Perforator Flaps: History, Controversies, Physiology, Anatomy, and Use in Reconstruction:

3D Technology for Autologous Breast Reconstruction: Increased Aesthetic Outcomes and Quality of Life Utilizing Patient-Specific Templates

BACKGROUND

In autologous breast reconstruction accomplishing aesthetically pleasing outcomes represents an integral challenge. Three-dimensional (3D) technology may aid in accurate flap shaping and subsequent breast appearance.

OBJECTIVES

The aim of this study was to evaluate the applicability of 3-dimensional technology for surgical planning and its influence on outcomes for breast reconstruction.

METHODS

Outcomes of 50 female patients who underwent deep epigastric artery perforator flap breast reconstruction were analyzed. The patient population was divided into 2 study groups (with 3D technology vs without), including 25 patients each. Based on individual 3D scans and simulations, patient-specific templates were utilized intraoperatively in the 3D group. Quality of life assessment and aesthetic evaluations of breast appearance were statistically evaluated and compared.

RESULTS

Various scales of the BREAST-Q showed statistically significantly better values in the 3D group (P < .05). Concerning breast appearance, patients with 3D technology rated their breast shape and projection statistically significantly higher compared to the control group (P < .05). In addition, blinded ratings of external plastic surgeons were statistically significantly higher related to shape, symmetry, and projection of breasts with 3D technology (P < .05). All patients treated with 3D technology-assisted breast reconstruction strongly recommended this approach.

CONCLUSIONS

Patient-specific templates represent a practical method for facilitating personalized flap planning and shaping. Results demonstrated that 3D technology significantly enhances breast reconstruction outcomes concerning aesthetics and postoperative quality of life.

LEVEL OF EVIDENCE: 3 (THERAPEUTIC)

Lower Lip Reconstruction With the New Ascending Mental Artery Perforator Flap

Full-thickness defects of the lower lip pose a considerable challenge for reconstructive surgeons. The primary objective should be the restoration of oral sphincter competence, achieving both functionally and aesthetically favorable outcomes. For defects involving more than one-third of the lower lip, multiple locoregional flaps have been described as the optimal solution due to their color and texture match. Unfortunately, complications such as reduction of buccal circumference or microstomia have been reported, impacting patients' quality of life. For defects exceeding 80% of the lower lip, free flaps are required. In this study, we propose the new ascending mental artery perforator flap, based on the superficial perforating branches of the ascending mental artery. We applied this technique to 11 patients undergoing lower lip cancer excisions with defects involving 30%-70%. Our primary objective was to maintain oral continence, avoiding reduction of mouth circumference or various grades of buccal microstomia. All patients were satisfied with the functional and aesthetic final outcomes checked by long-term follow-up through clinical examination and photographs/videos (from 14 to 50 mo, with an average follow-up of 26.2 mo). This surgical procedure allows us to raise a safe and easy-to-harvest locoregional flap within a relatively short operative time, bringing a great amount of similar tissue to what is required for reconstruction. Finally, the AMAP flap has been demonstrated to fulfill the main goals of lower lip reconstruction, avoiding the most frequent complications described in the literature, especially the reduction of the circumference of the mouth.

Management of Avulsive Soft Tissue Ballistic Facial Injuries

Ballistic facial injuries are rare yet challenging cases for plastic surgeons that often comprise of avulsive tissue loss. They require in-depth assessment and staged reconstruction after patient stabilization. Each anatomic region of the face holds specific considerations that should be prioritized during reconstruction. Soft tissue repair techniques of facial gunshot wounds are widely variable and range from primary closure to multistage free flaps. Large, devastating facial defects after ballistic trauma previously posed significant challenges for reconstruction; however, advances in composite tissue transplant and allografts have expanded plastic surgeons' reconstructive arsenals. The goal of this review is to focus on the fundamentals of soft tissue management and reconstruction after ballistic facial injury. Through sound surgical principles, patients may achieve optimal aesthetic and functional outcomes despite experiencing highly morbid facial ballistic injuries.

Surgical outcomes of profunda artery perforator flap in head and neck reconstruction: A systematic review and meta-analysis

OBJECTIVE

This study aims to evaluate the efficacy of the profunda artery perforator (PAP) flap in head and neck reconstruction.

METHODS

A single arm meta-analysis was performed for flap survival rate (primary outcome), reoperation for major complication, and overall complication rates (secondary outcomes).

RESULTS

The search strategy yielded a total of 295 potentially relevant publications, of which 13 were included. A total of 305 patients (males: 80.8%, n = 232/281), with a median age of 56.1 years (n = 305/305; 95% CI 53.9-63), who underwent a total of 307 PAP flap reconstructions for head and neck defects were included. Flap survival rate was 100% (n = 306/307; 95% CI 99.6%-100%), with a reoperation rate for major complications of 3.7% (n = 15/307; 95% CI 1.85%-6.1%) and an overall complication rate of 26.5% (n = 92/307; 95% CI 15.7%-38.9%). Notable postoperative complications included wound dehiscence (n = 15/307, 4.9%), delayed healing (n = 14/307, 4.6%), and wound infection (n = 12/307, 3.9%). Partial flap necrosis and hematoma occurred in 2.6% of cases (n = 8/307), while arterial and venous thrombosis were documented in 0.7% (n = 2/307) and 1.3%, respectively (n = 4/307).

CONCLUSION

The application of the PAP flap in head and neck reconstructions showed several favorable aspects, such as an exceptionally low flap failure rate, versatility in achieving variable dimensions, and a relatively low incidence of complications. PAP flap might be considered as a compelling alternative to the traditionally employed soft tissue free flaps in head and neck reconstruction.

Computed tomographic angiography in planning thoraco-dorsal artery perforator flap in breast and soft tissue reconstruction: a systematic review

OBJECTIVES

Thoraco-dorsal artery perforator (TDAP) flaps have been increasingly used in breast and soft tissue reconstruction. Perforator localization is often done using a hand-held doppler, however, false results are not uncommon. This study aimed to systematically review the literature on the value of preoperative computed tomographic angiography (CTA) in TDAP flaps examining scanning protocol, mapping technique, concordance with operative findings, and disadvantages.

METHODS

A PRISMA-compliant comprehensive search of Medline, Embase, Cochrane Library, and CINAHL databases was conducted in November 2023. We included studies evaluating CTA mapping of free and pedicled TDAPs for breast or soft tissue reconstruction using The Joanna Briggs Institute (JBI) Critical Appraisal Tools.

RESULTS

Five studies were included and considered at high risk of bias. The studies included 72 patients with a mean age of 43.8 years. Concordance between CT findings and Doppler mapping or operative visualization was reported in two studies. In three studies, CTA was combined with Doppler flowmetry, whilst dynamic infrared thermography was used in one study. Standardized scanning protocol and patient positioning were lacking in all reports.

