Surgical management of vaginal vault prolapse
Choosing the right procedure is a judgment call, based on the patient’s age, desire for coitus, and overall health.
IN THIS ARTICLE
First, the good news: We have numerous techniques to choose from to repair prolapse of the vaginal vault, which affects as many as 50% of parous women.1 The bad news: Most of the data on these techniques are anecdotal or retrospective, not the result of randomized, controlled trials. Few investigators have compared the vaginal and abdominal approaches.
So how should we decide on a procedure? It is a judgment call, ultimately. After taking into account the patient’s age, functional status, comorbidities, desire for coitus, and surgical history, the surgeon must weigh the risks and benefits of the procedures that seem most appropriate. Part 1 of this 2-part article reviews what is known about the most widely used and newest vaginal techniques:
- sacrospinous ligament fixation,
- iliococcygeal fixation,
- modified McCall culdoplasty,
- high uterosacral ligament suspension with fascial reconstruction, and
- posterior intravaginal slingplasty (infracoccygeal sacropexy).
In Part 2, next month, we focus on the abdominal approach, and survey the data comparing vaginal and abdominal repairs.
Unfortunately, success and failure rates are still poorly defined because of a lack of standardization, and because techniques and materials continually change. This underscores the need for better understanding of the pathophysiology of genital prolapse, improved preoperative assessment, and more effective and durable repair techniques.
Why prolapse occurs
Pelvic support involves a complex interplay of anatomic, histologic, genetic, and electrophysiologic factors that, although incompletely understood, are frequently disrupted. For example, MacLennan et al2 reported that 46.2% of women aged 15 to 97 years experience pelvic floor dysfunction; a large retrospective study by Olsen and colleagues3 found that 11.1% of women undergo surgery for prolapse by the age of 80, and 29.2% of these women require repeat surgery.
Here’s what we know about the anatomy of pelvic support:
Ligaments serve as secondary supports
The uterus and upper third of the vagina are held in place over the levator plate by the fibers of the parametrium (cardinal and uterosacral ligaments) and paracolpium. These fibers arise from a broad area on the pelvic sidewall overlying the fascia of the piriformis muscle, the sacroiliac joint, and lateral sacrum. The fibers represent condensations of the endopelvic fascia of the pelvis, acting as suspensory ligaments that run in a predominantly vertical direction to insert into the lateral upper third of the vagina and lateral and posterolateral aspect of the cervical portion of the uterus.
In the normal, healthy pelvis, these suspensory ligaments represent secondary support mechanisms and are not routinely under tension.
Pelvic-floor muscles play leading role
Gosling4 argued that pelvic floor muscle tone is more crucial to normal positioning of the pelvic viscera than are the fascial and ligamentous supports of the pelvic organs. Specifically, the pubococcygeus, iliococcygeus, and puborectalis muscles collectively define the levator ani of the pelvic floor. Fusion of the right and left bellies of the levator ani, behind the rectum and anterior to the coccyx, creates a muscular platform known as the levator plate. This plate provides indirect support for the upper genital tract by acting as a platform against which the upper vagina and other pelvic viscera are compressed during increases in intra-abdominal pressure.
Contraction of the levator ani pulls the levator plate toward the posterior symphysis pubis, minimizing the size of the urogenital hiatus through which the rectum, vagina, and urethra exit the pelvis on their way to the perineum. Weakness in the muscular pelvic floor—whether caused by disuse, pudendal nerve damage, or muscular trauma—increases the size of the urogenital hiatus, and the pelvic organs begin to prolapse through it.
Ultimately, constant tension on the ligamentous supports of the pelvic organs exceeds their tensile strength, and pelvic organ prolapse results.
Goals of surgery
Successful surgery achieves effective and sustained vault support, obliterates any enterocele sac, and repairs the cystocele and rectocele that occur in approximately two thirds of women with vault prolapse.
The broader goals: anatomic and functional restoration of the lower female genital tract and improvement in quality of life.
Surgery can be reconstructive or obliterative. Reconstructive surgery can be performed vaginally, abdominally, or a combination of both.
Proponents of the vaginal approach argue that, by avoiding the need for laparotomy, it results in fewer complications, less blood loss and postoperative discomfort, a shorter hospital stay, and less expense.5
Sacrospinous ligament fixation
The sacrospinous ligaments extend from the ischial spines on either side to the lower portion of the sacrum and coccyx. Fixation of the vaginal apex to 1 or both of the sacrospinous ligaments is an option for posthysterectomy vault prolapse.
Technique. Nichols6 described the need to penetrate the right rectal pillar into the pararectal space near the ischial spine. The next step is grasping the ligament and muscle with a long Babcock clamp. Place two #2 polyglycolic sutures through the sacrospinous ligament, 1.5 to 2 fingerbreadths medial to the ischial spine. Attach 1 end of the suture to the undersurface of the posterior vaginal wall at the apical area. When the posterior colporrhaphy reaches the midportion of the vagina, tie the sacrospinous suspension sutures, firmly attaching the vaginal apex to the surface of the coccygeal-sacrospinous ligament complex with no intervening suture bridge (FIGURE 1).
Modifications. The most notable modification is the Miyazaki technique, which substitutes the Miya hook for the DesChamps ligature carrier. The Miya hook is reportedly safer for the pudendal complex, which may lie up to 5.5 cm medial to the ischial spine.7 The path of the Miya hook avoids Alcock’s canal and its neurovascular pudendal bundle.
