Variables associated with 30-day postoperative complications in lower extremity free flap reconstruction identified in the ACS-NSQIP database

Predictors and Outcomes of Repeated Unplanned Reoperations After Free Tissue Transfer

INTRODUCTION

Free tissue transfers are often completed in patients with high comorbidities, which carry significant risk for postoperative complications, including one or more reoperations. The objective of this study is to understand the prevalence and timing of these reoperations, as well as quantify demographic and clinical predictors of such outcomes.

METHODS

The 2013-2022 National Surgical Quality Improvement Program database was queried for free tissue transfer operations. Records were characterized with demographic, comorbidity, preoperative, and intraoperative variables. The main outcome of interest was the occurrence of one or more unplanned reoperations. Furthermore, multivariate logistic regression was performed to identify predictors for first and second reoperation (P < 0.05).

RESULTS

The final patient cohort comprised 29,733 free tissue transfer patients. A total of 3671 (12.3%) patients had one unplanned reoperation, 780 (2.6%) had two unplanned reoperations, and 180 (0.6%) had more than two unplanned reoperations. Patients who experienced two reoperations had a significantly earlier occurrence of initial reoperation (4.7 ± 6.0 days) when compared to those who only experienced one reoperation (8.5 ± 9.0 days) (P < 0.001). Common predictors of both first and second reoperation were smoking history and longer operative time (P < 0.05). Notably, an initial reoperation for vascular repair (OR, 2.29; 95% CI, 1.80-2.92; P < 0.001) or additional tissue transfer (OR, 2.10; 95% CI, 1.46-3.02; P < 0.001) also conferred a higher risk for subsequent reoperation.

CONCLUSIONS

Prevalence of reoperations in free tissue transfer is significant. In addition to well-characterized factors like comorbidities and perioperative status, specific regions of reconstruction, and indications for initial reoperation may indicate a higher risk for subsequent reoperation, informing general postoperative risk assessment.

Effects of Preoperative Hemoglobin on Microsurgical Reconstruction and Perioperative Blood Transfusion Requirement: A Meta-Analysis and Systematic Review of the Literature

PURPOSE

Although blood loss in microsurgical reconstruction is rarely large enough to be life-threatening, preoperative anemia can be a particular issue in terms of postoperative morbidity, impaired wound healing, and compromised tissue viability. We seek to review the effect of preoperative hemoglobin (Hgb) levels on perioperative blood transfusion (PBT) requirements and complications to guide management of patients with preexisting anemia undergoing reconstruction.

METHODS

PubMed, Embase, and Scopus were queried for relevant articles. Inclusion criteria were as follows: original studies investigating outcomes and PBT requirements in flap-based reconstruction based on preoperative Hgb levels. Patient and study characteristics were analyzed using descriptive statistics. A meta-analysis was conducted to assess transfusion requirements across the included studies using Stata (version 18.0 Stata Corp, College Station, Texas, USA). The Fisher method was used to aggregate individual study p values into a single combined value to statistically assess the combined findings, where a p value of < 0.05 was set as statistically significant.

RESULTS

One thousand three hundred and eighty-nine studies were screened for title and abstract relevance, 14 of which met the inclusion criteria, including a total of 61,116 patients. Meta-analysis of the studies revealed a PBT requirement of 36.2% for anemic individuals, significantly higher than the 20.0% for those with normal preoperative Hgb levels (p < 0.001), with an average 4.9 versus 2.4 units of packed red blood cells being transfused (p < 0.001). The majority of studies concluded that preoperative anemia was associated with medical complications, such as myocardial infarction, stroke, and infection (p < 0.001). While six studies reported a significant relationship between low preoperative Hgb and flap morbidity (flap loss and partial flap necrosis), two studies found no correlation. The overall postoperative complication rate across the studies was 42.2% among patients with low preoperative Hgb levels, whereas the nonanemic group demonstrated a markedly lower rate of 13.9% (p < 0.001).