CONCLUSIONS

This study highlights the paucity of evidence on the value of CTA in TDA perforator mapping with inconsistent outcomes and non-standardized scanning protocols. Despite difficult imaging acquisition and interpretation, 3D reconstructed images and detailed vascular anatomy may facilitate planning.

ADVANCES IN KNOWLEDGE

Further research is required to explore the practical value of CTA in TDAP planning and standardizing protocols.

Safety of performing multiple free flap surgeries by a single surgeon in a single day

BACKGROUND

With the growing popularity of the use of free flaps, surgeons may frequently encounter situations necessitating the performance of multiple free flap surgeries in a single day. Given its prolonged duration and technical complexity, concerns remain regarding their safety. This study investigated whether a single surgeon conducting multiple free flap surgeries in a day heightens the risk of complications.

METHODS

Patients who underwent free flap-based reconstruction from March 2002 to May 2023 were reviewed and categorized into 3 groups: one flap per day (Group 1), multiple flaps per day on the same patient (Group 2), and multiple flaps per day on different patients (Group 3). Outcomes, particularly perfusion-related complications (PRCs), were compared.

RESULTS

In total, 1910 cases were analyzed: 1570 in Group 1, 126 in Group 2, and 214 in Group 3. Over time, the proportion of cases in Group 3 increased. Group 3 had fewer breast reconstruction cases but more lower extremity reconstructions, with a higher prevalence of chronic wounds. Although the rates of PRCs varied among groups, multivariable analysis exhibited no association of performing multiple flaps in a day with their occurrence, regardless of breast or nonbreast reconstruction. The rate of arterial insufficiency was significantly higher in group 3 compared with group 1 after adjusting for other variables.

CONCLUSIONS

Performing multiple free flaps in a single day may not significantly increase the risks of overall PRCs. However, there appears to be a higher incidence of arterial insufficiency, emphasizing the need for careful planning and precise execution of procedures.

Comparative Study of Small Vessel (under 0.8 mm) Anastomosed Free Flap and Larger Vessel (over 0.8 mm) Anastomosed Free Flap: Does Supermicrosurgery Provide Sufficient Blood Flow to the Free Flap?

BACKGROUND

 This study aimed to quantify the blood flow of free flaps and compare the blood flow of small vessel (<0.8 mm) and larger vessel (>0.8 mm) anastomosed free flaps.

METHODS

 This retrospective study included patients treated successfully with a perforator free flap in the lower extremity between June 2015 and March 2017. A color duplex ultrasound system measured the flow volume through the pedicle by analyzing the mean flow peak velocity, flow volume, and flow volume per 100 g of the flap.

RESULTS

 A total of 69 patients were enrolled in this study. There was no statistical difference in peak velocity between the small vessel anastomosed free flap (25.2 ± 5.6) and larger vessel anastomosed free flap (26.5 ± 5.4). Flow volume (6.8 ± 4.2 vs. 6.3 ± 3.6) and flow volume/100 g (3.6 ± 3.9 vs. 6.2 ± 6.9) also did not show significant differences.

CONCLUSION

 Small vessel (<0.8 mm) free flaps showed similar flow velocity and flow volume to larger vessel (>0.8 mm) anastomosed free flaps. Blood flow to the small vessel anastomosed free flap was sufficient despite its small vessel size.

The Facial Artery Perforator Flap for Reconstruction of Facial Defects: Surgical Pearls and Clinical Series

BACKGROUND

Based on the knowledge of facial vascularity, facial artery perforator flaps could be used as potent tools for facial defect reconstruction. However, lack of experience and misconception of this technique limits the broad application in the clinical background. Here, we discussed surgical techniques based on our previous experience with facial artery perforator (FAP)-based facial defect reconstruction.

METHODS

A retrospective review of 12 patients undergoing facial defect reconstruction using an FAP flap was performed, including 8 defects in the mid-facial part and 4 defects in the nasal area generally resulted from basal cell carcinoma (8 patients), squamous cell carcinoma (3 patients), and actinic keratosis (one patient).

RESULTS

All patients received one-stage FAP flap reconstruction. The overall follow-up period was 6 to 12 months. All reconstructions were successful with satisfactory patient-reported outcome and no local recurrence. No significant complications were observed in most cases, except for one instance of partial flap loss.

CONCLUSIONS

Overall, taking advantage of FAP flaps will contribute to a good functional and esthetic outcome of facial defect reconstructions.

Perforating cutaneous vessels: A key feature of acupoints - Anatomical evidence from five-Shu acupoints in the upper limbs

Acupuncture has been proven an effective clinical treatment for numerous pathological conditions and malfunctions. However, substantial anatomical evidence for acupuncture points (APs) and meridians is still lacking, so the location of APs is relatively subjective and understanding of the biological mechanisms of acupuncture is limited. All these problems hinder the clinical applications and worldwide acceptance of acupuncture. Our long-term microsurgery experience has indicated that Perforating Cutaneous Vessels (PCVs) are highly relevant to APs but the anatomical evidence is insufficient. To address this lack, two specimens of fresh adult human upper limbs were dissected using an advanced vascular perfusion-fixation method and then examined. The results show that all 30 five-Shu APs in the upper limbs have corresponding PCVs. Both specimens showed a 100% coincidence rate between APs and PCVs, indicating that PCVs could be critical anatomical features of APs. This study also provides an anatomical basis for locating APs objectively via preliminary detection of PCVs. The findings could lead to a better theoretical understanding of mechanisms of acupuncture and the essence of meridians.

Uses of Smartphone Thermal Imaging in Perforator Flaps as a Versatile Intraoperative Tool: The Microsurgeon's Third Eye

Introduction

In this study, we evaluate the versatility of smartphone thermal imaging technology as a valuable intraoperative modality in different stages of perforator flap surgery aiming to minimize the complications and achieve the best postoperative outcome.

Patients and methods

Thermography was performed in 20 perforator flaps in 20 patients at different surgical stages in three different ways to identify the most dominant perforator: first, by measuring the surface temperature of the skin; second, by using the dynamic infrared thermography technique; and third, by assessing the perfusion pattern when the flap was supplied by each perforator separately. Thermography was used to help in discarding the least perfused area of the flap. After microvascular anastomosis, the flap reheating pattern was evaluated.

Results

Seventeen free and three pedicled perforator flaps were included. Intraoperatively, each of the selected perforators had a corresponding hotspot. The perforator with the hottest hotpot, best rewarming, and provision of best flap perfusion on thermography was found clinically dominant. After microvascular anastomosis in free flaps, rapid rewarming was recorded in 15 cases. In two deep inferior epigastric perforator flaps, no rapid rewarming was observed. The pedicle was kinked in one case and there was a venous insufficiency in another case that required a cephalic turndown. All flaps showed good perfusion on thermography after inset.