The Caprio ligature carrier (Boston Scientific, Boston, Mass) is also useful for the placement of sacrospinous sutures; unlike the Miya hook, however, the Caprio ligature carrier is a disposable instrument and thus is not reusable.
Potential complications of sacrospinous ligament fixation include hemorrhage, pudendal nerve injury, rectal or bladder injury, and recurrent anterior vaginal wall prolapse.
Outcomes. Follow-up studies in women undergoing this procedure report a roughly 20% incidence of recurrent or persistent anterior vaginal wall relaxation, or symptomatic cystocele, within 1 year after the surgery. Alteration of the vaginal axis in an exaggerated posterolateral direction after this procedure is thought to place undue tension on the anterior segment of the vaginal wall and predispose women to prolapse at a site opposite the repair.8,9
FIGURE 1 2 “pulley stitches” secure the apex
Place 2 nonabsorbable monofilament “pulley stitches” to secure the vaginal apex to the ligament.
Inmon10 was the first to describe a technique in which the everted vaginal apex is secured to the iliococcygeal fascia bilaterally, just below the ischial spine. He performed this technique successfully in 3 women with atrophied uterosacral ligaments.
Technique. Open the posterior vaginal wall in the midline, as if preparing to perform a posterior colporrhaphy. Develop the rectovaginal spaces bluntly and bilaterally—laterally toward the levator muscles and posteriorally toward the ischial spines. Use the nondominant hand to depress the rectum downward and medially, and place a single #0 polyglycolic suture deep into the iliococcygeus muscle and fascia at a point 1 to 2 cm caudad and posterior to the ischial spine. Then pass both ends of the suture through the ipsilateral posterior vaginal apex and hold them with a hemostat. Repeat the procedure contralaterally.
Usually no vaginal epithelium needs excision because the upper vagina is attached bilaterally, resulting in good vaginal length and circumference. When posterior colporrhaphy is completed and the posterior vaginal wall is closed, tie both iliococcygeal-fixation sutures in place.
Complications. Shull and colleagues11 studied 42 women who underwent suspension of the vaginal cuff to iliococcygeus fascia and repair of coexisting pelvic support defects. Of these women, 2 (5%) had recurrence of their cuff prolapse during follow-up, one of whom required further surgery (she also had recurrence of an inguinal hernia that had been repaired at the original surgery). The other patient, who had undergone 5 previous pelvic procedures, developed asymptomatic prolapse of the cuff halfway to the hymen. Six additional patients had loss of support at other sites in the follow-up period, one of whom required repeat surgery. Ninety-five percent of women experienced no persistence or recurrence of cuff prolapse 6 weeks to 5 years after the procedure.
Meeks and colleagues12 also applied the Inmon technique in 110 women with posthysterectomy vault prolapse or total uterine procidentia. In both studies, the most commonly reported complications included hemorrhage (1.2%), bladder/rectal perforation (1.2%), and recurrent vault prolapse (8%).
Benefits. In comparison with sacrospinous ligament fixation, iliococcygeus fixation is technically easier and places less tension on the anterior vaginal wall.
Modified McCall culdoplasty
Symmonds and colleagues13 described this approach to symptomatic vaginal vault prolapse.
Technique. Excise an elliptical wedge of mucosa from the anterior and posterior walls of the prolapsed vagina to narrow the vault and allow access to the lateral fascial supports of the vagina and rectum. The width and length of the excised wedges are determined by the desired dimensions of the reconstructed vagina.
After isolating and excising the enterocele sac, place up to 3 modified McCall stitches, each one slightly higher than its predecessor. Each suture should incorporate the full thickness of the posterior vaginal wall, the cul-de-sac peritoneum, the remains of the uterosacral-cardinal complex bilaterally, and the fascial tissue lateral and posterior to the upper vagina and rectum (FIGURE 2).
Once they are in place, tie the sutures in the opposite order in which they were placed. These stitches fix the prolapsed vaginal vault to the uppermost portion of the endopelvic fascia at the same time as they accomplish a high closure of the culdesac peritoneum.
The evidence. Sze and Karram5 found an 11.5% incidence of recurrent vault prolapse and an associated 22% incidence of new-onset dyspareunia.
FIGURE 2 Classic vs modified McCall culdoplasty
In the classic McCall culdoplasty shown here, only the distal-most suture incorporates the posterior vaginal wall. With the “modified” technique, however, all sutures incorporate the full thickness of the posterior vaginal wall, as well as the cul-de-sac peritoneum, the remnants of the uterosacral-cardinal complex bilaterally, and the fascial tissue lateral and posterior to the upper vagina and rectum.
High uterosacral ligament suspension with fascial reconstruction
This approach is based on the observations of Richardson,14 who suggested that the endopelvic fascial supports (uterosacral/cardinal complex) do not stretch and attenuate over time, as some have hypothesized, but break at definable points. By identifying these points, the surgeon can reattach the prolapsed vagina to the intact uterosacral complex cephalad to the break.
Technique. Grasp the vaginal apex with 2 Allis clamps and incise it with a scalpel. If an enterocele sac is present, dissect it off the vaginal epithelium to the neck of the hernia, open it, and then excise it. Place a delayed absorbable or permanent pursestring suture about the neck of the hernia to close the peritoneal defect. If an anterior colporrhaphy or sling is required, perform them at this time.
Place a moist laparotomy pad in the cul-de-sac, and insert and elevate a Deaver retractor to remove the intestines from the cul-de-sac and improve exposure. Next, palpate the ischial spines transperitoneally.