Consideration of a thin flap as an entity and clinical applications of the thin anterolateral thigh flap

Anterolateral thigh flap

The anterolateral thigh (ALT) flap is a versatile soft tissue flap. It can be harvested as a fasciocutaneous or myocutaneous flap. Vascularized fascia can be included or the pedicle may be harvested as a flow-through flap. The flap can also be harvested incorporating multiple skin islands or as a chimeric flap incorporating separate skin and muscle components. When a large flap is needed, the entire lateral thigh can be harvested by combining the ALT with either the tensor fascia lata or the anteromedial thigh flap as a conjoined flap. Morbidity is remarkably minimal despite the availability of such generous amounts of tissue. The purported difficulty with the use of this flap is because of the anatomical variations that may render this flap unreliable. This paper clarifies the vascular anatomy of the flap and elaborates an approach to flap harvest that can be used to reliably harvest the flap in spite of the anomalies that may be encountered.

Comparison of free anterolateral thigh flaps and free muscle-musculocutaneous flaps in soft tissue reconstruction of lower extremity

BACKGROUND

The objective of this study was to compare the free muscle-musculocutaneous flaps and free perforator skin flaps used for soft tissue reconstruction of the lower extremities.

METHODS

Fifty-three patients whose skin and soft tissue of the lower extremities had been reconstructed were divided into two groups: a perforator flap group, reconstructed using anterolateral thigh (ALT) free flap (23 cases), and a muscle-musculocutaneous flap group, in whom latissimus dorsi and rectus abdominus muscle-musculocutaneous free flaps were used (30 cases). Postoperative complications, long-term results, and donor site morbidities were studied in the two groups.

RESULTS

Complete flap survival was 78.3% with four total and one partial flap loss in the ALT group and 90.0% with one total and two partial failure in the muscle-musculocutaneous flap group. Muscle-musculocutaneous flaps were the flaps of choice in Gustillo grade IIIB-C injuries and for reconstruction of more proximal localizations. ALT was preferred in relatively younger patients and was typically used for coverage of the distally localized defects. Flap complication rate was significantly higher in the ALT group, but the overall complication rate was similar between the groups.

CONCLUSION

ALT perforator flap is a precious option for lower extremity soft tissue reconstruction with minimal donor site morbidity. Nevertheless, the beginners should be attentive to an increased rate of flap complications with the ALT flap and free axial muscle-musculocutaneous flaps would still be the tissue of choice for coverage of leg defects for a surgeon before gaining enough experience with perforator flap dissection.

Pedicle anterolateral thigh flap reconstruction after pelvic tumor resection: a case report

A 47-year-old female with a locally advanced urologic malignancy previously managed with resection, diversion, and postoperative radiation therapy presented for management of her recurrent cancer that had eroded through the soft tissues of the left inner thigh and vulva. On all staging studies the tumor involved the left common femoral artery, and vein, both above and below the inguinal ligament. The difficulty with such tumors is the availability of tissue to reconstruct the defect. The patient had a history of deep venous thrombosis in the femoral venous system. A local flap was the most logical type of reconstruction. The patient had a right lower quadrant ureterostomy with a large parastomal hernia which further limited the local flap options. An anterolateral thigh flap from the opposite thigh was used to reconstruct the soft tissue deficit in this patient. This resurfaced the defect and provided coverage for the vascular reconstruction.

An anterior-lateral thigh perforator flap on a recipient brachial-radial vein graft for complex wound reconstruction: a case report

A case of challenging microsurgical reconstruction of a difficult defect in a radiated upper limb is reported. A difficult wound, with tendon and bone exposition, developed on the dorsum of the forearm in a 76-year-old patient; she had been radiated since almost 50 years and her left hand had also been revascularized twice with venous grafts between the humeral artery and the superficial palmar arch. After failure of a local flap, an anterior-lateral thigh perforator flap was successfully transferred with end-to-side anastomoses on the arterialized venous graft. Up to date follow-up shows a good outcome. The Authors discuss the case and review the indications for microsurgical reconstruction in difficult wounds after radiation and ischemic limb conditions.

Review of the radial free flap: is it still evolving, or is it facing extinction? Part one: soft-tissue radial flap

The versatile fasciocutaneous radial flap is robust and reliable, straightforward to harvest, and often produces a satisfactory reconstruction with relatively little long-term morbidity at the donor site. Many surgeons prefer to use a limited number of trusted flaps, and these qualities will ensure that in the intermediate future most surgical trainees will continue to be shown the fasciocutaneous radial flap as both the basic training flap and the established option for reconstruction. Evidence from observational clinical studies and one randomised clinical trial indicates that there is increasing support for the use of the evolutionary technique of suprafascial dissection to minimise morbidity at the donor site. The suprafascial donor site may be repaired with either a meshed or unmeshed partial-thickness skin graft, or a fenestrated full-thickness skin graft, with good rates of successful healing. The application of a negative pressure dressing to the wound seems to facilitate the healing of all types of skin graft. The subfascial donor site, however, remains more prone to complications. It may be helpful to position the donor site of the flap more proximally, but this has not been proven. These refinements probably produce the best outcomes that can currently be achieved, given the inherent flaws of the radial donor site.

