Prospective, randomized, controlled trial of Starion vs Ligasure hemorrhoidectomy for prolapsed hemorrhoids

Comparing outcomes of laser hemorrhoidoplasty and LigaSure hemorrhoidectomy in grade II-III hemorrhoidal disease: a retrospective analysis

BACKGROUND

Hemorrhoidal disease is a common ailment that presents a challenge in terms of standard treatment methods. Although surgical hemorrhoidectomy is often considered the gold standard, new surgical techniques have emerged, such as laser hemorrhoidoplasty and LigaSure hemorrhoidectomy, to address postoperative pain, bleeding, and extended return-to-work times. This study aims to compare the outcomes of laser hemorrhoidoplasty and LigaSure hemorrhoidectomy in patients with grade II-III hemorrhoidal disease.

METHODS

A retrospective analysis was conducted on a cohort of patients who underwent laser hemorrhoidoplasty or LigaSure hemorrhoidectomy. Data were collected on postoperative pain, complications, recurrence rates, and return-to-work times. The primary outcome was the difference in postoperative pain between the two groups, as assessed using the Visual Analog Scale (VAS).

RESULTS

Patients in the laser hemorrhoidoplasty group experienced significantly lower postoperative pain compared to those in the LigaSure hemorrhoidectomy group. Bleeding amounts during the operation were also significantly lower in the laser group. However, the recurrence rate was higher in the laser group compared to the LigaSure group (9.4% versus 2.5%). Return to work and normal activities time after laser hemorrhoidoplasty was shorter than after LigaSure hemorrhoidectomy.

CONCLUSION

Laser hemorrhoidoplasty is a minimally invasive technique that can be safely applied in suitable grade II-III patients, offering lower postoperative pain rates, fewer complications, and shorter return to work and normal activity times compared to LigaSure hemorrhoidectomy. However, recurrence rates are still higher for laser hemorrhoidoplasty. Future studies should explore the potential of combining laser hemorrhoidoplasty with other surgical treatments.

Modified ultrasound scalpel haemorrhoidectomy versus conventional haemorrhoidectomy for mixed haemorrhoids: a study protocol for a single-blind randomised controlled trial

BACKGROUND

Haemorrhoids are common and frequently occurring diseases in the clinical setting, and severe haemorrhoids require surgical treatment. There are various surgical methods to treat haemorrhoids, but each has advantages and disadvantages. In recent years, ultrasonic scalpels have been used in haemorrhoid surgery and have achieved good results. Ultrasonic scalpel haemorrhoidectomy is safer and more effective in the surgical treatment of grade III and IV haemorrhoids, with less intraoperative bleeding, less postoperative pain, and fewer complications than diathermic therapy, electrosurgical haemorrhoidectomy, PROXIMATE® PPH haemorrhoidal circular stapler haemorrhoidopexy (PPH), and traditional haemorrhoidectomy. In previous reports, the majority of ultrasonic scalpel haemorrhoidectomies were performed as open procedures, with only the body of the haemorrhoid removed with the ultrasonic scalpel and the wound left open for drainage and natural healing. However, we performed a preliminary experiment with 12 patients who underwent open ultrasonic scalpel haemorrhoidectomy in the early stage. The results showed that 8 patients had different degrees of postoperative bleeding, and 4 of them required a second haemostatic surgery under anaesthesia. Therefore, we modified the open ultrasonic scalpel haemorrhoidectomy procedure by removing the mucosa of the internal haemorrhoid and closing the base of the incision with figure-eight penetrating sutures and designed this study protocol to evaluate its clinical efficacy and safety.

METHODS

A randomised single-blind parallel-controlled trial is proposed for this project, and patients who meet the inclusion criteria will be divided into a test group and a control group, with 39 patients in each group. The experimental group will be treated with modified ultrasonic scalpel haemorrhoidectomy, and the control group will be treated with the Milligan-Morgan operation. The effectiveness of modified ultrasonic scalpel haemorrhoidectomy for haemorrhoids will be objectively evaluated, including the incision healing time and the time for patients to return to normal activities, postoperative complications, evaluations of anal function 3 months and 6 months after surgery, an evaluation of quality of life 6 months after surgery, and an evaluation of the patient satisfaction rate 6 months after surgery. The safety assessment will consider all adverse and serious adverse events associated with the study treatment.

