laparotomy.

There are general principles guiding the use of synthetics in reconstructive gynecology. It is prudent to avoid synthetics when viable alternatives are available. If synthetics are deemed appropriate, it is wise to limit the amount of graft used and to ensure that the materials of the surgery are balanced (i.e., permanent materials for mesh and suture rather than a materials mismatch, such as permanent mesh with a rapidly absorbable suture).

Isolated reports of medical concerns with gynecologic mesh placement have appeared in the rheumatologic literature. One case report suggested a possible link between exacerbations of rheumatologic conditions and the use of synthetic mesh.66

METAL

Metal tacks, staples, and other fixation devices are available, but these are rarely needed given the strength and durability of less troublesome materials. Such metallic items fare poorly in the dynamic ecosystem of the pelvis, where the tissues require some mobility and flexibility. Case reports abound of metal present in unauthorized pelvic viscera, including the vagina, bladder, and bowel (Fig. 6),67 and use of bone anchors to anchor suburethral slings has been associated with pubic osteomyelitis.68

Fig. 6. Tacks in bladder. (From Kenton K, Fitzgerald MP, Brubaker L: Erosion of multiple foreign bodies after laparoscopic colposuspension. Am J Obstet Gynecol 187:252, 2002.)

SUMMARY

Knowledge of available surgical materials in reconstructive gynecologic surgery is important for surgeons and patients. Wise choices facilitate and enhance reconstructive surgery. New materials or technologies that have not been scrutinized in appropriate clinical trials risks excess failure rates. Such trials should be relevant to the specific clinical situation and not generalize results from animal studies or nongynecologic human studies, such as orthopedics or dental surgery. Surgeons play an important role in requiring appropriate clinical trials before bringing new surgical materials into the operating room. Finally, it is important that patients be informed about materials that are to be used in their reconstruction.

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