A pedicled anterolateral thigh flap for abdominal reconstruction after previous degloving injury of the donor site: Revascularisation of the donor site

A pedicled anterolateral thigh flap was used to reconstruct an abdominal defect after traumatic degloving of the entire skin of the right upper leg two-and-a-half years earlier. There are few reports about revascularisation of skin flaps after previous interruption of the blood supply. As far as I know this is the first report of a revascularised (anterolateral thigh) perforator flap.

Super-thinned iliac flap for major defects on the elbow and wrist flexion creases

Four free iliac flaps were used to treat or prevent flexion contracture at the elbow or wrist flexion crease. Flap size ranged from 13 x 6 cm to 18 x 8 cm. Two flaps were used for primary coverage, and the other 2 flaps were used to treat established flexion contractures. All flaps survived without vascular complications. Full range of motion was obtained at the elbow and 40 degrees of active extension was obtained at the wrist. The flap has a very thin dermis with minimal panniculus that can be thinned as required, making it ideal to cover flexion creases. Despite the fact that anatomic variations are common in the inguinal region, the flap can be expeditiously and safely elevated. If needed, pedicle length can be up to 8 to 10 cm. The donor site is comparable with that of a full-thickness skin graft harvested from the groin. The donor artery, however, can be very small.

Chest wall reconstruction using a turbocharged chimaeric anterolateral thigh flap

Extremely large chest wall defects may result following salvage oncological surgery. Typically these defects involve a large skin defect combined with a variable resected area of underlying muscle and ribs. In situations where the skin defect is very large the use of a large latissimus dorsi flap may require skin grafting to the donor site if a myocutaneous flap is used or to the recipient defect if a muscle-only flap is used. Alternatively a transverse rectus abdominis flap is a second option but in certain cases this may not be available. We describe the use of a free anterolateral thigh flap to reconstruct a chest wall defect and demonstrate the principle of side-to-side stacking of separate skin paddles to achieve skin closure of a massive defect whilst permitting primary closure of the donor site. The principle of turbocharging components of a chimaeric flap is also described.

Demonstration of circulation haemodynamics in random pattern thinned skin flap (an experimental study)

BACKGROUND

Clinical applications and indications of the thin skin flap have been widely documented but its circulation haemodynamics are still controversial. An experiment was conducted on pigs to show the survival and circulation haemodynamics of random pattern thinned skin flap.

METHODS

Group I: Random pattern standard skin flaps; 5 x 5 cm (n=20 flaps), and 5 x 10 cm (n=20 flaps). Group II: Random pattern thin skin flaps; 5 x 5 cm (n=20 flaps), and 5 x 10 cm (n=20 flaps). Group III: Random pattern thin skin flaps with silicone sheet underneath; 5 x 5 cm (n=20 flaps), and 5 x 10 cm (n=20 flaps).

RESULTS

The mean surviving skin area of the 5 x 10 cm flaps was 95.5% in Group I, 64.9% in Group II, and 33.67% in Group III. A statistically significant difference (P<0.05, ANOVA) was found between the groups. The mean surviving skin area of the 5 x 5 cm flaps was 100% in Groups I and II, and 68.2% in Group III. A statistically significant difference (P<0.05, ANOVA) was also found between Groups I and III, and Groups II and III. In microangiographical studies, the distribution of subcutaneous plexuses was clearly visible in Group I. In Group II the subdermal vascular plexus was observed less frequently and was thinner, particularly on the distal part of the flaps. In Group III dilatation of the subdermal vascular plexus was evident, particularly on the proximal section of the flaps. In the technetium-99m-labelled microspheres uptake of the 5 x 10 cm flaps, there was no statistically significant difference between the first segments in Groups I and II, Groups II and III (P>0.05, ANOVA). A significant difference was found between the second segments in Groups I and III (P<0.05, ANOVA).

CONCLUSION

The results obtained in this study show that the effect of subdermal vascular plexus in the survival of the random pattern thinned skin flaps is supported by flap bed osmosis and plasma imbibition.

The thin circumflex scapular artery perforator flap

The development of microsurgery has most recently been focused upon the evolution of perforator flaps, with the aim of minimising donor site morbidity, and avoiding the transfer of functionally unnecessary tissues. The vascular basis of perforator flaps also facilitates radical primary thinning prior to flap transfer, when appropriate. Based upon initial clinical observations, cadaveric, and radiological studies, we describe a new, thin, perforator flap based upon the circumflex scapular artery (CSA). A perforator vessel was found to arise within 1.5cm of the CSA bifurcation (arising from the main trunk, or the descending branch). The perforator arborises into the sub-dermal vascular plexus of the dorsal scapular skin, permitting the elevation and primary thinning of a skin flap. This thin flap has been employed in a series of five clinical cases to reconstruct defects of the axilla (two cases of hidradenitis suppurativa; pedicled transfers), and upper limb (one sarcoma, one brachial to radial artery flowthrough revascularisation plus antecubital fossa reconstruction, and one hand reconstruction with a chimeric flap incorporating vascularised bone, fascia, and thin skin flaps; free tissue transfers). No intramuscular perforator dissection is required; pedicle length is 8-10cm and vessel diameter 2-4mm. There was no significant peri-operative complication or flap failure, all donor sites were closed primarily, patient satisfaction was high, and initial reconstructive aims were achieved in all cases. Surgical technique, and the vascular basis of the flap are described. The thin circumflex scapular artery perforator flap requires no intramuscular dissection yet provides high quality skin (whose characteristics can be varied by orientation of the skin paddle), and multiple chimeric options. The donor site is relatively hair-free, has favourable cosmesis and no known functional morbidity. This flap represents a promising addition to the existing range of perforator flaps.