Conclusion

Smartphone thermography has proven to be a valuable, cheap, rapidly employed, and objective tool not only for the design of perforator flaps, but also for the decision making intraoperatively to achieve the best surgical outcome.

Successful Reconstruction of Complex Sacrococcygeal Defects Using Chimeric Perforator Propeller Flap

BACKGROUND

Complex soft tissue defects, which result from the surgical resection of sacral tumors, manifest as a combination of skin defects, dead space, infection, and prosthesis exposure. Because the traditional musculocutaneous flap lacks flexibility because of the close connection between the skin flap and the muscle component, the musculocutaneous flap is not suitable for reconstructing complex soft tissue defects where the dead space and skin defects are located at different sites. Furthermore, the perforator flap is also not appropriate for reconstructing complex defects because it lacks the muscular component. We considered the possibility of using the chimeric perforator propeller flap for reconstructing complex sacrococcygeal defects.

METHODS

This study included 7 patients who underwent, between July 2007 and July 2021, the reconstruction of complex soft tissue defects of the sacrococcygeal region using a chimeric perforator propeller flap.

RESULTS

Among the included cases, the etiologies were chordoma (n = 3), sacral tumor (n = 3), and squamous cell carcinoma (n = 1). In all the cases, vacuum-assisted closure therapy was used to treat wound infections before surgery. The average sizes of the skin and muscle flaps were 195.8 cm 2 (range, 100-350 cm 2 ) and 83.6 cm 2 (range, 60-140 cm 2 ), respectively. The superior gluteal artery was the source artery for the chimeric perforator propeller flap. The donor sites were primarily closed in all cases. One patient had delayed wound healing, and the secondary wound healed using conservative dressing changes. The other 6 flaps had no complications. The average follow-up time was 5.3 months (range, 1-9 months). Muscle weakness and compromised ambulation in the affected lower extremities were not observed in any of the patients. Furthermore, all 7 patients had no tumor recurrence, prosthesis exposure, and infection events in the sacrococcygeal region.

CONCLUSIONS

The chimeric perforator propeller flap may be an option for reconstructing complex soft tissue defects in the sacrococcygeal region.

A bipedicled keystone perforator island flap: Pedicle division technique with enhanced advancement potential for chronic wound coverage

Since the first description of the keystone perforator island flap (KPIF) in 2003, several modifications have been suggested to enhance its coverage ability. However, locoregional flaps have limited its use in chronic wounds due to decreased elasticity around the defect. We investigated the use of a bipedicled KPIF (bKPIF), which covers a defect while completely elevating the median part of the flap from the fascia. A retrospective chart review of 20 consecutive patients who underwent classical type I KPIF (n = 10) or bKPIF (n = 10) reconstruction from June 2020 to December 2022 was performed. Baseline characteristics, indications, operative details, healing time, and complications were analyzed and compared between the two groups. The average defect size was 30 cm2 in type I KPIF and 36.6 cm2 in bKPIF, and an average flap size of 86.5 cm2 was covered in type I KPIF, larger than bKPIF at 73.8 cm2. The flap/defect ratio was significantly lower in the bKPIF group (p < 0.02), with an average of only 55% pedicular area. The average advancement distance in the bKPIF group was 1.85 cm (standard deviation 0.78) greater than that in the type 1 KPIF group. There was no significant difference between the groups in terms of operation time, complete healing time, and complications. All ten bKPIFs were successful without any flap necrosis. Even though the mean pedicular area in the bKPIF group was nearly half compared with that in the type I KPIF group, it was sufficient to perfuse the entire flap without any major complications. This novel technique using bKPIF has potential clinical relevance, as evidenced by the enhanced ability to cover chronic defects with severe scarring. Lateralizing the hotspots to the bilateral corners of the flap is the mechanism that facilitates this potential.

Evaluation of the predictive value of the body-mass-index choosing perforator flaps from different donor sites

BACKGROUND

Free flap design must fulfill different criteria to ensure functional and aesthetic reconstruction of different types of defects in different body areas. A four-dimensional planning concept was used including flap length, width, thickness and tissue composition. This study evaluates if body-mass-index (BMI) has a predictive value for flap design.

METHODS

A prospective study including hospitalized patients in the Department of Plastic, Aesthetic, Hand and Reconstructive Surgery was conducted. Not taking into account the reason for admission, the patients were examined based on age, weight, height, BMI and sex. The areas of a potential harvest of free fasciocutaneous and perforator flaps were measured using ultrasound examination to determine the thickness of the subcutaneous layers and prove blood perfusion.

RESULTS

Over the period of four months, a total of 101 patients (36 females and 65 males) were included in this study and gave written consent. No statistical significance regarding the demographic data such as age, sex and BMI could be identified. An average to high correlation between free flap thickness and BMI was shown for the thoracodorsal artery perforator (TDAP), anterior lateral thigh (ALT) and deep inferior epigastric perforator (DIEP) flap in both, male and female patients. Free flaps of distal body parts such as the interosseous posterior flap, showed a lower correlation. No correlation using the Pearson coefficient could be found for age and volume.

CONCLUSION

Our study demonstrated that the BMI is a predictive indicator that can be used in the preoperative planning of reconstructions using free flaps. Depending on the defect location, the BMI can be considered to predict the thickness of the free flap and may influence the surgeon's choice. On the other hand, a lower correlation between BMI and flap thickness encourages the use of standard flaps if more volume is desired, as the DIEP flap might be sufficient even in normal-weight women. Flaps of distal body parts, such as the forearm or lower leg, are not prone to such predictions and require other selection criteria.

Planes for Perforator/Skin Flap Elevation-Definition, Classification, and Techniques

BACKGROUND

 Elevation in different layers achieving thin flaps are becoming relatively common practice for perforator flaps. Although postreconstruction debulking achieves pleasing aesthetic results and is widely practiced, customized approach during elevation to achieve the ideal thickness will increase efficiency while achieving the best possible aesthetic outcome. Multiple planes for elevation have been reported along with different techniques but it is quite confusing and may lack correspondence to the innate anatomy of the skin and subcutaneous tissue.

METHODS

 This article reviews the different planes of elevation and aims to clarify the definition and classification in accordance to anatomy and present the pros and cons of elevation based on the different layers and provide technical tips for elevation.

RESULTS

 Five different planes of elevation for perforator flaps are identified: subfascial, suprafacial, superthin, ultrathin, and subdermal (pure skin) layers based on experience, literature, and anatomy.

