Soft tissue free flap for reconstruction of upper extremities: A meta‐analysis on outcome and safety

Propeller Perforator Flaps Used for Hand and Digit Reconstruction: A Systematic Review

Background

Propeller perforator flaps (PPFs) have increased in popularity due to the freedom in design and ability to cover a variety of defects without sacrificing the major vessels. Present reports of PPFs for upper limb reconstruction have not provided guidance for hand reconstruction, specifically. This study aims to review the current literature and evaluate techniques for use of PPFs in hand reconstruction.

Methods

A comprehensive literature review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines for articles published from 1991 to 2021. The database search was queried for records using appropriate Medical Subject Headings (MeSH) terms. Studies reporting PPFs were limited to English language and excluded lower extremity or upper extremity reconstruction not specific to defects in the hand or digits. Study characteristics, patient demographics, indications, preoperative testing, flap characteristics, flap survival, and complication rates were collected.

Results

Out of the initial 1,348 citations yielded, 71 underwent full-text review. Ultimately, 25 unique citations were included encompassing 12 retrospective reviews (48%), 3 prospective cohort studies (10%), and 10 case series (40%). In review, 525 patients underwent reconstruction with a total of 613 propeller flaps performed to repair defects of the hand, digits, or both with use of 18 unique flap types. Overall flap survival was 97.8%. Acute wounds accounted for 72.9% of performed reconstructions. The mean flap coverage was 14.7 cm2. Complications occurred in 19.8% of cases, with venous congestion and partial flap necrosis occurring in 5.5 and 6.5% of cases, respectively, leading to a flap failure rate of 2.1%.

Conclusion

PPFs are a reliable option for hand or digital reconstruction, allowing surgeons to cover a variety of defects without sacrificing local vasculature. Despite nearly a 20% reported complication rate, nearly all flaps with venous congestion and partial flap necrosis included in these articles resolved without the need for secondary intervention, retaining an excellent overall flap survival.

Catastrophic complications following microvascular free tissue transfer: A 10-year review of NSQIP data

INTRODUCTION

There is an absence of literature regarding the risks of catastrophic medical outcomes (CMOs) such as stroke, cardiac arrest, and pulmonary embolism in microvascular free tissue transfer. This study aims to determine the CMO and mortality rates, as well as risk factors, associated with microvascular reconstruction of the head and neck, extremity, and breast.

METHODS

This study uses data from the American College of Surgeons National Surgical Quality Improvement Program. Cases of microvascular free tissue transfer from 2012 to 2021 were analyzed to assess the 30-day rates of CMOs, including death, as well as associated risk factors.

RESULTS

Of the 22,839 included patients, 785 (3.44%) experienced 1043 CMOs, including 99 (0.43%) deaths. Pulmonary complications of prolonged respiratory failure and pulmonary embolism were the most common. Independent risk factors included age, male sex, underweight status, longer operation times, American Society of Anesthesiologists (ASA) class of III or above, wound classification other than clean, and underlying conditions such as diabetes, hypertension, chronic obstructive pulmonary disorder, dyspnea, metastatic cancer, and ventilator dependence. CMOs were associated with an average 10-day delay in hospital discharge. Multivariate regression analysis revealed that head and neck reconstructions were associated with increased risk of CMO (OR 4.96; p < 0.0001).

CONCLUSION

This is the largest study to examine CMOs following microvascular free tissue transfer. Compared to previous literature spanning the period between 2006 and 2011, we observed a decreased rate of CMOs but a slight increase in 30-day mortality. Our data provide updated and comprehensive criteria for risk stratification and patient counseling. The modifiable risk factors reported in our study should be considered in elective, non-urgent cases of microvascular reconstruction.

Posterior perforator tibial artery flaps for soft tissue defects of limbs: a retrospective cohort study

PURPOSE

To investigate the clinical effect of posterior perforator tibial artery flaps on repairing soft tissue defects of limbs.

METHODS

From June 2012 to June 2021, 14 cases of soft tissue defects of limbs were repaired with pedicled or free flaps of posterior perforator tibial artery. Among them, there were 9 cases of pedicled flaps and 5 cases of free flaps. The donor sites were closed directly or covered with skin grafting. The defects area varied from 3 × 5 cm to 7 × 16 cm. All cases were followed up for 1 year to 2 years.

RESULTS

All flaps survived completely except 3 cases with distal end necrosis and the 3 cases healed after dressing change. There were not any other complications at both donor and recipient sites. Appearance of the recipient sites was close to the surrounding skin. All patients were satisfied with the results.

CONCLUSION

Posterior perforator tibial artery flaps have the advantages of relatively simple technique, few damage, few complications and satisfying appearance. It is a good choice for soft tissue defects of limbs.

Adipofascial Perforator Flaps for Peripheral Nerve Resurfacing after External Neurolysis

Background: External neurolysis is an important approach to treating symptomatic peripheral nerve entrapment. In cases of recurrent neurolysis or particularly extensive neurolysis, a paucity of overlying soft tissue for closure over the freshly liberated nerve presents a challenge to long-term surgical success as primary closure of this tissue may predispose the patient to recalcitrant epineural scarring. We report the intermediate term outcomes of the use of adipofascial perforator flaps as a means of vascularised tissue resurfacing of nerves in these difficult scenarios. Methods: We retrospectively reviewed patients undergoing external neurolysis for painful peripheral nerve lesions who subsequently had soft tissue reconstruction with local adipofascial flaps. Data with regard to age, gender, limb involved, duration of symptoms, number of prior surgeries, operative time, type of flap, vascular basis of flap, duration of follow-up, visual analogue pain score, monofilament sensory testing and complications were collected. Results: We included six patients (four women) with a minimum follow-up period of 17 months (range: 17-25 months). Age ranged from 39 to 60 years of age. Four cases involved the upper extremity and two the lower extremity. Symptoms had been present between 1 and 10 years. All operations utilised a local adipofascial flap perfused by a named perforating vessel emanating from an adjacent axial vessel. Operative time for flap creation and inset was 74 minutes, on average. There was one minor complication owing to superficial wound dehiscence. All patients reported substantial pain relief (≥five-point reduction on visual analogue scale; scores 0-3 at last follow-up) and objective sensory testing demonstrated improvement. Conclusions: Our report pays particular attention to surgical technique that is applicable to both upper and lower extremities in addition to intermediate term safety and pain outcomes. Level of Evidence: Level IV (Therapeutic).