DISCUSSION

The study was approved by the ethics committee. The first patient was registered on July 1 2021. The purpose of this trial will be to evaluate the clinical efficacy and safety of the modified ultrasonic scalpel haemorrhoidectomy procedure for the treatment of mixed haemorrhoids and to provide an evidence base for the clinical promotion and application of the procedure. A limitation of this study is that only the patients will be single-blinded because the researchers and the patients cannot be blinded at the same time, which may produce certain bias in the results. In addition, the sample size of this study will be small, and the test results will only represent the findings from this clinical trial. In later stages, the sample size needs to be further expanded to improve the level of evidence. Despite its limitations, we hope the present study will help provide a more optimised surgical approach in the selection of haemorrhoid surgery.

TRIAL REGISTRATION

Chinese Clinical Trial Registry (Registration ID: ChiCTR2100047229). Registered on June 11, 2021.

Belgian consensus guideline on the management of hemorrhoidal disease

Introduction

Hemorrhoidal disease is a common problem that arises when hemorrhoidal structures become engorged and/or prolapse through the anal canal. Both conservative and invasive treatment options are diverse and guidance to their implementation is lacking.

Methods

A Delphi consensus process was used to review current literature and draft relevant statements. These were reconciliated until sufficient agreement was reached. The grade of evidence was determined. These guidelines were based on the published literature up to June 2020.

Results

Hemorrhoids are normal structures within the anorectal region. When they become engorged or slide down the anal canal, symptoms can arise. Every treatment for symptomatic hemorrhoids should be tailored to patient profile and expectations. For low-grade hemorrhoids, conservative treatment should consist of fiber supplements and can include a short course of venotropics. Instrumental treatment can be added case by case : infrared coagulation or rubber band ligation when prolapse is more prominent. For prolapsing hemorrhoids, surgery can be indicated for refractory cases. Conventional hemorrhoidectomy is the most efficacious intervention for all grades of hemorrhoids and is the only choice for non-reducible prolapsing hemorrhoids.

Conclusions

The current guidelines for the management of hemorrhoidal disease include recommendations for the clinical evaluation of hemorrhoidal disorders, and their conservative, instrumental and surgical management.

Comparison of surgical procedures implemented in recent years for patients with grade III and IV hemorrhoids: a network meta-analysis

PURPOSE

This study aimed to investigate the complications and recurrence rates of the different surgical procedures implemented in recent years for the treatment of grade III and IV hemorrhoids using a network meta-analysis approach.

METHODS

A systematic literature search was conducted for randomized clinical trials (RCTs) published from January 2013 to August 2018, via PubMed, Embase, the Cochrane Library, and Web of Science. Data related to anal stenosis, fecal incontinence, hemorrhoids thrombosis, and recurrence rates were extracted from the included studies, which were selected based on associations with surgical procedures for grade III and IV hemorrhoids. A network meta-analysis was conducted by using the automated software Aggregate Data Drug Information System (ADDIS) 1.16.8 to evaluate and rank the safety and efficacy of the different surgical methods.

RESULTS

Twenty-one studies with 2799 participants involving nine surgical procedures for grade III and IV hemorrhoids were ultimately analyzed. Transanal hemorrhoidal dearterialization (THD) and stapled hemorrhoidectomy (SH) exhibited fewer anal stenosis than open hemorrhoidectomy (OH) and Harmonic scalpel (Harmonic). SH presented the highest fecal incontinence rates. OH and Harmonic presented lower hemorrhoids thrombosis than SH and THD. Importantly, SH and THD exhibited the highest recurrence rates, when compared with the other hemorrhoidectomy surgical procedures.

CONCLUSIONS

In summary, THD and SH were found to be associated with more complications and higher recurrence rates. In addition, the use of OH treatments resulted in less hemorrhoids thrombosis rate but higher recurrence rate. The use of Harmonic resulted in higher anal stenosis rate but lower recurrence rate.