CONCLUSION

 These planes all have their unique properties and challenges. Understanding the benefits and limits along with the technical aspect will allow the surgeon to better apply the perforator flaps.

Attributes of a Good Microsurgeon-A Brief Counsel to the Up-and-Coming Prospects

Microsurgery, which deservedly sits on top of the reconstruction ladder, has been a boon to plastic surgery. It is because of this marvelous tool that plastic surgeons the world over have been able to tackle many reconstructive dilemmas, which were once considered to be an improbability. Microsurgery-aided revolutions have rendered a new meaning to all forms of reconstruction-whether it is postoncological, posttraumatic, or postlymphedema reconstruction. As the most advanced reconstructive medium at our disposal that has broadened the horizons of plastic surgery exponentially, it is but obvious that many budding plastic surgeons are drawn toward this subspecialty. In lieu of the aforementioned facts, it is necessary to sensitize all such aspiring surgeons about the various intricacies concerning the field of microsurgery. This article with its focus on the six desirable microsurgical attributes of "Clarity, Curiosity, Perseverance, Passion, An Open Mindset and Action," is meant to be a modest attempt on part of the authors to share their microsurgical insights, procured through their respective journeys, with budding aspirants, hoping to sensitize as well as motivate them for the challenging path that lies ahead.

Comparison of outcomes between single- and multiple-perforator-based free perforator flaps: A systematic review and meta-analysis

BACKGROUND

Perforator-based free perforator flaps have become an important tool for the reconstruction of tissue defects. The effect of the number of perforators on the outcomes of perforator flaps has been widely debated. This study aimed to compare the outcomes of single- and multiple-perforator-based free perforator flaps in free-flap reconstruction.

METHODS

We searched PubMed, Web of Science, EMBASE, Chinese BioMedical Literature Database (CBM), Cochrane Library, and clinicaltrials.gov between January 2000 and June 2021 to identify studies that reported data on the outcomes of free perforator flaps. Two authors individually extracted data and performed quality assessment. Outcomes, including partial flap loss, total loss, fat necrosis, arterial insufficiency, venous insufficiency, hemorrhage and hematoma, wound dehiscence at recipient sites and donor site complications, were evaluated.

RESULTS

Thirty-two studies with 2498 flaps were included in our analysis. No significant difference was found in the rates of partial loss and arterial insufficiency of flaps, hemorrhage and hematoma, wound dehiscence at recipient sites and donor site complications. However, the multiple-perforator group showed significantly lower rates of total loss (relative risk [RR] = 1.08, 95% confidence interval [CI]: 0.78-1.79, p = .754), fat necrosis (RR = 1.79, 95% [CI]: 1.36-2.36, p = .000) and venous insufficiency (RR = 1.72, 95% CI: 1.07-2.79, p = .026) than the single-perforator group.

CONCLUSION

The rates of total loss, fat necrosis and venous insufficiency in the multiple-perforator group were lower than those in the single-perforator group. Hence, we recommend that multiple perforators be included in the free perforator flap when appropriate, to yield better clinical outcomes in reconstruction.

Cutaneous perforators of the arm and anatomical landmarks for defining the flap donor sites

PURPOSE

There are few studies searching for possible perforator flap donor sites on the arm. This study aimed to identify the locations of cutaneous perforators of the arm according to anatomical landmarks.

METHODS

Thirteen Thiel-fixed and latex-filled upper extremities of bodies donated to science were used. The distance between the acromion and medial or lateral epicondyle of the humerus was defined as the Y-axis, and the axis that cut the Y-axis perpendicularly through the epicondyles of the humerus was identified as the X-axis. The Y-axis was then divided into three parts Cutaneous arterial perforators were found using surgical dissection. The locations of the perforators were determined according to the defined lines and regions.

RESULTS

On the lateral side, there were 6.00 ± 2.08 perforators per arm, of which 56.4% were septocutaneous and 43.6% muscular. In all extremities, with in the distal 1/3 of the lateral arm, there were 1-4 radial collateral artery-based perforators. The mean distance of these perforators to the Y-axis was 1.16 ± 0.53 cm. On the medial side, there were 5.05 ± 1.44 perforators per arm, which were all septocutaneous perforators. In 85% of the extremities, within the middle 1/3 of the medial arms, there were 1-2 superior ulnar collateral artery-based perforators. The mean distance of these perforators to the Y-axis was 1.53 ± 0.61 cm.

CONCLUSION

There are always perforators from the radial collateral artery with in the distal third of the lateral arm. Within the middle third of the medial arm, it is usually possible to find a perforator from the superior ulnar collateral artery.

Application of the Jigsaw Puzzle Flap Based on Freestyle Perforators to Repair Large and Deep Ulcers on the Buttocks

Background

Decubitus ulcers are common skin injuries in plastic and burn surgery departments, usually occur in patients with a long disease course and poor underlying health. Designing a reconstruction procedure with safety blood supply to a large volume soft tissue and resulting in minimal trauma is a priority for surgeons.

Methods

The free-style perforators on the potential donor sites surrounding the ulcers were detected by Doppler, and the area of the ulcer was divided into several sections based on the location of pre-design perforator flaps. According to the insertion point of the perforators, small V-Y advancement flaps, propeller flaps and rotation flaps pedicled with freestyle perforators were formed and moderately modified during surgery. All of the small flaps were transplanted from donor sites to the defect and reassembled into a new composite flap to repair the ulcer. The donor sites were directly closed. The area of the flaps ranged from 7.0 × 10.5 cm to 8.0 × 22.0 cm and the diameter of the pedicle perforators ranged from 0.5 to 4.0 mm.

Results

In 30 patients, 65 flaps were constructed, and all of the flaps survived with direct closure of all donor sites. One case with effusion healed 1 month postoperatively through draining and application of a mild pressure dressing. After a 3–24 months follow-up period, all of the patients were satisfied with post-operative function and appearance, and only one case had a local recurrence 6 months postoperatively.

Conclusion

The jigsaw puzzle flap based on freestyle perforators can repair the large skin and soft tissue defects caused by decubitus ulcers on the buttocks, with direct donor flap area closure. This method is easy to perform with a safe blood supply and minimal trauma resulting from the avoidance of microvascular anastomosis and the conventional myocutaneous flap.

Propeller Flaps in Lower Extremity Reconstruction

Propeller flaps represent an outstanding alternative to conventional pedicled and free flap options in lower extremity reconstruction, offering significant advantages over the latter. An understanding of the perforasome concept, hot and cold perforator locations, and basic flap design enable the surgeon to readily harvest flaps based on any clinically relevant perforator in freestyle fashion. The purpose of this article is to review fundamentals of propeller flap design and harvest in the lower extremity and discuss reconstructive strategies by level of injury.