Temporal Fascia Free Flap for Thumb Coverage in Electrical Burn Injuries: A Case Series Analysis With DASH Score Outcomes Evaluation

Electrical burns pose unique challenges in reconstructive surgery due to the extensive tissue damage they cause. The thumb is particularly susceptible to electrical burns, leading to severe functional impairment. This case series introduces the use of the temporal fascia free flap for thumb coverage in patients with electrical burn injuries. The study aims to assess the functional outcomes of this approach using the Disabilities of the Arm, Shoulder, and Hand (DASH) questionnaire. Six male patients underwent thumb reconstruction using temporal fascia free flaps following electrical burn injuries. The extent of the injury was assessed, and necrotic tissue was debrided. Functional outcomes were evaluated using the DASH questionnaire 6 months postoperation. All procedures were conducted in accordance with ethical guidelines, and informed consent was obtained from all patients. All patients achieved successful transplants using temporal fascia free flaps. The average DASH score at the 6-month follow-up indicated satisfactory functional recovery. Patients reported improvements in thumb mobility and functionality, and the cosmetic appearance of the thumb was acceptable. The appearance of the scar in the donor area was well-received. The temporal fascia free flap proved to be an effective method for thumb reconstruction following electrical burn injuries. Its thin and flexible nature allows for optimal contouring and improved range of motion. Although one case of partial flap loss was observed, overall functional and aesthetic outcomes were satisfactory. Further research with larger sample sizes is warranted to optimize surgical techniques and postoperative care for better outcomes.

Robot-assisted Microsurgery: Lessons Learned from 50 Consecutive Cases

Background

The potential of robot-assisted surgery in plastic and reconstructive surgery remains to be established, especially in free tissue transfer. This prospective study aimed to present our experience and findings from the first 50 consecutive cases of robot-assisted microsurgery using the Symani surgical system.

Methods

A prospective database was maintained, recording patient demographics and surgical details for all cases of robot-assisted microsurgery in a large academic institution. All surgeons underwent an intensive training program with the Symani surgical system.

Results

A total of 50 patients who underwent robot-assisted microsurgical reconstruction were identified. Free microsurgical tissue transfer was performed in 45 cases, targeted muscle reinnervation in four cases, and lymphovenous anastomoses in a single case. A total of 94 robot-assisted anastomoses and coaptations were performed, (46 venous and 30 arterial anastomoses, 16 nerve coaptations, two lymphovenous anastomoses). Six cases involved perforator-to-perforator anastomoses. Ninety-eight percent of attempted anastomoses were completed using the robot. Size-mismatch anastomoses, seen in 37.8% of cases, took significantly longer. Minor complications occurred in three cases and major in six cases. There were three cases of microvascular compromise requiring revision. One partial flap loss and no complete flap loss occurred.

Conclusions

Our study highlights the immense potential of robot-assisted microsurgery, and a feasible and effective modality for various microsurgical procedures, with outcomes comparable to those of conventional microsurgery. Despite challenges, such as increased operating times and higher costs, the technology offers significant advantages, such as enhanced precision and motion scaling. We identify a slow learning curve and a necessity for higher caseloads.

Diagnostical accuracy of hyperspectral imaging after free flap surgery

Microsurgical free-tissue transfer has been a safe option for tissue reconstruction. This study aimed to analyze the diagnostic accuracy of hyperspectral imaging (HSI) after free-tissue transfer surgery. From January 2017 to October 2019, 42 consecutive free-flap surgeries were performed, and their outcomes were analyzed via HSI. Clinical examination of free-flap perfusion was initially performed. Clinical examination findings were subsequently compared with those of HSI. Potential venous congestion with subsequent necrosis was defined as a tissue hemoglobin index of ≥53%. Student's t-test was used to compare the results of the analysis. The evaluation of sensitivity and specificity for flap failure detection was time dependent using the Fisher's exact test. A p-value of ≤0.05 was considered statistically significant. Microsurgical tissue transfer success rate was 84%. Seven patients presented with venous congestion that caused total flap necrosis. Overall, 124 assessments were made. HSI accurately identified 12 out of 19 pathological images: four as false positive and seven as false negative. The sensitivity and specificity of HSI were 57 and 94%, respectively, compared to those of clinical examination that were 28 and 100%, respectively, within 24 h following tissue transfer. The sensitivity and specificity of HSI were 63 and 96%, respectively, compared to those of clinical examination that were 63 and 100%, respectively, within the first 72 h. A tissue hemoglobin index of ≥53% could predict venous congestion after free-flap surgery. HSI demonstrated higher sensitivity than clinical examination within the first 24 h; however, it was not superior compared to clinical findings within 72 h.

Venous end-to-side anastomosis for free-flap reconstruction in the extremities: A case series and meta-analysis

This case series aimed to investigate the result of venous end-to-side (ETS) anastomosis in the extremities to contribute to a meta-analysis to evaluate the postoperative complications of venous ETS anastomosis in the extremities. This was a single-center case series and meta-analysis of patients who underwent venous ETS anastomosis for free-flap reconstruction of the extremities. We reviewed the records of 41 free flaps in 40 patients and performed a comprehensive search of PubMed, Scopus, and Web of Science for studies published from inception to December 2022. Primary outcomes were venous thrombosis, takebacks, and total and partial flap failures. Complication rates and confidence intervals were calculated using a random-effects model. In our case series, four (12.2%) patients with five flaps were taken back to the operating room, three (7.3%) flaps were due to venous thrombosis, and three (7.3%) flaps ultimately resulted in total flap failure. Our meta-analysis demonstrated the following complication rates: 4.0% (95% confidence interval [CI], 0-18.1%; I² = 0%) for venous thrombosis, 8.5% (95% CI, 0-21.8%; I² = 0%) for takebacks, 5.8% (95% CI, 0-18.3%; I² = 0%) for total flap failure, and 8.8% (95% CI, 0-28.4%; I² = 0%) for partial flap failure. Our case series and meta-analysis showed that the result of venous ETS anastomosis in the extremities was positive, and this technique was effective for addressing venous size discrepancy; although, its superiority to end-to-end anastomosis could not be established.