Tertiary resurfacing after one of the first free flaps in Europe, a reflection on 30 years of microsurgical progress

Free flaps have been used for over 30 years. During this period, improved anatomical understanding has increased donor options and available pedicle lengths, permitting safer, single-stage reconstructions with simpler anastomoses. Refinements, such as perforator flaps in particular, have greatly improved donor morbidity, recipient site cosmesis, and the ability to replace 'like with like' while retaining options for innervation. This case highlights the evolution from one of Europe's first free tissue transfers, effectively a perforator flap, through the advent of free muscle flaps to the current generation of contourable perforator flaps. Free flap transfer has become increasingly sophisticated, safer, and more predictable, yet the potential quality of reconstructive outcome has changed little.

The Cutaneous Arteries of the Anterior Abdominal Wall: A Three-Dimensional Study

BACKGROUND

Abdominal perforator flaps represent a natural progression in the quest to minimize abdominal wall morbidity. Their one disadvantage is the significant rate of vascular complications to which they are subject in some series. The authors examined the vascular anatomy of the abdominal integument, to determine why such complications occur and how they may be prevented.

METHODS

In 10 fresh cadavers, major arteries supplying the abdominal wall were injected with a lead-based contrast medium. The abdominal integument of each cadaver was imaged using a 16-slice spiral computed tomography scanner, to produce three-dimensional reconstructions of the arterial anatomy. Reconstructions were observed for orientation, course, and morphology of the major perforators within the abdominal integument.

RESULTS

Perforators of the deep inferior epigastric artery (DIEA) varied markedly in their orientation, course, and morphology among specimens. By contrast, perforators of the superior epigastric artery (SEA) were relatively consistent in their morphology and orientation. In eight of 10 specimens, SEA perforators with extensive anatomical "territories" orientated toward the umbilicus were present. These SEA perforators pierced the rectus sheath within 4 cm of the costal margin and were present bilaterally in seven of eight specimens.

CONCLUSIONS

The unpredictable orientation and course of DIEA perforators indicate that the blood supply of abdominal perforator flaps, raised without clear knowledge of their unique vascular anatomy, may often be more random than axial. This may account for much of the ischemia-related morbidity observed with DIEA-based perforator flaps. Preservation of SEA perforators adjacent to the costal margin during abdominoplasty will likely improve abdominal wall perfusion and reduce donor-site morbidity.

Initial assessment and management of complex forearm defects

Complex trauma to the forearm often involves significant damage to or loss of bone, muscle, skin, tendons, and neurovascular structures. Treatment focuses on regaining long-term hand function, which is best achieved by combining plastic and orthopedic surgical expertise in a team that includes experienced upper arm rehabilitation therapists. The reconstruction goal is to restore a level of hand function that allows the patient to incorporate the injured hand back into daily activities. We define complex defects as those involving significant segmental loss of one or more tissue types. This article provides a framework by which these often formidable and overwhelming injuries can be approached, and discusses some of the surgical options used to reconstruct complex defects of the forearm.

The Utility of the Anterolateral Thigh Donor Site in Reconstructing the United States Trauma Patient

BACKGROUND

Identification of a single donor site capable of providing all the components of the soft tissue envelope and the ability to selectively harvest a subset of these components is a central requirement for the microvascular reconstruction of the trauma patient. The anterolateral thigh (ALT) flap's long pedicle and adaptability in supporting a variety of tissues (muscle, fascia, soft tissue) make it a valuable tool for microsurgical reconstruction in these challenging patients. We investigated the utility of the ALT as a donor for microvascular tissue reconstruction in a Level I trauma center.

METHODS

We conducted a retrospective chart review on all trauma patients treated by the plastic surgery service at the R Adams Cowley Shock Trauma Center who required microsurgical free flap coverage from July 2002 to March 2005. Fifty-eight patients underwent reconstruction of traumatic deformities with 62 microvascular free flaps from the ALT region.

RESULTS

Of the 58 patients, 42 were male and 16 were female with an average age of 39 years. Recipient site locations for the 62 flaps were lower extremity, upper extremity, trunk, and head and neck. Analysis of flap anatomy revealed that 43 were fasciocutaneous, 14 were myocutaneous, 2 were adipofascial, and 3 were myofascial (vastus lateralis muscle). Six flaps were based on septocutaneous perforators, whereas the remainder contained myocutaneous perforators. Nine thigh donor sites required a split thickness skin graft, and 53 were closed primarily. The size of the flaps ranged from 36 cm2 to 600 cm2.