CONCLUSION

The existing evidence is strongly suggestive of increased PBT requirement in patients with anemia, highlighting the necessity for preoperative optimization of Hgb levels and intraoperative monitoring. While preliminary evidence demonstrates a relationship between anemia and medical complications, more research is warranted to characterize the specific association between preoperative Hgb levels and flap morbidity.

When a Good Flap Turns Bad: A Temporal Predictive Model for Free Flap Complications

BACKGROUND

 Microsurgical cases are complex plastic surgery procedures with a significant risk of acute postoperative complications. In this study, we use a large-scale database to investigate the temporal progression of complications after microsurgical procedures and the risk imparted by acute postoperative complications on subsequent reconstructive outcomes.

METHODS

 Microsurgery cases were extracted from the National Surgical Quality Improvement Program database by Current Procedural Terminology codes. Postoperative complications were collected for 30 days after surgery and stratified into four temporal periods (postoperative days [PODs] 0-6, 7-13, 14-20, 21-30). Postoperative complication occurrences were incorporated into a weighted multivariate logistic regression model to identify significant predictors of adverse outcomes (p < 0.05). Separately, a regression model was calculated for the time between index operation and reoperation and additional complications.

RESULTS

 The final cohort comprised 19,517 patients, 6,140 (31.5%) of which experienced at least one complication in the first 30 days after surgery. The occurrence of prior complications in the postoperative period was a significant predictor of future adverse outcomes following the initial week after surgery (p < 0.001). Upon predictive analysis, overall model performance was highest in PODs 7 to 13 (71.1% accuracy and the area under a receiver operating characteristic curve 0.684); 2,578 (13.2%) patients underwent at least one reoperation within the first 2 weeks after surgery. The indication for reoperation (p < 0.001) and number of days since surgery (p = 0.0038) were significant predictors of future complications after reoperation.

CONCLUSION

 Prior occurrence of complications in an earlier postoperative week, as well as timing and nature of reoperation, were shown to be significant predictors of future complications.

Comparison of Complication Risks Following Lower Extremity Free Flap Reconstruction Based on Seven Pre-Operative Indications: Analysis of the ACS-NSQIP Database

Background: Free tissue transfer is a valuable surgical option for the reconstruction of a myriad of complex lower extremity defects. Currently, there is a paucity of data that examines the risks of complications for each of these unique indications. Methods: Patients undergoing lower extremity free flap reconstruction from the ACS-NSQIP 2011-2019 database were stratified into groups based on the etiology and indication for reconstruction. Rates of major, surgical wound, and medical complications were compared over the first post-operative month. Multivariable logistic regression was used to identify complication predictors. Results: 425 lower extremity free flaps were analyzed. The most common indications for lower extremity free flap reconstruction were wound-related (29%), malignancy (21%), and trauma (17%). Seventeen percent of free flaps had a major post-operative complication, 9% had a surgical wound complication, and 16% had a medical complication. There were no significant differences in major complications between the indications. However, the independent risk factors for major complications varied widely. Those with an indication of malignancy and those who received a musculocutaneous free flap were significantly more likely to have a surgical wound complication compared to the remaining cohort (p < 0.05). Those requiring free flap reconstruction for orthopedic hardware related concerns as well as those with wound related indications were significantly more likely to have a post-operative medical complication (p < 0.05). Conclusion: Understanding the unique risk profiles between the various indications and populations of patients undergoing lower extremity free flap reconstruction is critical for providing accurate risk estimations and optimizing post-operative outcomes and monitoring. Keywords microsurgery, lower extremity free flap, free flap reconstruction.

The Hidden Risks of Perioperative Transfusions in Traumatic Lower Extremity Free Flap Reconstruction

BACKGROUND

 Blood transfusions have been associated with surgical complications; however, these studies are not specific to lower extremity (LE) reconstruction. We evaluated the effect of perioperative packed red blood cell (PRBC) transfusions on LE free flap outcomes in trauma patients.