From Esthetic Medicine to Optimizing Reconstructive Outcome: A Feasibility Trial on Secondary Refinement of Fasciocutaneous Anterolateral Thigh Flaps with Cryolipolysis

BACKGROUND

 Free adipocutaneous anterolateral thigh (ALT) flaps have evolved as workhorse flaps to reconstruct complex, multicompound defects. While coverage is safely achieved, flaps may remain bulky. As a standard of care, flaps are refined with liposuction, partial excision, or combination of both. Cryolipolysis is widely used for fat reduction in esthetic medicine. This pilot comparative study analyses whether cryolipolysis may serve as a safe alternative method to effectively reduce volume in fasciocutaneous flaps. Moreover, patients' satisfaction with the procedure is evaluated.

METHODS

 In this single-center, retrospective, interventional comparative cohort study, 10 patients with free subfascial ALT flaps for distal extremity reconstruction underwent cryolipolysis (60 minutes, -9°C). Circumference of the extremities and subcutaneous fat thickness were determined before (T1) and 12 weeks (T2) after cryolipolysis. Patient satisfaction was evaluated with a questionnaire of Likert's scale questions. Duration of hospital stay, intervention time, costs, and possible complications were analyzed and compared with surgical flap contouring (n = 12).

RESULTS

 All patients undergoing cryolipolysis were male, with a median age of 52 years without arterial disease-like state or deep vein thrombosis (DVT). At T2, a significant reduction of circumference of 1.8 ± 0.9 cm (p < 0.001) and subcutaneous fat layer of 7.7 ± 3.0 mm (p < 0.0001) was recorded. Overall, 90% of the patients were satisfied with the result. Cryolipolysis was well tolerated. One patient developed a second-degree frostbite which healed without further intervention. Cryolipolysis proofed to be as safe as surgical flap contouring. Hospital stay was significantly shorter (p < 0.01) and personal resources were spared when flap contouring was performed with cryolipolysis.

CONCLUSION

 This is a novel application of evolving body-contouring cryolipolysis from esthetic medicine into optimizing outcomes in reconstructive surgery. Cryolipolysis has been shown to be relatively safe and effective to reduce ALT's volume with high patients' satisfaction. This successful pilot study encourages further investigation with a prospective randomized control trial.

Seasonal Impact on Free Flap Surgery in Terms of Flap Loss and Wound Healing Disorders: A Retrospective Cohort Study of 158 Free Flaps

(1) Background: Postoperative flap loss and wound healing disorders are severe complications after microsurgical free flap surgery. Despite multiple clinical observations, a possible influence of season and external temperature on outcome are largely missing. (2) Methods: Retrospectively, data were collected from 151 patients receiving microsurgical free flaps from March 2018 to August 2019. Patients were divided into two cohorts. The winter group includes all patients who underwent surgery from October 2018 to March 2019 and the summer group al those who underwent surgery from April 2018 to September 2018. Data included demographic information, pre-existing conditions, flap characteristics, and postoperative complications like flap losses and wound healing problems. External temperatures during the first 14 postoperative days were documented and the predictor of flap loss and wound healing disorders was detected. (3) Results: In the winter group (October-March; Ø 7.24 °C) 72 patients (46 female, 24 males; Ø 57.0 years) and in the summer group (April-September; Ø 18.79 °C) 81 patients (48 female, 33 males; Ø 56.0 years) received free flap surgery. There were no significant differences in demography (age: p = 0.593; gender: p = 0.419; BMI: p = 0.141). We found a significant increase in flap loss during summer (χ²(1) = 6.626; p = 0.010; V = 0.209) strengthened by logistic regression analysis (p = 0.037; Exp(B) = 9.655). Additionally higher average temperatures 14 days postoperatively represents another main driver (p = 0.023, Exp(B) = 1.161) for postoperative flap loss. (4) Conclusions: The data confirm a significantly higher postoperative flap loss in the summer group. This information may potentially contribute to optimization of perioperative management and planning of elective and semi-elective surgeries.

[Analysis of Efficency, Cost Structure and Revenues of ALT Free Flaps in Extremity Reconstruction]

Microvascular reconstructions can be lengthy procedures lasting the entire day. As a result of unforeseeable events, the standardization of these procedures can be challenging. Moreover, the length of these procedures varies strongly, which impedes adequate scheduling and, therefore, optimal capacity utilization. Within the years 2018-2020, the duration of ALT free flap extremity reconstructions was correlated with the experience of the microsurgeon (category 1:<50 free flaps life-time experience, category 2: 50-200, category 3:>200) and comorbidities. The resulting costs were compared with the matrix of the German DRG Institute InEK. The surgical experience of the microsurgeon had a significant impact on the duration of surgery in extremity reconstruction. In due consideration of potential complications, category 2 microsurgeons were 45 minutes faster and category 3 microsurgeons were 167 minutes faster than category 1 microsurgeons. Comorbidities, by contrast, did not have a significant impact on procedure duration. Cost analysis revealed deficits for these procedures in relation to the InEK matrix. However, an additional analysis showed that the duration of surgery was within the German average while costs for personnel/OR minute were slightly below the average. According to this calculation, costs for microsurgical training were approximately 1000€/case. The reimbursement for flaps in extremity reconstruction is not entirely mapped in the German DRG system. Given the longer procedure times, microsurgical training is associated with higher costs. Defining the duration of microsurgery based on the level of expertise should result in improved adherence to schedule and more efficient utilization of the valuable operating room time.

Anterolateral thigh flap for upper extremity reconstruction in older patients

BACKGROUND

The anterolateral thigh (ALT) flap has been used in upper extremity reconstruction. However, there is no consensus about the age at which the flap can be used safely, which is a concern when applying ALT flaps for upper extremity reconstruction in older patients. We present the results of the use of ALT flap for upper extremity reconstruction in a series of older patients.