A Propeller Perforator Flap in the Distal Lower Extremity: An Alternative to Free Flap Coverage Near the Ankle

As perfusion assessment technologies and microsurgical techniques have evolved, plastic surgeons have become increasingly aggressive and creative in offering reconstructive solutions to limb salvage problems. In the distal lower extremity, pedicled perforator flap transfer has grown in popularity as compared to the historically reliable option of free tissue transfer. Pedicled perforator flaps typically avoid muscle harvest and restore the thin, supple soft tissue in the distal extremity, where there is a relative lack of redundancy of soft tissues. They also allow for a shorter operative time and recovery in otherwise complex wounds of the foot and ankle. This case report highlights the indications, nuance, and post-operative course of a patient who underwent peroneal perforator flap for coverage of a complex ankle wound in the setting of a calcaneal fracture.

Reconstruction of traumatic and non-traumatic lower extremity defects with local or free flaps

Background

Despite continuous surgical advances, reconstruction of complex lower extremity wounds remains challenging. The indication of local flaps or microsurgical free tissue transfer depends on the anatomical location and size of the defect, as well as the comorbidities and general condition of the patient. In this study, local and free flap reconstruction of distal lower extremity defects was assessed, and postoperative complications and limb salvage were analyzed.

Methods

A total of 34 patients were included in this retrospective study. Distal lower extremity defects were of traumatic (29%) and non-traumatic (71%) etiologies. Patient characteristics, flap selection, postoperative complications, and limb preservation within the first 12 months were assessed and compared by reconstructive treatment concept. Statistical analysis included parametric and non-parametric tests. The two-sided alpha was set at 5% for all statistical tests.

Results

While 21 patients were treated with local flaps, 13 patients underwent microsurgical free flap reconstruction. The most common comorbidities were peripheral vascular disease and diabetes. Local flaps included the gastrocnemius muscle flap, soleus flap, sural flap, and plantaris medialis flap. The most commonly used free flaps for soft tissue reconstruction were latissimus dorsi and gracilis muscle flaps. The overall lower extremity preservation rate was 94.1%. There was one case of below-knee amputation 1 month after free flap reconstruction, and one case of first-ray amputation of the foot after local flap coverage.

Conclusion

Reconstruction of lower extremity defects can be achieved by local or free flap reconstruction. Flap selection is influenced by anatomical location, defect size, and patient factors.

The profunda artery perforator free flap for lower extremity reconstruction

BACKGROUND

The profunda artery perforator (PAP) flap has been reported in several types of reconstructions. This report aims to evaluate the usefulness and the clinical outcome of patients who underwent the PAP free flap for lower limb reconstruction.

METHODS

Between February 2018 and February 2020, nine patients with injury at lower third of the leg, foot dorsum or foot plant (eight acute injuries and one chronic ulcer) were selected. Mean wound size was 12.5 × 6.3 cm (9 × 5-14.5 × 6.5). Inclusion criteria consisted in patient's request to hide the donor site scar and the absence of previous traumas or surgery in the donor site. Patients considered unable to bear prolonged surgery were excluded. Patients underwent preoperative CT angiography and peri-operative Doopler, for perforator selection. All flaps were designed with pinch test, in elliptical shape. Microvascular anastomosis was performed to the tibialis anterior/posterior or medial plantar vessels. Outcomes were evaluated in terms of wound coverage success and patient's quality of life through Lower Extremity Functional Scale (LEFS) questionnaire.

RESULTS

The mean size of the harvested skin paddle was 13.5 × 7.4 cm (9 × 6-15 × 8) and mean pedicle length was 8.5 cm. Mean flap harvest time was 43.5 min (35-55). Flap survival rate was 100%, with one re-exploration with minimal partial flap loss. Mean follow-up was 13.5 months . Reconstructive results were successful in wound coverage and function. All patients reported satisfaction with their result by LEFS questionnaire (score:64.7).

CONCLUSION

With proper patient selection, there was 100% flap survival rate with no major complication. According to our data, the PAP free flap could be a valuable option for lower extremity reconstruction.

Wide posterior gluteal-thigh propeller flap for reconstruction of perineal defects

INTRODUCTION

With increasing popularity of minimally invasive approaches to abdominoperineal resection (APR), thigh-based flaps are becoming the preferred option for reconstruction. The gluteal-thigh flap provides sufficient bulk, albeit with a high complication rate. We reevaluated the vascularization and design of the gluteal-thigh flap. The purpose of this study is to highlight the importance of the vascularization of the posterior thigh skin by the descending branch of the inferior gluteal artery (IGA) and the profunda femoris artery (PFA) perforators to design a more reliable and versatile gluteal thigh flap. This flap is indicated in selected cases in which use of vertical rectus abdominis musculocutaneous flap is not feasible.

METHODS

Eleven fresh cadavers were used. The course, distribution, and diameter of IGA and PFA perforators were recorded. A wide posterior gluteal-thigh propeller flap (WPGTPF) was designed including the distance between the ischiatic tuberosity and greater trochanter; and extending it to within 8 cm of the popliteal fossa to improve flap reliability. Ten patients (mean age of 58.7 ± 10.6 years) underwent APR due to anal cancer (2) and rectal cancer (8); the approach was open in 3, laparoscopic in 6, and robotic in 1. All 10 patients received unilateral flap with a width of 12 ± 3.3 cm and surface of 405.5 ± 175.9 cm² .

RESULTS

The descending branch of the IGA was dominant in 72.7% of the specimens. In 22.7% of the specimens, the pedicle of the flap derived from the first or second PFA perforators. In one case, there was a double vascularization. Descending branch of the IGA was mapped at 46 ± 7.96 mm on the X-axis (horizontal line from the ischial tuberosity [IT] to the greater trochanter) and -12.1 ± 17.9 mm on the Y-axis (vertical line from the IT to the Medial Femoral condyle). Its average caliber measured 2.18 ± 0.3 mm. The first and second PFA perforators were located at 101.6 ± 17.9 mm and 104.5 ± 15.5 mm on the X-axis; 35.9 ± 27.1 mm and 89.2 ± 37.6 mm on the Y-axis. Their average diameters were 1.84 ± 0.41 mm and 1.48 ± 0.3 mm. In two cases, the flap was based on the first PFA perforator, the rest were on the descending branch of the IGA. Neither complete nor partial flap necrosis was observed. One patient developed coccyx osteomyelitis treated and resolved with bone debridement and one patient developed a seroma of the lateral thigh that was treated conservatively. Three patients underwent a debulking procedure by a combination of liposuction and resection to improve the gluteal symmetry. All ten flaps survived completely.

CONCLUSIONS

Harvest of a wide flap that includes the PFA perforators and implementation of the propeller design increase the survival and versatility of the flap.