METHODS

 Patients undergoing LE free flap reconstruction following acute injuries from 2016 to 2021 were retrospectively analyzed. The perioperative period for transfusions was defined as ± 3 days from the procedure. Parameters included demographics, perioperative characteristics, and outcomes. Major complications were complications requiring reoperation. Univariate and multivariate analyses were performed to identify associations.

RESULTS

 Of the 205 patients, 48% received PRBCs perioperatively. There was a trend toward higher major complications rate in the transfusion group (19 vs. 10%, p = 0.09). Wound size, injury severity score (ISS), and intraoperative estimated blood loss were greater in the transfusion group (p < 0.01). Preoperative hemoglobin/hematocrit were lower in the transfusion group (p < 0.001). Units of PRBCs transfused were independently associated with major complications on multivariate analysis (odds ratio [OR] = 1.34, confidence interval [CI]: 1.06-1.70, p = 0.015) and length of hospital stay (LOS; OR = 1.05, CI: 1.02-1.08, p = 0.002). Infection, wound size, ISS, and preoperative hemoglobin/hematocrit were independently associated with increased LOS (p < 0.05) but not with major complications.

CONCLUSION

 The number of units of PRBCs given perioperatively was the only variable independently associated with major complications on multivariate analysis and was one of many variables associated with increased LOS. These findings suggest the usage of restrictive transfusion protocols in trauma patients requiring LE reconstruction.

Elevating Lower Extremity Reconstruction: An Algorithmic Approach to Free Flap Re-elevation

BACKGROUND

 Free flap (FF) reconstruction is frequently required for soft-tissue coverage after significant orthopaedic trauma of the lower extremity (LE). While usually the final step in limb salvage, re-elevation of the previously inset FF may be necessary to restore a functional limb. In this study, we present our algorithm for LE FF re-elevation and review our experience to identify factors associated with successful limb salvage and return to ambulation.

METHODS

 A retrospective, single-institution review was conducted of adult patients with LE wounds who required FF reconstruction from 2016 to 2021. From this cohort, patients who required re-elevation of their LE FF were identified. Successful FF re-elevation was defined by limb salvage and return to ambulation.

RESULTS

 During the study period, 412 patients with LE wounds required flap reconstruction. Of these patients, 205 (49.8%) underwent free tissue transfer, and 39 (9.5%) met our inclusion criteria. From this cohort, 34 had successful FF re-elevation, while 1 was non-weight bearing and 4 were elected for amputation due to chronic complications unrelated to their FF. Univariate analysis revealed the total number of FF re-elevations (p < 0.001), the frequency of re-elevation indicated for orthopaedic access (p < 0.001), and infections necessitating return to the operating room (p = 0.001) were each negatively associated with limb salvage and return to ambulation.

CONCLUSION

 The described algorithm highlights the preoperative planning and meticulous flap preservation necessary for the successful coverage of critical structures following FF re-elevation. Our data demonstrate that LE FFs can be safely re-elevated for hardware access or flap revision. In these complex cases of LE trauma, management by a multidisciplinary team is essential for successful limb salvage.

A nomogram for predicting outcomes following pedicled flap reconstruction of the lower extremity

INTRODUCTION

Lower extremity reconstructions with soft tissue flaps account for a significant proportion of reconstructive surgery. Pedicled flaps are a procedure of choice, particularly in multimorbid patients and those with small to medium-sized defects. Complication rates are high and should not be underestimated, with accurate preoperative risk factor assessment being imperative.

METHODS

Using the American College of Surgeons National Surgical Quality Improvement Program Database (2008-2021), we analyzed all patients who underwent pedicled flap reconstruction of the lower extremity. Demographic data, comorbidities, and perioperative data were extracted. We identified risk factors of major surgical complications within 30 days of surgery through uni- and multivariate regression analyses. On this basis, a nomogram for predicting the risk of complications was developed to allow for feasible point-of-care risk assessment.