PATIENTS AND METHODS

Seventeen patients who underwent ALT flaps for soft tissue defects in the upper extremities from 2010 to 2020 were included. The patients' mean age was 63.5 (range, 26-83) years. Ten of seventeen patients were smokers. Defect locations were the dorsum of the hand in seven patients, palm in two patients, dorsum and palm in two patients, and forearm in six patients. Etiologies of the defect were traumatic in 14 patients and malignant tumor in three patients. The defect size was 8 to 25 × 5 to 11 cm. When dissecting the perforators, we preserved the surrounding small muscular and fatty tissue with the perforators and to harvest them together to prevent intima damage. Flap thinning was performed for 16 flaps to adjust the flap thickness to match defect site requirements. We used an end-to-side or interposition arterial anastomosis to regulate the blood flow.

RESULTS

The flap size was 9 to 28 × 5 to 13 cm. One patient had venous congestion and vein re-anastomosis was needed. All flaps survived. One patient had a methicillin-resistant Staphylococcus aureus infection and debridement and irrigation was needed. The mean follow-up period was 20 (range, 13-37) months. Fifteen patients returned their previous activities. The mean DASH score was 30.6 (range, 3-70).

CONCLUSIONS

Regardless of patient age or smoking status, the ALT flap was a safe and reliable surgical option for soft tissue defect reconstruction of the upper extremity.

Intraoperative Heparin Bolus and Postoperative Anticoagulation with Low Molecular Weight Heparin Increase Reliability of Microsurgical Free Flaps for Upper Extremity Reconstruction

BACKGROUND

 Microsurgery is an indispensable tool of upper extremity reconstruction addressing defect coverage and the restoration of function. Perioperative anticoagulation and antiplatelet therapy are controversially discussed with impact on microsurgical outcome, but without clear evidence. This study aims to evaluate the impact of perioperative anticoagulation and antiplatelet therapy in microsurgical upper extremity reconstruction.

METHODS

 All eligible patients treated with microsurgical upper extremity reconstruction between January 2000 and July 2014 were included in a comparative analysis to define a superior anticoagulation and antiplatelet regime in a retrospective study. Endpoints were all major complications (e.g., total flap loss, arterial and venous thrombosis) as well as minor complication.

RESULTS

 A total of 183 eligible free flaps to the upper extremity were transferred in 169 patients. Altogether, 11 arterial (6.0%) and 9 venous (4.9%) thromboses, 11 total flap losses (6.0%), and 16 cases with hematoma (8.7%) were detected. In the subgroup analysis, patients who did not receive any heparin intraoperatively (n = 21; 11.5%) had a higher rate of major complications (p = 0.001), with total flap loss being the most frequent event (p = 0.004). A trend was shown for intraoperative bolus administration of 501 to 1,000 units unfractionated heparin (UFH) intravenously to have the lowest rate of major complications (p = 0.058). Intraoperative administration of acetylsalicylic acid (n = 13; 8.1%) did not have any influence on the rate of major complications. Postoperative anticoagulation with continuous UFH intravenously (n = 68; 37.2%) resulted in more frequent complications (p = 0.012), for example, an increased rate of total flap loss (p = 0.02) and arterial thrombosis (p = 0.02).

CONCLUSION

 The results of the present study favor administration of 501 to 1,000 units UFH intravenously as an intraoperative bolus (e.g., 750 units UFH intravenously). Postoperative low molecular weight heparin subcutaneous application in a prophylactic dose given once or twice a day was associated with less complications compared with continuous infusion of UFH, although continuously applied UFH may reflect an increased risk profile.

Functional and Aesthetic Outcomes of the Anterolateral Thigh Flap in Reconstruction of Upper Limb Defects: A Systematic Review

Background

Soft tissue coverage in the upper limb after trauma, burn injury, or tumour removal is a commonly addressed problem by the plastic surgeon. The anterolateral thigh flap (ALT) is recognized as a popular free flap option for covering various types of soft tissue defects due to its versatility. We aimed to assess the functional and aesthetic outcomes of the ALT flap for reconstruction of upper limb defects.

Methods

Four electronic databases were searched (MEDLINE (PubMed), Scopus, Web of Science, and Cochrane) from inception to Feb 2021. Two reviewers independently extracted the data and performed risk assessment using the modified Downs and Black (MDB) quality assessment tool and the modified Newcastle Ottawa Scale for case series.

Results

This review included seven studies for quantitative assessment. The eligible studies had 67 patients. Included studies had used a varied number of validated upper extremity functional scoring systems; the most commonly used score was QuickDASH with mean of 21.24, DASH score was 15.5. In regard to aesthetic outcome, an overall satisfactory result was reported. A secondary debulking procedure was performed in 7 patients.

Conclusion

Further studies are recommended to ascertain the functional and aesthetic outcomes of the ALT free flap for upper limb defects, especially using standardized outcome scoring systems. This may be supplemented with a questionnaire that addresses common patient concerns (such as colour, contour, textile and hair growth) for the aesthetic outcome. Nevertheless, based on our review, the ALT flap may be a good reliable reconstructive option for upper limb defects with good functional outcome and satisfactory aesthetic results.

Development of a mathematical formula and online tool to calculate the potential maximum flap width to allow for primary anterolateral thigh donor-site closure in Caucasians

BACKGROUND

Primary anterolateral thigh (ALT) flap donor-site closure is crucial to achieve patient satisfaction, avoid burdensome secondary surgeries, and avert poor outcomes. Only vague maximum flap width recommendations have been suggested, which fall short of acknowledging individual patient habitus and thigh morphology. Therefore, we aimed at identifying a user-friendly preoperative calculation of maximum flap width for primary closure.

METHODS

A total of 429 ALT free flaps performed between 2009 and 2020 were analyzed. A total of 350 donor-sites were closed primarily (82%) and 79 (18%) were split-thickness skin-grafted (STSG). Patient demographics including sex, age, and BMI, operative details, and flap characteristics were compared to assess their impact on the outcome variable. Receiver operating characteristic (ROC) curves were plotted for all significant predictors discriminating between closure and STSG. Areas under the curve (AUCs) were calculated for each parameter combination and optimal cutoffs were determined using Youden's Index.