A Randomized Controlled Trial Comparing Suture-Fixation Mucopexy and Doppler-Guided Hemorrhoidal Artery Ligation in Patients with Grade III Hemorrhoids

Background. We aimed to evaluate the effectiveness of a suture-fixation mucopexy procedure by comparing with Doppler-guided hemorrhoidal artery ligation (DGHAL) in the management of patients with grade III hemorrhoids. Methods. This was a randomized controlled trial. One hundred patients with grade III hemorrhoids were randomly assigned to receive suture-fixation mucopexy (n = 50) or DGHAL (n = 50). Outcome assessments were performed at 2 weeks, 12 months, and 24 months. Assessments included resolution of clinical symptoms, postoperative complications, duration of hospitalization, and total costs. Results. At 2 weeks, one (2%) patient in suture-fixation group and four (8%) patients in DGHAL group had persistent prolapsing hemorrhoids. Postoperative bleeding was observed in two patients (4%) in suture-fixation group and one patient in DGHAL group. There was no significant difference in short-term recurrence between groups. Postoperative complications and duration of hospitalization were comparable between the two groups. Rates of recurrence of prolapse or bleeding at 12 months did not differ between groups. However, recurrence of prolapse at 24 months was significantly more common in DGHAL group (19.0% versus 2.3%, p = 0.030). Conclusions. Compared with DGHAL, the suture-fixation mucopexy technique had comparable short-term outcomes and favorable long-term outcomes.

Systematic review and network meta-analysis comparing clinical outcomes and effectiveness of surgical treatments for haemorrhoids

BACKGROUND

The aim was to compare the clinical outcomes and effectiveness of surgical treatments for haemorrhoids.

METHODS

Randomized clinical trials were identified by means of a systematic review. A Bayesian network meta-analysis was performed using the Markov chain Monte Carlo method in WinBUGS.

RESULTS

Ninety-eight trials were included with 7827 participants and 11 surgical treatments for grade III and IV haemorrhoids. Open, closed and radiofrequency haemorrhoidectomies resulted in significantly more postoperative complications than transanal haemorrhoidal dearterialization (THD), LigaSure™ and Harmonic® haemorrhoidectomies. THD had significantly less postoperative bleeding than open and stapled procedures, and resulted in significantly fewer emergency reoperations than open, closed, stapled and LigaSure™ haemorrhoidectomies. Open and closed haemorrhoidectomies resulted in more pain on postoperative day 1 than stapled, THD, LigaSure™ and Harmonic® procedures. After stapled, LigaSure™ and Harmonic® haemorrhoidectomies patients resumed normal daily activities earlier than after open and closed procedures. THD provided the earliest time to first bowel movement. The stapled and THD groups had significantly higher haemorrhoid recurrence rates than the open, closed and LigaSure™ groups. Recurrence of haemorrhoidal symptoms was more common after stapled haemorrhoidectomy than after open and LigaSure™ operations. No significant difference was identified between treatments for anal stenosis, incontinence and perianal skin tags.

CONCLUSION

Open and closed haemorrhoidectomies resulted in more postoperative complications and slower recovery, but fewer haemorrhoid recurrences. THD and stapled haemorrhoidectomies were associated with decreased postoperative pain and faster recovery, but higher recurrence rates. The advantages and disadvantages of each surgical treatment should be discussed with the patient before surgery to allow an informed decision to be made.

Surgical management of hemorrhoids

Hemorrhoids are common human afflictions known since the dawn of history. Surgical management of this condition has made tremendous progress from complex ligation and excision procedures in the past to simpler techniques that allow the patient to return to normal life within a short period. Newer techniques try to improve on the post-operative complications of older ones. The surgical options for the management of hemorrhoids today are many. Capturing all in a single article may be difficult if not impossible. The aim of this study therefore is to present in a concise form some of the common surgical options in current literature, highlighting some important post operative complications. Current literature is searched using MEDLINE, EMBASE and the Cochrane library. The conclusion is that even though there are many surgical options in the management of hemorrhoids today, most employ the ligature and excision technique with newer ones having reduced post operative pain and bleeding.

Comparison of Ligasure Hemorrhoidectomy with Conventional Ferguson's Hemorrhoidectomy