RESULTS

A total of 6475 adult patients were identified. The most common comorbidities were hypertension (n = 3363, 51.9%) and obesity (n = 2306, 35.6%) and most common American Society of Anesthesiologists (ASA) class was class 3 (n = 3703, 57.2%). The most common complication was bleeding/transfusion (n = 1293, 19.9%). Multivariate regression revealed longer procedures, inpatient setting, higher ASA scores, hypertension, and procedures performed by orthopedic and vascular surgeons as predictors for higher risk of post-operative complications.

CONCLUSION

Leveraging a risk- and case-mix-adjusted multi-institutional database, a nomogram for post-operative surgical complications within 30 days after pedicled flap reconstruction in the lower extremity was developed. This broadly applicable risk prediction tool can aid in decision-making when assessing patient eligibility.

A novel intervention for wound bed preparation in severe extremity trauma: Highly concentrated carbon dioxide bathing

Introduction

In severe extremity trauma involving large tissue defects, early closure (e.g., free-flap surgery) of the defects is an essential step for good functional reconstruction; however, in some cases, early closure may be difficult. Highly concentrated carbon dioxide bathing, used to improve blood flow in ischemic limbs and skin ulcers, can also be applied in wound bed preparation for severe limb trauma.

Patients and Methods

The three cases in this study required an average of 13 weeks of highly concentrated carbonated bathing, which led to significantly better wound bed preparation, even in the exposed bone and tendon regions.

Results

We successfully achieved good functional limb reconstruction in patients with deep burns and severe open fractures by reducing wound infection and facilitating good wound bed preparation.

Conclusions

Highly concentrated carbon dioxide bathing was sufficient to prevent frequent wound infections, even in severe extremity trauma involving large soft-tissue defects such as deep crush burns and Gustilo Anderson classification ≥3b open fractures of the extremities. To our knowledge, such interventions have not been reported in the past and are valuable as new procedures for wound bed preparation in severe extremity trauma from both cost and wound infection control perspectives.

Soft Tissue Coverage for Foot and Ankle Trauma

Lower extremity trauma can result in extensive soft tissue loss, which can require a staged multispecialty approach. Flaps can be an excellent choice for significant soft tissue loss. A variety of variables goes into the selection of a flap including understanding what the recipient site needs, available donor sites, nature of trauma, and utilization of indices to predict limb salvageability in order to strategically select the correct flap option.

The cross-leg free flap: A systematic review of the literature

BACKGROUND

Free tissue transfer is a mainstay treatment for lower extremity soft tissue injuries. When the traditional cross-leg flap cannot provide enough coverage, a cross-leg free flap (CLFF) is a limb-saving alternative. The aim of this study is to conduct a systematic review of the literature published on the CLFF.

METHODS

We conducted a systematic review of articles describing the CLFF, according to Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. Inclusion criteria included articles with primary data on the CLFF. Exclusion criteria included those describing pedicled cross-leg flaps or lacking complete data. Data analysis was performed using SPSS 29.0.

RESULTS

Our review included 28 articles encompassing 130 patients who underwent free tissue transfer. Most were male (63.8%) with a mean age of 32.4 years. Latissimus dorsi was the most common flap type (30.0%), followed by vertical rectus myocutaneous (20.0%). Average flap size was 301.8 cm2 , with trauma in the lower third of the leg being the most common indication (73.1%). The contralateral posterior tibialis was the most common recipient artery (84.1%) followed by the anterior tibialis (9.5%). Complications included amputation (1.4%), partial graft loss, thrombosis, hematoma, prolonged pain, nonunion, and seroma; a forest plot was used to illustrate the low overall adverse events rate. Although bivariate analysis identified age, flap size, type, location, and donor site as variables significantly impacting the incidence of complications (p < .05), this was not sustained in a multivariate logistic regression model.

CONCLUSION

The CLFF remains an excellent option for limb salvage when a suitable recipient vessel is unavailable. Our review demonstrates 1.4% flap failure and an acceptable complication rate. While most cases in our review describe muscle flaps, we report a complex case of limb salvage using an unusually large anterolateral thigh flap.