CONCLUSIONS

The ALT is a predictable donor site that facilitates a 2-team approach. ALT displays minimal donor site morbidity and in most cases provided sufficient tissue to cover the entire traumatic defect. Our results suggest the ALT is a reliable tissue source and an ideal donor site for the management of complex traumatic wounds in the United States.

Microvascular Reconstruction of the Upper Extremity

BACKGROUND

Upper extremity composite tissue defects may result from trauma, tumor resection, infection, or congenital malformations. When reconstructing these defects the ultimate objectives are to provide adequate soft tissue protection of vital structures, and to provide optimal functional and esthetic outcomes. The development of clinical microsurgery has added a large number of treatment options to the trauma surgeon's armamentarium - primarily replantation of amputated tissues and transplantation of vascularized tissues from distant donor sites. Since the early 1970s, considerable refinement in microsurgical tools and techniques together with a better understanding of the anatomy and physiology of microcirculatory tissue perfusion led to the introduction of a variety of thin, pliable and versatile-free flap designs.

METHODS

Sources for this manuscript include a comprehensive literature search using the PUBMED and EMBASE databases along with relevant text books, Selected Readings in Plastic Surgery(®), and personal experiences of upper extremity reconstruction and microsurgery.

RESULTS

In this manuscript, we describe the primary microsurgical techniques used to reconstruct upper extremity tissue defects and discuss the basis for selecting one technique over another.

CONCLUSION

Where possible, the best results may be achieved by reattaching the amputated original tissues (microsurgical replantation). In noninfected, uncontaminated traumatic injuries resulting in composite soft tissue defects, Early free flap reconstruction of the upper extremities has important advantages over delayed (72 h-3 months) or late wound closure (3 months-2 years). In recent years, thin, pliable, and versatile fasciocutaneous flaps such as the anterolateral thigh (ALT) and lateral arm (LA) free flaps have been increasingly used with great success to reconstruct the upper extremity. The use of "spare parts" and functional reconstructions using osteomyocutaneous free flaps or toe to thumb transfers complete the armamentarium of the upper limb reconstructive microsurgeon.

The Anterolateral Thigh Flap is Highly Effective for Reconstruction of Complex Lower Extremity Trauma

BACKGROUND

Trauma patients with high-energy injuries often present with severe tissue damage that extends beyond the immediate zone of injury and requires recruitment of vascularized tissues from distant sites. The objective of this study was to evaluate the utility of the anterolateral thigh (ALT) flap for reconstruction of the traumatically injured lower extremity.

METHODS

Prospective data were collected on all patients who underwent lower extremity reconstruction with an ALT flap during a 3.5-year period at a primary adult resource center (PARC). Demographics captured included age, gender, Injury Severity Score, mechanism of injury, and size of defect and complications.

RESULTS

Fifty-six patients underwent a total of 59 ALT flap harvests during the study period. The majority of patients were male (75%) and sustained blunt injury (95%). The mean age was 37 +/- 14 years with a mean Injury Severity Score of 17.9 +/- 8. The mean flap size was 20.7 x 8.4 cm, with 64% harvested from the injured limb. Total flap success rate was 91.5%, with four total (6.7%) and one partial flap failure (1.7%).

CONCLUSION

The ALT flap is a useful tool for trauma reconstruction in lower extremity salvage. We have shown that the ALT flap can be performed successfully in the traumatically injured patient even when harvested from the ipsilateral lower extremity.

Full-thickness skin graft as a one-stage debulking procedure after free flap reconstruction for the lower leg

BACKGROUND

Bulky appearance is one of the major patient complaints after lower leg reconstruction with free flap transfer. This unsatisfactory outcome results from protuberance of the reconstructed section and an unequal limb diameter when compared with the normal side. Serial debulking procedures, such as staged excision, can result in some improvement, but these methods are time consuming and do not provide a one-stage procedure for flap thinning, especially for the pretibial area, ankle, and foot. The authors used a full-thickness skin graft as a one-stage debulking procedure to achieve good aesthetic and functional results.

METHODS

From January of 2002 to June of 2004, 24 secondary debulking procedures were performed on 24 patients who had undergone reconstruction with free anterolateral thigh flaps. There were 12 perforator flaps and 12 myocutaneous flaps. Six flaps were on the pretibial area, eight were on the ankle, and 10 were on the foot. The full-thickness skin was taken away from the flap and regrafted onto the defatted wound.

RESULTS

All of the skin grafts took well, except in three cases where there was superficial necrosis on the ankle. The circumference of the reconstructed limbs decreased to an average of 3.6 +/- 0.7 cm (mean +/- SD, n = 24), with no difference as compared with the normal side.

CONCLUSIONS

This method can provide a one-stage debulking procedure for the pretibial area, ankle, and foot after free flap reconstruction, and achieves good aesthetic and functional outcomes.