Conventional hemorrhoidectomy for grade III and IV hemorrhoids is a tedious procedure associated with significant morbidity and a prolonged convalescence. We compared Ligasure™ hemorrhoidectomy with conventional 'closed' Ferguson's hemorrhoidectomy for the treatment of grade III and IV hemorrhoids. Forty-eight consecutive patients of grade III and IV hemorrhoids were randomized to either the Ligasure™ hemorrhoidectomy (28 patients) or Ferguson's hemorrhoidectomy (20 patients). The hemorrhoidal predicle was coagulated with Ligasure™ in the Ligasure™ group and transfied with 2/0 chromic catgut in Ferguson's method. In comparison with Ferguson's method, Ligasure™ hemorrhoidectomy had a shorter operating time (29 vs 12.5 min), less blood loss (22 vs 11.5 ml), less post operative pain as measured on VAS scale and less postoperative complications including hemorrhage (10% vs 3.5%), urinary retention (10% vs 3.5%) and wound breakdown (20% vs 14%). The submucosal dissection technique with Ligasure™ coagulation of the hemorrhoidal pedicle is safe and effective. The blood vessels and tissue are reduced to a wafer thin seal with good hemostasis. Suturing is not required as the mucosal tissue over the pedicle is sealed off with the current. There is minimal lateral spread of either thermal or electrical energy. The external components of the hemorrhoids can also be treated at the same time. Because of its ease of use and less postoperative pain and complication Ligasure™ hemorrhoidectomy can be preformed as a day-care procedure.

LigaSure hemorrhoidectomy versus stapled hemorrhoidopexy: a prospective, randomized clinical trial

PURPOSE

This study was designed to compare the outcome of LigaSure hemorrhoidectomy and stapled hemorrhoidopexy for prolapsed hemorrhoids.

METHODS

Consecutive patients with grade III or IV hemorrhoids were randomly assigned to undergo either LigaSure hemorrhoidectomy or stapled hemorrhoidopexy. Data on patient demographic and clinical characteristics, operative details, postoperative pain score on a visual analog scale, number of parenteral analgesic injections, duration of hospital stay, and time to return to work were all prospectively collected. Postoperative complications and recurrence of prolapse were also recorded. Patients were regularly followed for a total period of 12 months.

RESULTS

A total of 68 patients completed the study (34 per group). Patient demographic and clinical characteristics were similar in the 2 groups. No significant differences between LigaSure hemorrhoidectomy and stapled hemorrhoidopexy were observed in mean operating time, postoperative pain score, number of parenteral analgesic injections, duration of hospital stay, or time to return to work. The groups were also similar regarding postoperative complications, except that at 4 weeks postoperatively, residual prolapse was observed in 8 patients (23.5%) in the stapled hemorrhoidopexy group vs. 2 patients (5.9%) in the LigaSure group (P = .040). Rate of recurrence of prolapse at 1 year was higher with stapled hemorrhoidopexy (4 patients, 11.8%) than with the LigaSure procedure (1 patient, 2.9%), but the difference was not significant (P = .163).

CONCLUSIONS

LigaSure hemorrhoidectomy and stapled hemorrhoidopexy yield comparable good results, with a short operative time and minimal side effects in the treatment of grade III and IV hemorrhoids, but with a lower rate of residual prolapse for the LigaSure procedure. Both procedures offer low levels of postoperative pain and therefore are excellent therapeutic options for prolapsed grade III and IV hemorrhoids. A larger controlled study is needed to reach solid conclusions regarding risk of postoperative recurrence of hemorrhoidal prolapse.

Total Thyroidectomy Performed With the Starion Vessel Sealing System Versus the Conventional Technique: A Prospective Randomized Trial

Meticulous dissection and accurate hemostasis are required in thyroid surgery. The authors recently performed a number of thyroidectomies using a new device that combines heat and pressure for sealing and cutting tissue. A prospective randomized trial was conducted on 98 patients subjected to total thyroidectomy for benign disease: 49 patients (group A) with the Starion tissue welding system and 49 (group B) with the clamp-and-tie technique. The 2 groups were comparable in mean age, gender, thyroidal volume (20-60 mL), incision length (<35 mm), and pathology. The authors evaluated operative time, postoperative serum calcemia, dosage and length of postoperative calcium and vitamin D treatment, drainage volume, hospital stay, and complications. Student’s t test was used for quantitative variables; for categorical variables, the χ 2 test or Fisher’s exact test, as appropriate, was used. The mean operative time was 53.8 ± 6.1 minutes in group A and 63.2 ± 8 minutes in group B ( P < .0001). The difference in terms of postoperative calcemia was significant (group A: 8.35 ± 0.39 mg/dL; group B: 8.08 ± 0.39 mg/dL; P < .001). The duration of postoperative treatment with calcium and vitamin D was significantly different (group A: 4 days; group B: 5 days; P < .039). No significant difference in terms of postoperative complications was found. The new system reduced operative time and the duration of postoperative hypocalcemia, and there was minimal tissue necrosis and thermal spread. The reduction in duration of postoperative calcium and vitamin D treatment is also an indication of improvement in quality of the treatment.