The impact of COVID-19 pandemic on free tissue transfer outcomes: A NSQIP analysis

BACKGROUND

The COVID-19 pandemic significantly impacted hospital resources and patient care, although its effect on free tissue transfer procedures is poorly understood. We conducted the current study to investigate the potential impact of COVID-19 and its accompanying system shut-downs on the surgical outcomes of patients undergoing free flap procedures.

METHODS

Patients undergoing free tissue transfer procedures were identified from the National Surgical Quality Improvement Program (NSQIP) database from 2016 to 2020. We used 2016-2019 as baseline (pre-pandemic) data to compare with 2020 (peri-pandemic). We divided the patients into the following 3 groups: all patients undergoing free tissue transfer, breast reconstruction free tissue transfer, and non-breast free tissue transfer cases. Outcomes of interest included patient morbidity/mortality, time to surgery, time to takeback, and length of hospital stay. We used Pearson's chi-square and Fisher's exact tests to assess categorical variables. Wilcoxon's ranked sign tests and ANOVA tests were used for non-parametric and parametric continuous variables, respectively. Significance was set at alpha < 0.05.

RESULTS

When comparing peri-pandemic to pre-pandemic rates, patient morbidity and mortality and unplanned primary or secondary takeback operations were both significantly higher in all 3 groups peri-pandemic. Median time to primary or secondary takeback operation was also significantly greater peri-pandemic.

CONCLUSION

Patients undergoing flap procedures peri-pandemic had an overall increase in median morbidity and mortality, unplanned primary or secondary takebacks, and median number of days to takebacks compared to the pre-pandemic period. This is concerning given that any future protocols instituted can have detrimental effects on patients who receive a free tissue transfer procedure.

Evaluation of modified frailty index for predicting post-operative outcomes after lower-extremity free-flap reconstruction

BACKGROUND

Risk stratification for complex procedures such as microsurgical reconstruction of the lower extremities is an important part of preoperative planning and counseling. The aim of this study was to determine the effectiveness of the modified five-item frailty index (5-mFI) score, a validated tool for assessing risk in surgical patients, in predicting postoperative complications after lower extremity (LE) free flap reconstruction.

METHODS

A retrospective review of the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database was conducted from 2010 to 2020 on patients who underwent LE free-flap reconstruction. 5-mFI scores were calculated and patients were categorized as 5-mFI ≥2 or <2. The primary endpoint was the presence of 30-day overall complications. The secondary endpoints included 30-day readmission, need for reoperation, and need to discharge to a care facility. Comparisons were made using one-way analysis of variances, Pearson's chi-squared test, or Fisher's extract test. Multivariable logistic regression models were performed for sex, age, BMI, smoker status, operative time, and ASA classification.

RESULTS

Total of 294 (61.6% males) patients were identified. Univariate analysis showed 5-mFI ≥2 had higher rates of overall complications (p = .043) and hematologic complications (p = .033). In this population, there were also higher rates of reoperation (p = .003) and discharge to care facility (p < .001). Multivariable regression models further substantiated that 5-mFI ≥2 was independently associated with increased overall complications [2.46, CI: 1.10-5.59, p = .031], hematologic complications [2.55, 1.02-6.35, p = .046], reoperation [4.55, 1.54-13.3, p = .006], and discharge to facility [2.86, 1.27-6.45, p = .011].

CONCLUSIONS

There is a strong association of 5-mFI ≥2 with adverse post-operative outcomes in male patients undergoing LE free-flap reconstruction. This can be a valuable adjunct in the counsel of patients for whom lower extremity salvage is feasible.

Timing of Unplanned Reoperation After Lower Extremity Free Flap Reconstruction: What Are the Roles of Procedure Indication and Defect Etiology?

BACKGROUND

Advancements in lower extremity (LE) microsurgery have allowed for the expansion of indications for LE reconstructions. This project aims to better understand the temporal pattern and risk factors associated with LE free flap failure based on the clinical indication.