Free Tensor Fascia Lata Perforator Flap as a Backup Procedure for Head and Neck Reconstruction

Free tissue transfer is an essential part of the head and neck reconstruction. Despite several flap options, free perforator flaps have become very popular for head and neck. Anterolateral thigh perforator flap has multiple advantages among other options and is preferred by most of the reconstructive microsurgeons. Besides its advantages, sometimes it is impossible to harvest an anterolateral thigh perforator flap, and the surgeon has to shift to another option. Between January 2002 and June 2005, 5 tensor fascia lata perforator flaps were used for head and neck reconstruction because anterolateral thigh perforator flap could not be elevated due to absence or insufficient musculocutaneous perforators. Only 1 flap was reexplored and salvaged by redoing the venous anastomosis. All flaps survived without any other problem. Donor sites were covered by split-thickness skin grafts in 4 patients and closed directly in 1 of them. Doppler examination is important in planning of anterolateral thigh perforator; if the signals of the perforators are absent or very weak, the surgeon can shift to another flap. This decision may also be made during the operation when insufficient perforators are seen. Based on our experience, tensor fascia lata perforator flap is a safe alternative when anterolateral thigh perforator harvest is not possible. Tensor fascia lata perforator flap can be harvested from the same anatomic region with almost same morbidity.

The anterolateral thigh as a universal donor site for soft tissue reconstruction in maxillofacial surgery

OBJECTIVE

The experience with 191 flaps from the anterolateral thigh is described with special regard to variations of vascular anatomy and possible flap designs.

PATIENTS

Since 1992, 191 flaps from the anterolateral thigh donor site were used in 187 patients. The size of the defects varied from 3 x 5 cm to 21 x 10 cm, being located in nearly all areas of the head and neck region including the skull base.

METHODS

The functional and aesthetic outcome was routinely evaluated during follow-up of the patients. All complications and secondary procedures were documented during the whole follow-up period ranging from 4 weeks to 11.2 years.

RESULTS

Six different patterns of variations were observed concerning the flap pedicle, but none of these resulted in failure of flap raising except for two patients, in whom no perforators could be found. Poor functional results were observed in 17 patients, and debulking procedures or scar revisions were carried out in 58 of the 187 patients. Nine flap types reaching from voluminous and large myocutaneous flaps to ultra-thin cutaneous perforator flaps were used, enabling closure of virtually any type of soft tissue defect. Twelve flaps were lost, resulting in a success rate of 93.7%.

CONCLUSION

Due to the combined advantages of minimal donor site morbidity, the option of simultaneous flaps and the satisfying results, the anterolateral thigh can be considered a universal donor site which is ideally suited for soft tissue reconstruction in cranio-maxillofacial surgery.

Reconstruction of the diabetic foot using the anterolateral thigh perforator flap

BACKGROUND

The purpose of this study was to evaluate the outcome of the diabetic foot reconstructed with the anterolateral thigh perforator flap.

METHODS

This study reviews 71 cases of salvaged diabetic foot over a 52-month period. Patients ranged in age from 33 to 72 years (average, 51 years), with an average follow-up of 11 months.

RESULTS

Flaps survived in all but one reconstructed case, resulting in equivocal findings compared with microvascular free tissue transfer of nondiabetic patients. Early complications such as delayed healing with minor wound dehiscence were seen in three cases, and partial flap necrosis was seen in four cases. Patients with chronic infections were controlled without recurrences. During the follow-up, 69 patients achieved full weight bearing, acceptable contour, and quality of gait before diabetic foot complications. However, late complications such as recurrence of ulceration was noted in one patient, who was blind and unable to perform daily inspection of the foot.

CONCLUSIONS

The anterolateral thigh perforator flap provides well-vascularized tissue that controls infection, a thin flap that provides one-stage contouring and minimizes shearing, and a skin paddle that resists pressure and improves durability. The flap can also be combined with vastus lateralis muscle to increase bulk and blood supply against large dead spaces and chronic infections. Anterolateral thigh perforator flaps can be used to achieve acceptable function and aesthetic results for diabetic foot reconstruction.

First web-space reconstruction by the anterolateral thigh flap

Four patients with severe contracture of the first web space were treated with an anterolateral thigh perforator flap. The flap size ranged from 10 to 13 cm in length and from 7 to 8 cm in width. The donor site was closed directly and thinning of the flap was performed in all cases. All flaps survived and there were no re-explorations. Web space opening was maintained over the follow-up period. There was an average postoperative increase of the angle of the first web space of 61 degrees. The thinned anterolateral thigh flap provides a pliable vascularized tissue for resurfacing the skin after release of severe contracture of the first web space and represents a reliable alternative to other flaps.

Free Microdissected Thin Groin Flap Design with an Extended Vascular Pedicle

BACKGROUND

The senior author has developed a method of microdissection whereby a thin perforator flap can be elevated accurately in a single-stage procedure. Recently, the authors also applied the microdissection technique to the inguinal area and elevated microdissected thin groin flap.