Haemorrhoidectomy by vessel sealing system under local anaesthesia in an outpatient setting: preliminary experience

AIM

This prospective study was designed to assess the feasibility of local anaesthesia for LigaSure haemorrhoidectomy in an outpatient setting.

METHOD

From April 2006 to March 2007, 207 consecutive patients (median age 42, 126 males) with grade III (147) and grade IV (60) haemorrhoids, underwent Milligan-Morgan haemorrhoidectomy with LigaSure under local anaesthesia (lidocaine 1%, mean dose 27 +/- 1.7 ml) in an outpatient setting. Postoperative pain was assessed by a visual analogue scale (VAS).

RESULTS

Two, three and four files were removed in 120, 51 and 36 patients. Mean operative time was 12 +/- 5.2 min and mean blood loss was 3.4 +/- 3.9 ml. The mean postoperative pain scores were 6.2 +/- 2.1 for the maximal pain intensity and 6.1 +/- 2.5 for the pain on defecation. All patients left hospital after surgery within 2 h and 33 (15.9%) required analgesics. They returned to normal daily activity after 12.2 +/- 7.9 days including work (12.1 +/- 7.8 days). The wounds had healed by 32.2 +/- 9.1 days. At a follow-up of at least 6 months, only six cases of major bleeding had occurred and 24 patients had skin tags. The median satisfaction score was +2 (-2 to +3).

CONCLUSION

LigaSure haemorrhoidectomy under local anaesthesia in the outpatient setting is safe and effective.

Conventional versus LigaSure hemorrhoidectomy for patients with symptomatic Hemorrhoids

BACKGROUND

Hemorrhoidectomy is a frequently performed surgical procedure and associated with postprocedural pain. The use of the Ligasure could result in a decreased incidence of pain as coagulation with high frequency currency and active feedback control over the power output has minimal thermal spread and limited tissue charring.

OBJECTIVES

To compare patient tolerance focussing on pain following Ligasure and conventional hemorrhoidectomy in patients with symptomatic hemorrhoids.

SEARCH STRATEGY

A multi-database (MEDLINE, EMBASE, CENTRAL and CINAHL) systematic search was conducted. Key journals were handsearched. There was no restriction on language.

SELECTION CRITERIA

Randomized controlled trials comparing hemorroidectomy using the Ligasure-technique with conventional diathermy techniques for symptomatic hemorrhoids in adult patients were included.

DATA COLLECTION AND ANALYSIS

Two reviewers independently extracted data, assessed trial quality and resolved discrepancies together with a third party. Odd Ratios were generated for dichotomous variables. Weight Mean Differences were used for analysing continuous variables. Only random effects models were used. Heterogeneity was explored by sensitvity analysis.

MAIN RESULTS

Twelve studies with 1142 patients met the inclusion criteria. The pain score at the first day following surgery was significantly less in the Ligasure group (10 studies, 835 patients, WMD -2.07 CI -2.77 to -1.38). Most outcomes concerning analgesics used (7 studies) and pain scores up to 7 days (5 studies) favoured the Ligasure-technique. The benefit was diminished at day 14 (VAS pain score, 4 studies, 183 patients, WMD -0.12 CI -0.37 to 0.12). The conventional technique took significantly longer to complete (11 trials, 9.15 minutes, CI 3.21 to 15.09). There was no relevant difference in postoperative complications, symptoms of recurrent bleeding or incontinence at final follow-up. Hospital stay was similar for both groups (6 reports, 525 patients, WMD -0.19 CI -0.63 to 0.24). Patients treated with the Ligasure-technique returned to work significantly earlier (4 studies, 451 patients, 4.88 days, CI 2.18 to 7.59). Sensitivity analysis on high quality studies, fixed effects models, open or closed conventional techniques revealed no clinical relevant different results.

AUTHORS' CONCLUSIONS

Since the usage of the Ligasure technique results in significantly less immediate postoperative pain after hemoroidectomy without any adverse effect on postoperative complications, convalescence and incontinence-rate, this technique is superior in terms of patient tolerance. Although there was a tendency for equal efficacy, more evaluation of the long-term risk of recurrent hemorrhoidal disease is required.