In Pursuit of the "Perforator" in the Perforator Skin Flap

Another congress of the World Society for Reconstructive Microsurgery (WSRM) this past year in Bologna was magnificent not just for the presentation of so many keynote lectures by the giants of our field nor the novel and innovative ideas shown by those who will someday follow in those footsteps, but by making all of us realize how many capable microsurgeons there are now practically everywhere in this world, doing incredibly important surgical management of challenges that previously were unmet and resulted in sheer devastation for so many of our patients. How much we are the same in our goals, aspirations, and abilities could not be overlooked, but it is amazing how much we also want to learn more together-each relying on the other. To do so, we must not forget our origins as we appropriately plan for the future. All this we philosophized in our WSRM panel on lower extremity reconstruction, while emphasizing on the surface the perforator flap that at the least today has caught everyone's attention. In this overview to follow, we once again tell two stories, starting with the beginnings of the concept of flaps in showing how the nomenclature has evolved over time according to our various surgical manipulations. Often overlooked, though, is a parallel timeline by the anatomists who have better elucidated the circulation to these flaps, where it will become obvious that often long ago the existence of perforators was recognized by them long before known by the surgeons. At least today, these two paths have at least temporarily intersected. Our pursuit of the "perforator" in the perforator skin flap has come full circle, following the course of the history of the flap itself-a pursuit of excellence.

Correction of Temporal Hollowing With the Superior Gluteal Artery Perforator Free Flap

ABSTRACT

Temporal hollowing is most frequently an acquired deformity and can be caused by volume defects of bone, soft tissue, or both. Recently, surgical reconstruction with autogenous fat or allografts has been introduced, but these materials can be resorbed over time and may also lead to infection. Herein, the authors present 2 cases demonstrating the treatment of temporal hollowing with a superior gluteal artery perforator (SGAP) free flap. Both patients had a history of traffic accidents and subsequent craniectomy because of subdural hemorrhage, followed by cranioplasty. An SGAP free flap was selected to reconstruct the soft tissue temporal defect in both patients. Pre-operatively, computed tomography (CT) angiography was used to locate the superior temporal artery (STA). A preauricular incision provided surgical access to the STA, and a subcutaneous pocket was created. The STA and SGAP artery and vein anastomoses were performed. Before flap insetting, it was de-epithelized, and its volume and shape trimmed to fit into the temporal defect. The patients' post-operative courses were without complications, and facial symmetry was achieved. This is the first case report describing the microvascular reconstruction of temporal hollowing with an SGAP free flap. The SGAP free flap is permanent and highly vascularized with no risk of infection. These case reports illustrate a unique reconstruction technique that resulted in a satisfactory outcome for the patients.

Arm reconstruction

The arm is less often concerned by reconstructive surgeries than more distal parts of the upper extremity. However, when affected, the arm is frequently part of complex mutilating injuries involving composite defects. For a given traumatic or oncologic defect, there are several reconstructive options and choosing the right sequence may pose a challenge even to the most experienced surgeon. The latter must integrate not only functional and esthetic requirements, but also the surgeon's habits, especially in situations of emergency. Once life-threatening conditions are averted, wound debridement, bony stabilization, neurovascular, and cutaneous reconstruction tailored to the defects should be performed in a single-stage procedure. Functionally, prompt bony stabilization is necessary to allow early mobilization. Diaphyseal shortening of the humerus can be a salvage procedure to avoid nerve and vascular grafting, with good biomechanical tolerance up to 5cm. Restoration of adequate elbow motion sometimes requires muscle transfer and should be a main concern, as proper positioning of the hand during daily activities demands a functional elbow joint. Esthetically, the surgeon must choose the most cosmetic skin coverage option whilst limiting morbidity of the donor site area. The flaps vascularized by the sub- scapular or thoraco-dorsal vessels are the most useful flaps for arm reconstruction. This paper discusses the reconstructive sequence of complex defects of the arm and provides a review of commonly used reconstructive techniques supported with illustrative cases.

Planned combined onco-plastic (COP) surgical approach improves oncologic outcomes in soft tissue sarcomas

BACKGROUND

Combined modality of radiotherapy and surgery is the standard of treatment of soft tissue sarcomas (STS). The goal of this study was to assess whether a Combined Onco-Plastic (COP) surgical approach in the setting of neo-adjuvant radiotherapy can improve the oncologic outcomes of STS and reduce the rate of wound complications.

METHODS

We performed a retrospective review of all patients with STS treated at a single sarcoma centre (St Vincent's Hospital, Melbourne) between 2007 and 2018. Patients were stratified into two groups based on whether they have received the COP approach or were closed primarily by the orthopaedic surgeon. We analysed oncological outcomes and rate of wound complications.

RESULTS

A total of 546 patients with comparable demographics and tumor characteristics were included. The COP approach was performed in 75.6% of the patients. Wide margins were obtained in 97.4% of the cases, and this was significantly higher in the COP group (p < 0.001). The cumulative rate of local recurrence was 4.9%, with a 52% risk reduction in the COP approach, although this reduction was not significant (HR = 0.48; 95% CI 0.21-1.06; p = 0.070). The COP approach had better disease free survival (DFS) (aHR 1.86, 95% CI 1.45-2.37; p < 0.001) and Overall survival (risk of death aHR 0.49; 95% CI 0.30-0.79; p = 0.004). The overall wound complication rate was 18.6% with no difference between the two groups.

CONCLUSION

A planned collaboration between the orthopaedic oncologist and the plastic surgeon is beneficial in the treatment of STS after neo-adjuvant radiotherapy, allowing remarkably good oncological outcomes and a low rate of wound complications.

Identification of Ulnar Artery Perforators Using Color Doppler Ultrasonography

BACKGROUND

 The ulnar artery perforator (UAP) flap, which is hairless, thin, and pliable, has been used for the reconstruction of soft tissues from the finger to the elbow. Preoperative planning is essential for a perforator flap surgery, and there are some tests to identify perforators. Color Doppler ultrasonography (US) with a high-frequency transducer helps in detecting decreased flow in smaller vessels, such as perforators. The purpose of this study was to determine the anatomical locations and origins of perforators arising from the ulnar artery using color Doppler US in healthy volunteers.

METHODS

 Forty forearms of 20 healthy volunteers were included in the study. Perforators arising from the ulnar artery, within 100 mm proximal to the pisiform, were investigated using color Doppler US with a high-frequency transducer.