METHODS

In preparation of the flap, the perforator penetrating the fascia of the sartorius muscle is initially detected suprafascially, and then the deep adipose and subfascial layer of the inguinal area is dissected using an operating microscope. After confirming the distribution of the blood vessels in this area, the flap is elevated while dissection is performed between the deep and superficial adipose layers.

RESULTS

Six cases of scar contracture or skin defect by general burn, three cases of other types of traumatic tissue defects, and one case of skin loss at the donor site of an extended wraparound flap were successfully reconstructed with these new flaps.

CONCLUSIONS

The uniform thinness and long vascular pedicle are distinctive characteristics of this flap compared with the traditional groin flap. Moreover, the buried vessels in the deep adipose layer and fascia can be confirmed by microdissection; this enables prediction of the safe area of the flap.

Perforator flaps in head and neck surgery

A 'perforator flap' is a flap of skin or subcutaneous tissue that is based on the dissection of a 'perforating vessel'. Over the past few years a large number of 'perforator flaps' have been devised and described. By reducing any muscle harvest and trauma to a minimum, perforator flaps aim to minimize donor site morbidity whilst providing the reconstructive surgeon with more versatility than other flap types. The principal perforator flaps are discussed, particularly those employed in head and neck reconstruction including 'free style perforator flaps'. Methods of locating perforating vessels for the use of perforator flaps are described. The technique of perforator flap harvest is illustrated as exemplified in the anterolateral thigh perforator flap. Advantages in the use of this flap for head and neck reconstruction are discussed and are compared with that of non-perforator flaps, particularly the Radial Forearm Flap. The role of the primary thinning of perforator flaps is discussed. The versatility of the anterolateral flap is discussed, which may well supersede the Radial Forearm Flap as the principal soft tissue flap used in head and neck surgery.

Thin Anterolateral Thigh Perforator Flap Using a Modified Perforator Microdissection Technique and Its Clinical Application for Foot Resurfacing

BACKGROUND

A thin skin flap is often required for optimal resurfacing of particular areas of the body. An anterolateral thigh perforator flap can be thinned to an extent to which it is vascularized by the subdermal plexus only. This study presents a novel flap thinning technique and its application for resurfacing the dorsum of the foot.

METHODS

From July of 2002 to October of 2003, 18 patients underwent resurfacing of the dorsum of the foot with thin anterolateral thigh flaps. The main perforators were strategically located in the flap center to keep the peripheral area within the vascular territory. The flaps were larger than needed, initially elevated subfascially, and then thinned to the suitable thickness while the pedicle was still attached. The dissection of perforators in the adipose layer close to the dermis entry was carried out microscopically. Flap sizes ranged from 3 x 3 to 16 x 8 cm.

RESULTS

Seventeen flaps survived completely and one had distal superficial necrosis of 1 x 2 cm. No debulking procedures were necessary. Average follow-up was 12 months.

CONCLUSIONS

A thin flap vascularized through subdermal plexus is reliable. Microsurgical dissection of the perforator is a recommended technique. The thin anterolateral thigh perforator flap provides ideal reconstruction in resurfacing the dorsum of the foot.

Reconstruction of the Face After Resection of Arteriovenous Malformations Using Anterolateral Thigh Perforator Flap

Arteriovenous malformations are high flow lesions that remain a challenge in the field of plastic surgery, interventional radiology, and neurosurgery. This is especially true for large lesions requiring a comprehensive team approach. From March 2001 to August 2004, six patients with arteriovenous malformation having extensive involvement of the skin underwent selective embolization followed by resection and reconstruction with anterolateral thigh perforator flap. The age of patients ranged from 22 to 43 years (average, 29 years); four were male and two were female. The size of the defect ranged from 8 x 10 cm to 12 x 14 cm. During the follow-up period from 3 months to 41 months, two patients required ancillary procedures to improve their aesthetic appearances. All patients achieved acceptable contour, appearance, and sensation without any incidence of recurrences. The anterolateral thigh perforator flap provides a large, thin and sensible flap. The anatomy of the flap is relatively constant and reliable. Despite the extensive involvement of arteriovenous malformation of the face, with selective embolization, maximal resection, and coverage with a well-vascularized tissue, it can be safely removed and successfully reconstructed.

Hand Reconstruction Using the Thin Anterolateral Thigh Flap

BACKGROUND

Perforator flaps have been introduced for various kinds of reconstruction and resurfacing; in particular, the free thin anterolateral thigh flap is becoming one of the most preferred options for reconstruction of soft-tissue defects.

METHODS

Between 1999 and 2002, the authors used this flap as a free flap for nine cases for covering hand defects after burn, crushing injuries, or severe scar contracture release. There were eight men and one woman, the mean age of the patients was 31 years, and the size of the flaps ranged from 7 x 3.5 cm to 15 x 9 cm; thinning was performed in all flaps.

RESULTS

All flaps survived completely, and the donor site was closed directly in seven cases; in two cases, the exposed muscle was covered with split-thickness skin graft.