RESULTS

Sex, age, BMI, and flap width alone were poor discriminators. Dividing flap width by BMI and logarithmized BMI yielded AUCs of 0.91 and 0.94, respectively. Including patient sex yielded the best fitting regression model (χ²  = 251.939, p < .0001) increasing the AUC to 0.96 (95% CI: 0.93-0.98, p < .0001). The optimal cutoff value discriminated between primary closure and STSG with 90% sensitivity and 89% specificity. An online calculator of patient-individual maximum ALT width was then programmed.

CONCLUSIONS

Sex and BMI are reliable predictors of successful primary ALT donor-site closure in Caucasians. We devised a novel formula for calculating patient-individual maximum ALT widths preoperatively, predicting failure of primary closure with 90% sensitivity in our cohort, available at: https://kitteltaschenbuch.com/altwidth/calculate.htm.

New Robotic System with Wristed Microinstruments Allows Precise Reconstructive Microsurgery: Preclinical Study

BACKGROUND

Microsurgery allows complex reconstruction of tissue defects after oncological resections or severe trauma. Performing these procedures may be limited by human tremor, precision, and manual dexterity. A new robot designed specifically for microsurgery with wristed microinstruments and motion scaling may reduce human tremor and thus enhance precision. This randomized controlled preclinical trial investigated whether this new robotic system can successfully perform microsurgical needle driving, suturing, and anastomosis.

METHODS

Expert microsurgeons and novices completed six needle passage exercises and performed six anastomoses by hand and six with the new robot. Experienced microsurgeons blindly assessed the quality of the procedures. Precision in microneedle driving and stitch placement was assessed by calculating suturing distances and angulation. Performance of microsurgical anastomoses was assessed by time, learning curves, and the Anastomosis Lapse Index score for objective performance assessment.

RESULTS

Refined precision in suturing was achieved with the robot when compared with the manual technique regarding suture distances (p = 0.02) and angulation (p < 0.01). The time required to perform microsurgical anastomoses was longer with the robot, however, both expert and novice microsurgeons reduced times with practice. The objective evaluation of the anastomoses performed by novices showed better results with the robot.

CONCLUSIONS

This study demonstrated the feasibility of performing precise microsutures and anastomoses using a new robotic system. Compared to standard manual techniques, robotic procedures were longer in time, but showed greater precision.

A retrospective evaluation of 182 free flaps in extremity reconstruction and review of the literature

Introduction: During the past decades, free flaps have been given a central role in the reconstructive surgery. Especially in the extremities, where there is a scarcity of available tissues for local flaps, free flaps play a central part. The aim of this study was to evaluate the risk factors contributing to partial and total flap failure. Patients and methods: In a retrospective cohort study, all data concerning patients who underwent free flap reconstruction of the extremities during the first five years since the founding of the department of plastic surgery were gathered. Patient- and surgery-related risk factors were analyzed in correlation to the postoperative complications. Results: In total, 182 free flaps were included in this study. Partial and total flap failure were noted in 21.42% and 17.03%, respectively. A correlation was seen between the time lapsed from debridement until flap coverage, with flaps performed between day 4 and 14 having the least quote of flap failure (p=0.022). Gender, age, arterial hypertension, nicotine abuse, diabetes mellitus, peripheral arterial disease and the number of anastomosed veins were not significantly associated with free flap failure. Conclusion: Our study showed that free flaps can be safely performed in healthy patients as well as in patients with risk factors, with an acceptable flap loss rate. Randomized controlled studies are needed to clarify the exact role of each risk factor in free flap surgery.

Evaluating effects of primary defatting for flap thinning on the development of perfusion-related complications in free perforator flap reconstruction

BACKGROUND

Primary defatting is suggested as an effective and appealing technique for achieving flap thinning. There has been a long-standing concern regarding its potential adverse effects on flap perfusion, for which limited clinical evidence exists. This study aimed to investigate whether primary defatting negatively influences the outcomes of free perforator flap reconstruction.

METHODS

Patients who underwent upper or lower extremity reconstruction using free perforator flaps between 2002 and 2020 were investigated. They were categorized into two groups according to whether they underwent primary defatting. The association of primary defatting with the development of perfusion-related complications was evaluated.

RESULTS

A total of 421 patients were included in the analysis. Perfusion-related complications developed in 61 (14.5%) cases, including 12 cases (2.9%) of total flap loss. In total, 302 patients underwent primary defatting and 119 did not. The patients who underwent primary defatting had a higher body mass index (BMI), lower rate of comorbidities, and smaller harvested flaps than the controls. Both groups had similar rates of perfusion-related complications (13.9% vs. 16.0%, p = .589), including total flap loss (3.0% vs. 2.5%, p = .799). In the multivariate analyses, primary defatting was not associated with the development of perfusion-related complications (p = .957). In the subgroup analyses, the rate of perfusion-related complications did not differ between the two groups regardless of the BMI (≥25 or <25 kg/m² ), comorbidities, and flap size (≥200, 100-200, or <100 cm² ).

CONCLUSIONS

Primary defatting does not appear to be associated with the development of perfusion-related complications in free perforator flap extremity reconstruction.

A meta-analysis evaluating risk factors for compound free flaps for upper extremity defect reconstruction comparing complications and functional outcomes of compound free flaps with and without bone components

BACKGROUND

Compound flaps offer the advantage of one stage defect reconstruction respecting all relevant tissues and early functional recovery by optimal vascularity of all components. Due to its specific vascular anatomy and the three-dimensional donor site, compound flaps with bone components may result in higher complication rates compared to soft tissue compound flaps. The meta-analysis summarizes the available evidence and evaluates whether bone components are a risk factor for periprocedural complications in upper extremity multidimensional defect reconstruction.

METHOD

PubMed and Embase were searched for all publications addressing compound free flaps for upper extremity defect reconstruction with bone or soft tissue components published between January 1988 and May 2018. The methodological quality was assessed with the American Society of Plastic Surgeons Evidence Rating Scale for Therapeutic Studies. Flap loss, thrombosis rate, early infection, hematoma, seroma, as well as donor site complications were extracted and analyzed.