Conventional versus LigaSure hemorrhoidectomy for patients with symptomatic Hemorrhoids

BACKGROUND

Hemorrhoidectomy is a frequently performed surgical procedure and associated with postprocedural pain. The use of the Ligasure could result in a decreased incidence of pain as coagulation with high frequency currency and active feedback control over the power output has minimal thermal spread and limited tissue charring.

OBJECTIVES

To compare patient tolerance focussing on pain following Ligasure and conventional hemorrhoidectomy in patients with symptomatic hemorrhoids.

SEARCH STRATEGY

A multi-database (MEDLINE, EMBASE, CENTRAL and CINAHL) systematic search was conducted. Key journals were handsearched. There was no restriction on language.

SELECTION CRITERIA

Randomized controlled trials comparing hemorroidectomy using the Ligasure-technique with conventional diathermy techniques for symptomatic hemorrhoids in adult patients were included.

DATA COLLECTION AND ANALYSIS

Two reviewers independently extracted data, assessed trial quality and resolved discrepancies together with a third party. Odd Ratios were generated for dichotomous variables. Weight Mean Differences were used for analysing continuous variables. Only random effects models were used. Heterogeneity was explored by sensitvity analysis.

MAIN RESULTS

Twelve studies with 1142 patients met the inclusion criteria. The pain score at the first day following surgery was significantly less in the Ligasure group (10 studies, 835 patients, WMD -2.07 CI -2.77 to -1.38). Most outcomes concerning analgesics used (7 studies) and pain scores up to 7 days (5 studies) favoured the Ligasure-technique. The benefit was diminished at day 14 (VAS pain score, 4 studies, 183 patients, WMD -0.12 CI -0.37 to 0.12). The conventional technique took significantly longer to complete (11 trials, 9.15 minutes, CI 3.21 to 15.09). There was no relevant difference in postoperative complications, symptoms of recurrent bleeding or incontinence at final follow-up. Hospital stay was similar for both groups (6 reports, 525 patients, WMD -0.19 CI -0.63 to 0.24). Patients treated with the Ligasure-technique returned to work significantly earlier (4 studies, 451 patients, 4.88 days, CI 2.18 to 7.59). Sensitivity analysis on high quality studies, fixed effects models, open or closed conventional techniques revealed no clinical relevant different results.

AUTHORS' CONCLUSIONS

Since the usage of the Ligasure technique results in significantly less immediate postoperative pain after hemoroidectomy without any adverse effect on postoperative complications, convalescence and incontinence-rate, this technique is superior in terms of patient tolerance. Although there was a tendency for equal efficacy, more evaluation of the long-term risk of recurrent hemorrhoidal disease is required.

Evidence based treatment of hemorrhoids

A number of different hemorrhoids' treatment modalities were introduced and discussed during last two decades. Different level of evidence supports one or another approach and new data emerge constantly. Decision to apply particular method of treatment force clinicians to make thorough judgment. The article presents the newest data about different aspects of hemorrhoids management focusing on proof of efficacy.

Operative Time and Other Outcomes of the Electrothermal Bipolar Vessel Sealing System (LigaSure™) Versus Other Methods for Surgical Hemostasis: A Meta-Analysis

A meta-analysis was performed of 29 prospective, randomized trials (published January 1, 2000, to August 14, 2007) comparing an electrothermal bipolar vessel sealing system (EBVS-LigaSure™, Covidien) (total n = 1107 patients) with either clamping with suture ligation/ electrocauterization (n = 1079 patients) or ultrasonic energy (eg, Harmonic Scalpel®, Johnson & Johnson). Hemorrhoidectomy (12 articles), hysterectomy (4 articles), and thyroidectomy (3 articles) were the most common procedures. For 15 of 26 studies reporting standard deviations, the normalized mean operative time reduction for EBVS equaled 28% (95% confidence interval [CI] 18%-39%, P < .0001) compared with conventional surgical hemostasis. Operative time was reduced with EBVS in 24 of 26 studies ( P < .0001). EBVS was associated with 43 mL (95% CI 14-73 mL, P = .0021) less blood loss, fewer complications (odds ratio 0.66, 95% CI 0.47-0.92, P = .02), and mean reduction in postoperative pain of 2.8 units (95% CI 1.5-4.1, P < .0001). Five studies used ultrasonic energy as the comparator, but none reported standard deviation so data could not be pooled.