RESULTS

 A total of 205 perforators were identified. On comparing the locations in each 20 mm section from the pisiform, the largest number of perforators was 58 (28%), within 20 mm proximal to the pisiform. The axial view demonstrated 44 (21%), 64 (31%), 32 (16%), and 65 (32%) perforators in the radial, ulnar, superficial, and deep aspects of the ulnar artery, respectively. Fifty-two and 28 essential perforators were supplied by the UAPs arising from the superficial and ulnar aspect within 20 mm proximal to the pisiform and between 21 and 40 mm proximal to the pisiform, respectively, while elevating the UAP flap.

CONCLUSION

 This is the first study to assess the UAP using color Doppler US. Identification of UAP using color Doppler US can be used as a preoperative assessment for reliable elevation of a UAP flap.

Free perforator flaps vs propeller flaps in lower limb reconstruction: A cost/effectiveness analysis on a series of 179 cases

PURPOSE

The aim of this report is to compare free perforator flaps and propeller flaps in the coverage of lower limb soft tissue defects.

PATIENTS AND METHODS

179 patients (age between 5 and 92 years old), underwent soft tissue reconstruction of the lower limb between January 2009 and January 2015, either by free flap or propeller flap. The two groups were retrospectively evaluated in order to assess the outcome, complications and potential risk factors. Correlations between risk factors and presence/absence of failure or complications have been evaluated with descriptive statistical analysis and a set of logistic regression models. Finally, an economic analysis was conducted to evaluate the different tecniques.

RESULTS

In a simple descriptive statistical analysis, the overall failure rate is 6% for free flaps and 3.7% for propeller flaps; the complication rates are 14% vs 21.5% and it increases as dimension increases. The logistic models relating failure and complications with potential risk factors do not show significant differences, whereas the economic analysis show that the average expense of free flaps is 5077.5€ per patient, 1595.6€ per patient for propeller flaps.

CONCLUSIONS

Our results do not demonstrate significant differences between the two groups about correlation of risk factors or flap size with complication or failure. The surgical option choice should be taken only after accurate evaluation of the soft tissue surrounding the defect. Propeller flaps should be preferred in case of small/medium size defects in otherwise healthy extremities. Free perforator flaps should be the choice in large defects due to trauma or vascular diseases. The economic analysis suggests that propeller flap should be considered when possible.

[Application of free-style perforator flap for soft tissue defect of knee]

OBJECTIVE

To investigate the effectiveness of free-style perforator flap in repairing the soft tissue defect of knee.

METHODS

Between December 2011 and October 2017, 13 patients with the soft tissue defects of knees were repaired with the free-style perforator flaps. There were 9 males and 4 females, with an average age of 40 years (range, 14-65 years). The injuries were caused by traffic accident in 7 cases, crushing in 4 cases, and falling from height in 2 cases. The soft tissue defects in 9 cases formed after 2 weeks-2 months (mean, 1 month) of lower extremity fractures fixation. The other 4 cases were urgently admitted to the hospital after injury, and the time from injury to admission was 0.5-18.0 hours (mean, 8 hours). The size of soft tissue defect ranged from 3 cm×2 cm to 12 cm×8 cm after debridement. Nine propeller flaps, 6 rotating flaps, and 2 V-Y advanced flaps were used; and 9 cases were repaired by single flap and 4 cases were repaired by combined flaps. The size of flap ranged from 7.5 cm×2.5 cm to 20.0 cm×6.0 cm. The donor sites were sutured directly.

RESULTS

The flaps survived smoothly and incisions healed by first intention in 12 cases. The congestion occurred in 1 case, which obtained delayed healing after symptomatic treatment. All incisions at donor sites healed by first intention. All patients were followed up 3-24 months with an average of 6 months. The shape and motions of knee were satisfactory.

CONCLUSION

The free-style perforator flap can maximize the utilization of the donor area around the knee wound, with reliable blood supply, small trauma, and easy operation. It is an ideal flap for the soft tissue defect of knee.

Biofabrication of thick vascularized neo-pedicle flaps for reconstructive surgery

Wound chronicity due to intrinsic and extrinsic factors perturbs adequate lesion closure and reestablishment of the protective skin barrier. Immediate and proper care of chronic wounds is necessary for a swift recovery and a reduction of patient vulnerability to infection. Advanced therapies supplemented with standard wound care procedures have been clinically implemented to restore aberrant tissue; however, these treatments are ineffective if local vasculature is too compromised to support minimally-invasive strategies. Autologous "flaps", which are tissues equipped with their own hierarchical vascular supply, can be harvested from one region of the patient and transplanted to the wound where it is reperfused upon microsurgical anastomosis to appropriate recipient vessels. Despite the success of autologous flap transfer, these procedures are extremely invasive, incur obligatory donor-site morbidity, and require sufficient donor-tissue availability, microsurgical expertise, and specialized equipment. 3D-bioprinting modalities, such as extrusion-based bioprinting, can be used to address the clinical constraints of autologous flap transfer, primarily addressing donor-site morbidity and tissue availability. This advancement in regenerative medicine allows the biofabrication of heterogeneous tissue structures with high shape fidelity and spatial resolution to generate biomimetic constructs with the anatomically-precise geometries of native tissue to ensure tissue-specific function. Yet, meaningful progress toward this clinical application has been limited by the lack of vascularization required to meet the nutrient and oxygen demands of clinically relevant tissue volumes. Thus, various criteria for the fabrication of functional tissues with hierarchical, patent vasculature must be considered when implementing 3D-bioprinting technologies for deep, chronic wounds.

The Application of a Jigsaw Puzzle Flap Based on a Freestyle Perforator and an Aesthetic Unit for Large Facial Defects

BACKGROUND

The single-stage reconstruction of large facial defects remains a conundrum due to the balance between function and aesthetics after skin cancer radical resection.

OBJECTIVE

The goal of this study was to explore a novel surgical procedure for large facial defects that not only resurfaces the large defect in single stage but also improves aesthetic outcomes for both defects and donor sites.

METHODS

The reconstructions were performed using local flaps in the form of a "jigsaw puzzle" flap based on a freestyle perforator and facial aesthetic unit. This procedure starts with a Doppler signal of the perforator and proceeds sequentially in conjunction with adjacent flaps, similar to fitting puzzle pieces, to create a new, large, jigsaw puzzle-like flap that complies with the concept of a facial aesthetic unit. All defects achieved tensionless primary closure with suturing in a concealed area.

RESULTS

Procedures were performed for 40 patients; the average size of the defects was 37 cm (range, 6-51 cm). The patients were followed up for a range of 6 months to 2 years, and reconstruction without flap loss was 100% successful.

CONCLUSION

Via a jigsaw puzzle flap based on a freestyle perforator and an aesthetic unit, we can take advantage of a greater freedom of flap selection and have a more versatile aesthetic design. The jigsaw puzzle flap concept represents a safe and favorable approach to the reconstruction of large facial defects.