RESULTS

Twelve out of 1157 potentially eligible studies (evidence-III) comprising 159 patients were finally included with publication bias for all summarized complication rates. Complication rates for flaps with/ without bone components were: total flap loss 5%, 95% CI = 3%-10% (6%/5%); partial flap loss 8%, 95% CI = 5%-15%, (9%/8%); arterial/venous thrombosis 7%, 95% CI = 4%-12%, (8%/5%)/14%, 95% CI = 9%-21% (16%/6%, P < .05) with higher risk for flaps with bone components; infection 6%, 95% CI = 3%-12% (6%/6%); hematoma 6%, 95% CI = 3%-11% (6%/5%); seroma 5%, 95% CI = 3%-10% (5%/5%); dehiscence 10%, 95% CI = 6%-17% (11%/9%).

CONCLUSION

Compound flaps for upper extremity defect reconstruction including bone components have a higher venous thrombosis rate compared to compound soft-tissue flaps.

Negative Pressure Wound Therapy as a Salvage Procedure in Venous Congestion of Microsurgical Procedures

Negative pressure wound therapy (NPWT) is widely used in skin defects, active infection, and surgical reconstruction; lately, it is being used after skin graft to improve the adhesion on the receptor area. During the last decade, another indication has been identified: the use of NPTW to avoid complications after free flaps such as venous congestion and the risk of necrosis. NPWT can be used in the initial complication of a free flap, and the venous congestions can be treated with this technique, with very good outcomes. NPWT can be established as a part of a postoperative protocol in microsurgical procedures to avoid major complications.

The Effect of Medial Sural Artery Perforator Flap on Reconstruction of Soft Tissue Defects: A Meta-Analysis With Multiple Free Soft Flaps

BACKGROUND

With the gradual popularity of relatively novel medial sural artery perforator flap (MSAPF), robust studies are needed to compare the surgical outcomes of MSAPF versus multiple free soft flaps (MFSFs) to verify the advantages and disadvantages of MSAPF.

METHODS

The authors searched PubMed, Web of Science, EMBASE, Cochrane Library, Chinese BioMedical Literature Database (CBM), and China National Knowledge Infrastructure (CNKI) until September, 2020, to identify studies that compared surgical outcomes of MSAPF and MFSFs. Two authors followed the PRISMA guidelines, individually extracted the data and performed the quality assessments. Survival rate of flaps, satisfaction degree of patients in recipient and donor site, skin grafting, and morbidity of recipient and donor site were evaluated.

RESULTS

A total of 441 cases from 7 studies were included in our analysis. No significant differences were found regarding survival rate of flaps, recipient morbidity, and recipient satisfaction degree between the 2 groups. However, MSAPF group was significantly superior to MFSFs group in terms of skin grafting, morbidity, and satisfaction degree of donor site.

CONCLUSION

Our meta-analysis showed that the MSPAF and MFSFs groups were similar in terms of survival rate of flaps, recipient morbidity, and recipient satisfaction degree. Medial sural artery perforator flap group was superior to MFSFs group in terms of morbidity and satisfaction degree of donor site. The results may prove that MSAPF is gaining popularity for a reason and is a good choice for repairing soft tissue defects.

Implementation and Validation of Free Flaps in Acute and Reconstructive Burn Care

Microsurgical free flap reconstruction in acute burn care offers the option of reconstructing even challenging defects in a single stage procedure. Due to altered rheological and hemodynamic conditions in severely burned patients, it bears the risk of a higher complication rate compared to microsurgical reconstruction in other patients. To avoid failure, appropriate indications for free flap reconstruction should be reviewed thoroughly. Several aspects concerning timing of the procedure, individual flap choice, selection and preparation of the recipient vessels, and perioperative measures must be considered. Respecting these specific conditions, a low complication rate, comparable to those seen in microsurgical reconstruction of other traumatic limb defects, can be observed. Hence, the free flap procedure in acute burn care is a relatively safe and reliable tool in the armamentarium of acute burn surgery. In reconstructive burn care, microsurgical tissue transfer is routinely used to treat scar contractures. Due to the more robust perioperative condition of patients, even lower rates of complication are seen in microsurgical reconstruction.

The Coverage of Soft-Tissue Defects Around the Foot and Ankle Using Free or Local Flaps: A Comparative Cohort Study

BACKGROUND

The purpose of this study was to compare the reconstructive outcomes of soft-tissue defects around foot and ankle with local or free flaps and attempt to provide an optimal strategy for these patients in comparison with the conventional guidelines.

METHODS

A retrospective review of all continuous patients with foot and ankle reconstruction using different flaps from 2010 to 2018 was performed. Based on the flap types, the patients were divided into 2 groups: local flap group and free flap group. Outcomes were assessed according to the flap survival rate, recipient complications, aesthetic outcomes, and donor-site complications.

RESULT

A total of 130 flaps including 47 free flaps and 83 local flaps were collected. There was no difference in flap survival rate between the 2 groups; however, a significant difference in aesthetic outcomes was noted between them: the free flap group presented a better overall aesthetic outcomes in comparison with the local flap group in terms of color and contour match. Moreover, local flaps had more donor-site morbidities including the need for skin grafting and wound infection.

CONCLUSIONS

Free flaps in wound coverage of foot and ankle can achieve better outcomes than local flaps in terms of recipient benefits and donor-site compromise with a comparable flap survival rate.

Efficacy and safety of free medial plantar flap in repair of the high-voltage electrical burns in hands

PURPOSE

The purpose of this work was to validate the efficacy and safety of free medial plantar flap in repair of hand wounds resulted from high-voltage electrical burn.

METHODS

22 patients with high-voltage electrical burn wounds were retrieved between July 2016 and July 2018 in the Affiliated Zhengzhou Central Hospital of Zhengzhou University. All the wounds were the entrance of high-voltage electrical current. After thorough debridement, the blood vessels, nerves, tendons, joints were exposed to defects with different degrees. The soft tissue defects were repaired with the free medial plantar flap repair in 12 patients and medium-thickness skin graft in 10 patients. Postoperative management was similar between the two groups.