MATERIALS AND METHODS

We analyzed all patients undergoing LE free flap reconstruction from the American College of Surgeons National Surgical Quality Improvement Program 2012-2019 prospectively collected data to determine rates and timing of reoperation. Free flaps were stratified by indication, type, and timing of reoperation. Weibull survival models were used to compare rates of takebacks among time intervals. Multivariable logistic regression was used to identify independent predictors for unplanned reoperation.

RESULTS

Four hundred seven of LE free flaps were analyzed. There was a 14.5% rate (59/407) of unplanned reoperation within the first 30 postoperative days (PODs) after surgery. When stratified by the indication necessitating reoperation, patients with an underlying vascular indication had the highest rate of reoperation (40.9%). The reoperation rates were significantly different between indications (P < 0.05) The mean daily proportion of patients experiencing reoperation was highest during POD 0 to 2 (1.47% reoperations per day), which dropped significantly during POD 3 to 10 (0.55% per day) and again during POD 11 to 30 (0.28% per day, P < 0.05). African American race as well as malignant, prosthetic/implant, and wound/infectious indications were significant independent predictors for unplanned reoperation.

CONCLUSIONS

Lower extremity reconstruction is an important reconstructive option for the coverage of a myriad of defects. Understanding the differences between postoperative reoperation timelines among indication subtypes is important for updated flap monitoring protocols, optimizing ERAS pathways, and beginning dangle protocols.

Chemoprophylaxis and Management of Venous Thromboembolism in Microvascular Surgery

This review aims to highlight the common pharmacological and nonpharmacological interventions utilized for thromboprophylaxis as well as flap salvage in microsurgery. A literature review was conducted in PubMed/National Center for Biotechnology Information, Scopus, Web of Science, and MEDLINE databases. Articles with a focus on thromboprophylaxis in microsurgical procedures spanning head and neck surgery, breast and extremity microvascular reconstruction, deep venous thrombosis/pulmonary embolus in microvascular surgery, and flap thrombosis and salvage were included in this review. The majority of available evidence supports mechanical venous thromboembolism (VTE) prophylaxis in all patients undergoing microsurgery given the presence of multiple risk factors for VTE within this particular patient population. Based on the literature review, addition of VTE chemoprophylactic agents is beneficial and an algorithmic approach to thromboprophylaxis in microsurgery patients and management of patients with thrombosis based on literature review and senior authors' experience is recommended and outlined.

One or two venous pedicles by anastomoses for free flaps in reconstruction of the lower extremity: A systematic review and meta-analysis

BACKGROUND

Microsurgical free tissue transfers are a mainstay of lower extremity reconstruction. Despite being a reliable source of soft tissue, complications do arise. Venous congestion is among the most common causes of flap failure in lower extremity reconstruction, an issue that is attributed to venous stasis and impaired venous return in this region. There remains significant debate whether dual venous drainage improves outcomes. The aim of this study was thus to compare one versus two venous anastomoses in lower limb free flap reconstruction.

METHODS

A systematic review of Medline, EMBASE, EBSCO CINAHL, SCOPUS, Proquest Dissertations and Theses Global, Cochrane Library, and PROSPERO from inception to May 20, 2020, was conducted. Two independent reviewers screened titles and extracted data. Our primary outcome was total free flap necrosis. Secondary outcomes were partial flap necrosis, minor complications, flap reoperation, venous thrombosis, and amputation. Methodological quality was assessed using the MINORS criteria and level of evidence.

RESULTS

Three-hundred and fourteen unique titles were identified. All studies were level VI evidence and had a mean MINORS score of 16.1/24. Seven studies (comprising 1499 patients, 910 single venous anastomoses, and 579 double venous anastomoses) met criteria for inclusion. The mean (SD) patient age was 46.5 (7.1) years. Double venous anastomoses did not reduce the rate of minor complications, flap takeback, venous thrombosis, total flap necrosis, or partial flap necrosis when compared to a single vein (all p > .05).