Flap warming improves intraoperative indocyanine green angiography (ICGA) assessment of perfusion. An experimental study

BACKGROUND

Indocyanine green angiography (ICGA) is slowly replacing conventional methods of evaluating perfusion during flap surgery. Microcirculatory changes during flap elevation create a marked state of hypoperfusion intraoperatively leading to ICGA underestimation of tissue viability and consequent resection of viable tissue. We propose a novel method of flap warming to induce maximum vasodilation before performing ICGA to increase accuracy in assessing perfusion.

METHODS

Submental flaps harvested on a single perforator were created in 8 pigs. ICG angiography was performed in the intraoperative phase (ICGA-C), after inducing maximum vasodilatation by warming the flap at 42 °C (ICGA-W) and at 24H postoperative (ICGA-24). By setting a fluorescence threshold of 33% as indicative of necrosis, the flap surface deemed viable by ICGA was measured for ICGAC, ICGAW and ICGA24. The results were then compared to the actual flap survival observed clinically at 7 days.

RESULTS

The mean of ICG-C predicted flap survival (FS-C = 49.17%) is 12.97% lower than the mean of actual flap survival on postoperative day 7 (FS = 62.14%). The mean difference between ICG-W and ICG-24 predicted flap survival (FS-W and FS-24) and actual flap survival in the postoperative day 7 (FS) is lower, 3.13% and 2.15%, respectively. Average perfusion recovery over 24 h was 10.83% (FS-24-FS-C).

CONCLUSIONS

Conventional intraoperative ICGA underestimated perfusion in all cases. Warming the flap intraoperatively and achieving maximum vasodilation mitigates the effects of vasoconstriction and mimics the microcirculatory environment encountered at 24 h. Performing angiography after induced vasodilation improves ICGA assessment of flap perfusion.

Perineal Reconstruction with a Diamond-shaped Perforator Flap: A Case Report

Reconstruction of perineal defects is a challenging procedure. Various surgical techniques have been proposed. Compared with traditional myocutaneous flaps, pedicled perforator flaps are believed to be a less invasive option for perineal reconstruction, with better functional and cosmetic results. We present the case of a 47-year-old woman with a perianal Paget's disease who underwent surgical excision of the lesion. The reconstructive technique was a pedicled flap based on an internal pudendal skin perforator artery. The flap was designed in a diamond-shaped pattern. Six months after the operation, the patient is disease-free with successful aesthetic and functional results. A polygonal diamond-shaped flap is an easy and reliable choice for perineal reconstruction, offering better adjustment in the perianal region and avoidance of the curvilinear perianal incision (which often leads to anal stenosis).

The Value of Multidetector Row Computed Tomography Angiography for Preoperative Planning of Freestyle Pedicled Perforator Flaps

BACKGROUND

Because the course and territory of perforators are different in each region, careful preoperative planning to identify the proper perforators can be critical to ensure a successful dissection of a freestyle pedicled perforator flap. In this study, our first experience for preoperative perforator mapping of a freestyle pedicled perforator flap using multidetector row computed tomography (MD-CT) angiography is presented.

METHODS

Twelve patients were planned to undergo various soft-tissue reconstructions with freestyle pedicled perforator flaps. They were evaluated with preoperative MD-CT angiography. The OsiriX for mac software was used to process the data obtained from MD-CT angiography. The available images from MD-CT angiography were analyzed to determine where the proper perforators were located for preoperative planning of a freestyle pedicled perforator flap. Through the MD-CT angiography, the optimal perforators were mapped and a reliable flap design could be made so that the flap was elevated more safely and perfectly to cover an adjacent soft-tissue defect.

RESULTS

In all 12 patients, each flap was elevated successfully based on the perforators mapped preoperatively with MD-CT angiography. A total of 27 perforators (1-3 perforators per flap) were identified by MD-CT angiography in 12 patients and later confirmed during the flap dissection (sensitivity, 100%).

CONCLUSIONS

The MD-CT angiography can be a new but very effective imaging modality for preoperative planning of a freestyle pedicled perforator flap surgery. It allows surgeons to accurately select the most appropriate perforators with the shortest intramuscular or suprafascial course preoperatively leading to safer and easier flap dissection.

Keystone and Pedicle Perforator Flaps in Reconstructive Surgery: New Modifications and Applications

Pedicle perforator flaps and keystone perforator island flaps are additional tools for reconstructive surgeons. Advances in understanding of vascular anatomy, the dynamic nature of perforator perfusion, inter-perforator flow and the hot-spot principle have led to reconstructive techniques that allow innovative autologous tissue transfer while limiting donor site morbidity. Further modifications of the pedicle perforator flap have led to a multitude of freestyle pedicle perforator flap options, as well as freestyle free flaps for soft tissue reconstruction. Modifications in the keystone perforator island flap have increased the degrees of freedom for soft tissue coverage of large defects, with reliable and aesthetically pleasing results.

Evolving Concepts of Keystone Perforator Island Flaps (KPIF): Principles of Perforator Anatomy, Design Modifications, and Extended Clinical Applications

BACKGROUND

Keystone flaps have demonstrated growing clinical applications in reconstructive surgery in the past decade. This article highlights flap modifications and their versatility for clinical applications and management of complex defects.

METHODS

A retrospective chart review was conducted of consecutive patients undergoing keystone flap reconstruction at the authors' institution from January of 2012 to December of 2014. Patient demographics, indications, and operative and postoperative details were abstracted.

RESULTS

Forty-two keystone flaps were performed in 36 patients. Indications included malignant melanoma (n = 14), soft-tissue sarcoma (n = 12), benign pathologic conditions (e.g., exposed hardware, enterocutaneous fistula, tissue necrosis) (n = 6), and nonmelanoma skin cancer (n = 4). Twenty-eight percent received neoadjuvant irradiation, and 70 percent of these were for sarcoma. Locoregional adjunct flaps were performed in eight patients. The deep fascia was nearly completely in a circumferential manner in 18 of 36 patients (50 percent), in 92 percent of the sarcoma reconstructions, and located mainly in the lower extremity. Average defect size was 215 cm (range, 4 to 1000 cm). Average defect size was 474 cm and 35.8 cm after sarcoma and malignant melanoma resection, respectively. Average flap size was 344 cm (range, 5 to 1350 cm). Ninety percent of cases had flap sizes exceeding the traditional 1:1 ratio. There was no flap loss or partial necrosis. Mean time to mobilization was 1.8 days, and mean hospital length of stay was 6.8 days.

CONCLUSIONS

Keystone flaps offer an excellent versatile tool for reconstructive surgeons. Fundamental principles behind the vascular basis of the keystone flap and its modifications permit their greater utility in complex wounds in the settings of large oncologic resections, irradiation, and trauma.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.