RESULTS

All the operations were completed within 6 h. In the free medial plantar flap group, the mean follow-up period was (11.3 ± 2.4) months, ranging from 9 to 15 months, and all flaps survived; there were no vessel crises. Flaps of 10 patients healed without any complications, and local necrosis occurred in two cases, with healing after debridement. The two-point discrimination (TPD) was 7.0-11.0 mm, and the mean DASH score was 45.6 ± 7.4. In the medium-thickness skin graft group, the mean follow-up period was (10.9 ± 1.8) months. All flaps survived, and local contracture occurred in 3 cases. The TPD was 8.0-11.0 mm, and the mean DASH score was 60.7 ± 9.3.

CONCLUSIONS

The free medial plantar flap is an ideal option for repairing the hand soft defects resulted from the high-voltage electrical burn.

A Retrospective Comparative Functional and Aesthetic Outcome Study of Muscle versus Cutaneous Free Flaps for Distal Upper Extremity Reconstruction

BACKGROUND

 Function and cosmesis are crucial in upper extremity reconstruction. Yet, there persists a lack of outcome evaluations, particularly regarding differences between free flap types.

METHODS

 In a single-center retrospective analysis, outcomes were compared between patients with cutaneous or muscle free flaps for distal upper extremity reconstruction between 2008 and 2018. The Disabilities of Arm, Shoulder and Hand -Score, Michigan-Hand (MHQ), and Short Form 36 Health Survey (SF-36) Questionnaires were assessed, motor function was quantified, and self-reported measures of cosmesis were compared, including the Vancouver Scar-Scale (VSS), MHQ aesthetics-subscale (MAS), and Moscona's cosmetic validation-score (CVS).

RESULTS

 One-hundred forty-one cases were identified, with a shift toward cutaneous flaps over the study period. Muscle flaps were used for larger defects (251 vs. 142 cm², p = 0.008). Losses, thromboses, and donor-site complications were equally distributed. Partial necroses were more frequent in muscle flaps (11 vs. 1%, p = 0.015). Seventy patients with 53 cutaneous versus 17 muscle flaps were reexamined. There was no difference in the timing of flap coverage (after 16 vs. 15 days, p = 0.79), number of preceding (2 vs. 1.7, p = 0.95), or subsequent operations (19/53 vs. 5/17, p = 0.77). Patients with cutaneous flaps showed higher grip strength (25 vs. 17 kg, p = 0.046) and reported better hand function (MHQ: 58 vs. 47, p = 0.044) and general health (SF-36: 70 vs. 61, p = 0.040), as well as more favorable appearance (MAS: 71 vs. 57, p = 0.044, CVS: 77 vs. 72, p = 0.048), and scar burden (VSS: 0 vs. 3, p < 0.001).

CONCLUSION

 Cutaneous flaps yielded better motor function, self-perceived cosmesis, patient satisfaction, and quality of life in our cohort of distal upper extremity reconstructions.

Role, Management, and Outcome of Free Flap Reconstruction for Acute Full-Thickness Burns in Hands

INTRODUCTION

Severe thermal trauma to the hand can result in major impairment and reduced function due to defective healing or even extremity loss. Full-thickness injuries frequently incur exposure of tendons or bone and require an early and stable coverage with soft tissue transplants to allow for rapid induction of exercise and to preserve structures and hand function. Free tissue transfer to the hand after thermal trauma is a rare indication, and safety, management, and outcome of free flap surgery for severe acute burn injuries to the hand remains underreported.

METHODS

Patients with primary reconstructions of full-thickness burn injuries to the hand undergoing microsurgical free tissue transfer surgery were retrospectively assessed in a period from 2013 to 2016. Salvage strategy of the extremity, postoperative complications, length of hospital stay, and primary reconstructive result were quantified and analyzed. Functional outcome measures (range of motion and grip strength) were assessed during clinical follow-up examinations.

RESULTS

During the investigated period, 13 patients were identified undergoing reconstruction of 14 hands via free flap transplantation after severe burn injury in the acute phase. Nine anteriolateral thigh flaps (64%), 3 latissimus dorsi flaps (18%), 1 serratus anterior flap, and 1 tensor fasciae lata flap (7%) were performed. In all cases, salvage of the affected extremity was achieved, although 1 flap (7%) was lost during the early postoperative period requiring secondary reconstruction via pedicled groin flap. Further complications were venous thrombosis (n = 2; 14%) and hematoma (n = 2; 14%). Mean length of hospital stay was 51 days. Functional outcome during follow-up examination after an average of 9.3 months was inhomogeneous depending on the pattern of injury and ranged from complete recovery to nearly entire loss of hand function.

CONCLUSIONS

Free flap transfer can be a mandatory and valuable tool to cover full-thickness burn injuries of the hand early in the clinical course of thermal trauma and may provide extremity salvage by favorable means of reconstruction to achieve acceptable functional outcomes, in the most severe cases. Although microsurgical failure rates in burn patients are slightly higher than in free flap transfer to the upper extremity in general, it can be performed with reasonable risk-to-benefit ratio.

[Evaluation of secondary refinement procedures following free microvascular tissue reconstruction of the upper extremity]

BACKGROUND

 The primary cosmetic and functional outcome following successful upper limb salvage using free tissue transfer can often be unfavourable, which may motivate patients to undergo secondary procedures. In this study, we sought to identify predictors for secondary procedures and to analyse the type and number of these procedures.

PATIENTS AND METHODS

 Patients who underwent free tissue transfer to the upper extremity between 2010 and 2017 were included in a retrospective cohort study: patients with secondary procedures to optimise the functional and aesthetic flap design (S cohort) vs. control cohort (C cohort). A multivariate regression analysis was used to identify predictors for secondary procedures.

RESULTS

 One hundred and twenty-eight patients were included in the study (S cohort 36, C cohort 92). All in all, 56 secondary refinement procedures were performed in a mean of eight months after the initial free flap reconstruction. Most of the defects in the S cohort were localised at the hand (53 %), and upper limb salvage was mostly accomplished by fasciocutaneous and adipocutaneous free flaps (S cohort 89 %). The most frequently performed secondary refinement procedures were direct partial flap excision (61 %), followed by liposuction (16 %) and the combination of both (17 %). Furthermore, 64 % of the secondary refinement procedures from the S cohort were combined with further surgical interventions to improve hand function, e. g. tenolysis and arthrolysis. Patients with defects of the hand received secondary procedures 2.4 times more frequently (p = 0.05). Also, patients with a good general health condition (ASA 1 and 2) were six times more likely to undergo a secondary procedure (p = 0.03).