CONCLUSION

In microvascular lower extremity reconstruction, two venous anastomoses did not reduce the rate of minor or major complications.

Outcomes of Patients With Nonunion After Open Tibial Shaft Fractures With or Without Soft Tissue Coverage Procedures

OBJECTIVES

To evaluate the outcomes of patients who underwent soft tissue flap coverage during treatment of a tibia fracture nonunion.

DESIGN

Retrospective analysis on prospectively collected data.

SETTING

Academic medical center.

PATIENTS/PARTICIPANTS

One hundred fifty-seven patients were treated for a fracture nonunion after a tibia fracture over a 15-year period. Sixty-six patients had sustained an open tibial fracture initially and 25 of these patients underwent soft tissue flaps for their open tibia fracture nonunion.

INTERVENTION

Manipulation of soft tissue flaps, either placement or elevation for graft placement in ununited previously open tibial fractures.

MAIN OUTCOME MEASUREMENTS

Bony healing, time to union, ultimate soft tissue status, postoperative complications, and functional outcome scores using the Short Musculoskeletal Functional Assessment (SMFA). This group was compared with a group of open tibial fracture nonunions that did not undergo soft tissue transfer.

RESULTS

Bony healing was achieved in 24 of 25 patients (96.0%) who received flaps at a mean time to union of 8.7 ± 3.3 months compared with 39 of 41 patients (95.1%) at a mean 7.5 ± 3.2 months (P > 0.05) in the noncoverage group. Healing rate and time to union did not differ between groups. At latest follow-up, the flap coverage group reported a mean SMFA index of 17.1 compared with an SMFA index of 27.7 for the noncoverage group (P = 0.037).

CONCLUSIONS

Utilization of soft tissue flaps in the setting of open tibia shaft nonunion repair surgery are associated with a high union rate (>90%). Coverage with or manipulation of soft tissue flaps did not result in improved bony healing rate or time to union compared with those who did not require flaps. However, soft tissue flap coverage was associated with higher functional scores at long-term follow-up.

LEVEL OF EVIDENCE

Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

NPWTi allows safe delayed free flap repair of Gustilo IIIb injuries: A prospective case series

Introduction

Free flap lower extremity repair is associated with a high complication rate (>31%); higher rates are observed in more severe patients. In cases requiring prior systemic/local stabilization, delayed repair increases complication rate (+10% at 7 days): Negative-pressure Wound Therapy (NPWT) decreases complications but only when applied for less than 7 days. Recent limited evidence suggests that augmentation of NPWT with instillation for wound irrigation (NPWTi) might safely extend such window. This study hypothesizes that, through the combined cleansing effect of NPWT and instillation, NPWTi allows safe (low complication rate) delayed free flap repair in severe patients with Gustilo IIIb injuries (GIIIb).

Methods

A prospective case series was designed (inclusion criteria: GIIIb requiring microsurgical repair, severe patient/injury condition preventing immediate/early repair; exclusion criteria: allergy to NPWTi dressing). Patients received NPWTi (suction: 125 mmHg continuous; irrigation: NaCl 0.9%) until considered clinically ready for repair. Preoperative/postoperative complications (dehiscence, wound infection, bone non-union, osteomyelitis, flap failure) were monitored with clinical signs, imaging, and serum markers (CRP, WBC).

Results

Four patients (male: N = 4, female N = 1; Age: 59 [44-75] years-old) were treated. NPWTi was applied for 15.2 [9-28] days. No complication (0%) was observed preoperatively or postoperatively. Delayed repair occurred by latissimus dorsi musculocutaneous flap (N = 3), and anterolateral thigh flap (N = 2). All patients walked weight-bearing 12 [6-20] weeks after injury.

Conclusions

NPWTi seems to allow safe delayed free flap repair in patients with severe lower extremity injuries unable to undergo immediate/early repair.