CONCLUSIONS

The anterolateral thigh flap was thin enough for defects on the dorsum and/or palm of the hand and for first web reconstruction after scar contracture release. It has many advantages in free flap surgery including a long pedicle with a suitable vessel diameter, and the donor-site morbidity is acceptable. The thin anterolateral thigh flap is a versatile soft-tissue flap that achieves good hand contour with low donor-site morbidity.

The combined free partial vastus lateralis with anterolateral thigh perforator flap reconstruction of extensive composite defects

Myocutaneous (MC) free flaps are useful for many reconstructive indications. Perforator flaps have become standard of care. The anterolateral thigh flap (ALT) donor site is popular. With the ALT flap varying sizes of vastus lateralis (VL) muscle can be harvested as a MC flap. The skin islands of these flaps have a great range of freedom when dissected on their perforator. It was hypothesised that the VL-ALT perforator flap would offer adequate tissue volume combining maximal freedom in planning with minimal donor site morbidity. From November 2001 to February 2003 a free partial VL with ALT perforator flap was used in 11 patients to reconstruct large defects. Indications for adding a muscular component were exposed bone, skull base, (artificial) dura, or osteosynthesis material, open sinuses, and lack of muscular bulk. Flaps were planned as standard ALT flaps, after which three types of dissection were performed: I. true MC flap; II. muscle flap with a skin island on one perforator, which could be rotated up to 180 degrees ; III. chimera skin perforator flap with muscle being harvested on a separate branch from the source vessel or on a side branch of the skin perforator. Mean skin size of the MC-ALT flaps was 131 cm2. Mean muscle part size of the MC-ALT flaps was 268 cm3. Muscular parts were custom designed for all defects. No total or partial flap failures were seen. Colour mismatch was seen in 6 of 8 patients, when skin was used in the facial area in this all white population. Excessive flap bulk was found in 8 of 11 patients at 6 weeks, however, only in 2 of 11 patients after 6 months. Patients were satisfied with the functional result (8 of 11 patients) as well as the cosmetic result of their reconstruction (7 of 11 patients). All less satisfied patients had received their flap for external facial skin reconstruction. Donor site morbidity was minimal. The combined free partial VL with ALT perforator flap proved valuable as a (chimera type) MC flap with maximal freedom of planning to meet specific reconstructive demands and minimal donor site morbidity.

Defining Vascular Supply and Territory of Thinned Perforator Flaps: Part I. Anterolateral Thigh Perforator Flap

BACKGROUND

The anterolateral thigh perforator flap is increasingly being used for trauma and reconstructive surgical cases. With the thinned flap design, greater survivability and a decrease in donor-site morbidity are observed. To increase our knowledge of the vascular territories in these flaps, an anatomic study was performed to determine pedicle number, location, and diameter; accompanying veins; vascular territory; and where surgical incisions can be made safely during thinning, as opposed to the "danger zone."

METHODS

Thirteen anterolateral thigh perforator flaps were harvested from seven adult cadavers. The largest perforator arteries were cannulated, and flaps were thinned to a thickness of 6 to 8 mm, with a 2.5-cm radius from the perforator retained. Vascular territories were quantified before and after thinning by nonradiographic and radiographic methods. A series of dyes were injected: red dye for skin (photography) followed by Omnipaque for the whole flap (radiography) before thinning, and blue dye for skin (photography) and lead oxide for the whole flap (radiography) after thinning. Pedicle locations were determined by ratios of anatomical landmarks. Danger zone measurements were derived at specific thicknesses using lateral radiographs of each flap.

RESULTS

In anterolateral thigh perforator flaps, the mean perforator artery diameter at the fascia level was 1.00 +/- 0.08 mm (range, 0.84 to 1.11 mm) and the mean number of perforator arteries was 1.69 +/- 1.03 (+/-SD). Perforator pedicles were located near the midpoint of the line between the anterior superior iliac spine and the lateral aspect of the patella in the vertical axis. The mean vascular territories were 256 +/- 52.5 cm2 (photography) and 351 +/- 72.8 cm2 (radiography) in unthinned flaps and 211 +/- 65.7 cm2 (photography) and 289 +/- 106.6 cm2 (radiography) in thinned flaps. Differences in overall vascular territories after thinning were 83.3 percent (photography) and 81.8 percent (radiography) compared with unthinned flaps. Four respective vascular territory maps were drawn showing surgical territories using percentile confidence intervals (98th and 90th) and averages. From the skin at thicknesses of 4, 6, and 8 mm, the 98th percentile danger zones were 33 to 37 mm (proximal to distal), 30 to 35 mm, and 27 to 31 mm from the pedicle in the vertical axis, respectively; in the horizontal axis, they were 30 to 34 mm (medial to lateral), 28 to 31 mm, and 25 to 29 mm.

CONCLUSIONS

These data define anterolateral thigh perforator flap pedicle location, number, and diameter before harvesting, surgical danger zones during thinning, and vascular territories after thinning. The authors' guidelines provide surgeons with anatomical vascular territory maps to design and harvest specific flaps for optimal results.