CONCLUSION

 Secondary procedures are safe and frequently requested by patients following successful free flap upper limb salvage. In particular, this applies to patients who are in a good health condition and with free flaps to the hand. Therefore, we recommend the implementation of secondary refinement procedures in the reconstructive plan to increase patient compliance and satisfaction.

Free extended posterior tibial artery perforator flap with the neurovascular plexus of a saphenous nerve branch for large soft tissue and sensory reconstruction: Anatomic study and clinical application

BACKGROUND

The posterior tibial artery perforator (PTAP) flap is a useful tool for reconstruction of soft tissue defects in the leg. However, the size and reliability of the flap largely depends on the quality of the perforator by which the flap is supplied, and the sensory recovery of the flap is limited. In this study, the anatomy of the saphenous nerve branches and their accompanying vessels was investigated, and a free extended PTAP flap with the neurovascular plexus of a saphenous nerve branch was designed for large soft tissue and sensory reconstruction in a series of clinical cases.

METHODS

Sixteen adult cadaveric legs perfused with red latex in the femoral artery were dissected. The number and location of the saphenous nerve branches and the features of their accompanying vessels were dissected and studied. From January 2016 to December 2017, six patients with soft tissue defects ranged from 8 × 2.5 cm to 21 × 4 cm were repaired by the free extended PTAP flap. The patients' average age was 48 years. The causes of the defects included machine injuries in three patients and traffic injuries in the other three. The defects located at the hand in three cases, foot in two cases, and ankle in one case. The flap was designed based on the perforators of the posterior tibial artery and included a branch of saphenous nerve. The perforator pedicle and the nerve branch were connected to the vessels and nerve in the recipient site, respectively.

RESULTS

The saphenous nerve gave off 5.8 ± 1.1 branches, with a relatively constant one issuing 8.1 ± 0.7 cm distal to the medial femoral condyle. Every nerve branch had an accompanying vessel, which connected with the PTAPs and supplied the skin. The size of the flap ranged from 10 × 3.5 cm to 23 × 5 cm. All of the flaps survived completely without complications. Follow-up varied from 6 to 12 months. All the patients obtained cold/hot sensation and pain sensation. The results of Semmes-Weinstein monofilament test ranged from 4.31(2 g) to 5.46 (26 g), and the 2-point discrimination test varied from 20 to 35 mm.

CONCLUSION

The free extended PTAP flap, containing the saphenous nerve branch and its accompanying vessels, may be an alternative for large soft tissue reconstruction with improved sensation recovery.

A neglected problem in the utilization of free anterolateral thigh flap toward reconstructing complicated wounds of extremities: the obliteration of deep dead space

Background

Deep dead space may be thought as an independent risk factor of the poor infection control after flap reconstruction in complex limb wounds. But it can be easily neglected. The conventional skin flap and musculocutaneous flap are difficult to obliterate the deep dead space in irregular shape effectively. It was investigated that the clinical application of chimeric anterolateral thigh perforator flap in the treatment of complex wounds complicated with deep dead space of the extremities in the paper.

Methods

Fifty-six cases complicated with deep dead space wounds were registered in group. Following thorough debridement and treatment with VSD, the granulation tissues grew with well-controlled infection. And then the chimeric anterolateral thigh perforator flap was used to obliterate the deep dead space and repair the wounds. The postoperative flap survival and infection conditions were evaluated.

Results

Overall, the infection was effectively controlled, without persistent exudation or sinus tract formation after wound healing. While 5 cases lost to follow-up, the remaining 51 cases were followed up until 15 months on average. Generally, the affected extremities recovered satisfactorily with normal appearances and texture of the flaps, along with normal functions. Importantly, no recurrence of infection was observed.

Conclusion

During the grafting of chimeric perforator flap pedicled with lateral thigh muscle flap, the muscle flap is recommended to obliterate the deep dead space while the skin flap is being used to cover the wound. The combination of these two technologies performed well in the repair and reconstruction of the complex wounds of the extremities, possessing potential for broader clinical application.

Coverage of soft tissue defects in acute surgery for deep burns of the limbs

Burns of the limbs affect 48.6% of burn patients. Injury mechanisms condition their depth and degree of extension. Injury of the hands and/or the joint areas entails considerable risk of retraction. Coverage is consequently doubly challenging, it is a matter not only of compensating for a soft tissue defects, but also of striving to prevent early (infectious) and late (amplitude limitation, pain, loss of function…) complications. Thoroughgoing assessment of the initial injury and associated lesions is conducive to rapid determination of a therapeutic strategy tailored to the relevant functional issues and subsequent rehabilitation. Following a summary of the epidemiological elements and the medical context of management, a review of existing treatments has been drawn up based on the data in the literature and current professional recommendations. Emergency procedures, the different types of excision and the possibilities of autologous covering and skin substitutes are reported. Last but not least, routinely validated indications are synthesized.

[Options for soft tissue reconstruction in pseudarthrosis]

BACKGROUND

Pseudarthrosis can develop as a complication after conservative or operative fracture treatment and after elective orthopedic surgery. The treatment is challenging and is made more difficult when accompanied by large soft tissue defects or impairments in wound healing. In this case close and early coordination between trauma and plastic surgeons is crucial in order to develop a coherent and interdisciplinary treatment plan.

METHODS

Due to the positive effects on bone consolidation and osteomyelitis, timely soft tissue reconstruction via a pedicled vascularized flap or free flap coverage should be preferred. If blood circulation in the affected extremity appears to be compromised, this should first be optimized by vascular intervention or bypass surgery. In atrophic, aseptic pseudarthrosis, bone and soft tissue reconstruction can be performed consecutively in one single procedure, whereas septic pseudarthrosis always require complete resection of all infected debris prior to wound closure. Examples of two commonly used free flaps are the latissimus dorsi muscle flap and the fasciocutaneous anterolateral thigh (ALT) flap. As multiple variations have been described for both procedures, the reconstructive portfolio lists many additional options available for soft tissue reconstruction. Fasciocutaneous flaps should be preferred whenever bone consolidation requires additional surgical interventions in the future.