Use of the anterolateral thigh free flap for upper-extremity reconstruction

PURPOSE

The anterolateral thigh free flap (ALTF) first was reported in 1984 and has been used in large series with success for a multitude of clinical purposes. We describe our results with the ALTF in upper-extremity and hand reconstruction.

METHODS

From 1996 to 2003 there were 15 patients who had reconstruction of the hand and upper extremity using the ALTF. The parameters used to assess the outcome of our series included the success rate of the flap as measured by flap survival rate and adequacy of skin coverage, ability to close the donor site primarily or necessity of a skin graft, complications associated with the flap, donor site, and non-flap-related complications such as pulmonary embolism.

RESULTS

Of the 15 patients with an ALTF, 3 (20%) had a musculocutaneous perforator and 12 (80%) had a septocutaneous perforator. Two patients had a neurotized ALTF reconstruction. There were 4 complications related to the flap with 1 complete flap failure. The overall flap survival rate was 93%. The donor site was closed primarily in 8 patients (53%) and with a skin graft in 7 patients (47%). One donor site breakdown occurred.

CONCLUSIONS

Our results show many advantages of the ALTF for upper-extremity reconstruction. Because of its versatility the ALTF is suited ideally for upper-extremity reconstruction and should be considered as part of the reconstructive ladder.

Application of ???Simplified Nomenclature for Compound Flaps??? to the Anterolateral Thigh Flap

BACKGROUND

The anterolateral thigh flap is becoming a workhorse flap for soft-tissue and coverage reconstruction. It can be elevated in various ways with various tissues combinations. However, there is no consensus on nomenclature for communication, which has resulted in misunderstanding and confusion.

METHODS

The authors propose a new terminology for classification of the anterolateral thigh flap based on the "simplified nomenclature for compound flaps" introduced by Hallock. The intention of this new terminology is to describe both tissue components and skin vessel type.

RESULTS

Anterolateral thigh flaps can be classified into two subgroups according to the tissue components, as follows: cutaneous or compound. The skin vessel types can also be classified into two subgroups according to the course they traverse: septocutaneous vessel or myocutaneous perforator.

CONCLUSION

This classification may bring a consensus on the nomenclature of anterolateral thigh flaps and would be applicable to other perforator flaps.

The Innervated Anterolateral Thigh Flap: Anatomical Study and Clinical Implications

During the past 20 years, the neural anatomy of many flaps has been investigated, although no extensive studies have been reported yet on the anterolateral thigh flap. The goal of this study was to describe the sensory territories of the nerves supplying the anterolateral thigh flap with dissections on fresh cadavers and with local anesthetic injections in living subjects. The sensate anterolateral thigh flap is typically described as innervated by the lateral cutaneous femoral nerve. Two other well-known nerves, the superior perforator nerve and the median perforator nerve, which enter the flap at its medial border, might have a role in anterolateral thigh flap innervation. Twenty-nine anterolateral thigh flaps were elevated in 15 cadavers, and the lateral cutaneous femoral nerve, the superior perforator nerve, and median perforator nerve were dissected. In the injection study, the lateral cutaneous femoral nerve, superior perforator nerve, and median perforator nerve in 16 thighs of eight subjects were sequentially blocked. The resulting sensory deficit from each injection was mapped on the skin and superimposed on the marked anterolateral thigh flap territory. The study shows that the sensate anterolateral thigh flap is basically innervated by all three nerves. The lateral cutaneous femoral nerve was present in 29 of 29 thighs, whereas the superior perforator nerve was present in 25 of 29 and the median perforator nerve in 24 of 29 thighs. Furthermore, in the proximal half of the flap, the lateral cutaneous femoral nerve lies deep, whereas the superior perforator nerve and median perforator nerve lie more superficially. Whereas the lateral cutaneous femoral nerve innervates the entire flap, the superior perforator nerve innervates 25 percent of the flap and the median perforator nerve innervates 60 percent of the flap. Clinically, a small anterolateral thigh flap (7 x 5 cm) can be raised sparing the lateral cutaneous femoral nerve and using only the selective areas innervated by the superior perforator and median perforator nerves. Alternatively, a large anterolateral thigh flap can be raised with this multiple innervation. This can be helpful if one wants to harvest the flap under local anesthesia. Sensate bilobed flaps can be harvested when dual innervated flaps are required.

Le lambeau antérolatéral de cuisse. Étude rétrospective

The anterolateral thigh flap is a cutaneous or fasciocutaneous perforator flap, extensively used in China, Japan, Taiwan (Demirkan et al., 2000; Kimata et al., 1997; Koshima et al., 1993; Luo et al., 1999) but infrequently in Europe, probably because of variations in origin and course of the cutaneous perforators rending its use apparently less reliable. This study is about 13 anterolateral thigh flaps performed between November 1, 1998, and December 30, 2002, on 13 patients, four women, nine men. Among these 13 flaps, 11 were free flaps, two were pedicled flaps. The surgical procedure was decided because of loss of soft tissue localised in: floor of the mouth (2 flaps), limb (9 flaps), inguinal-illiac region (2 flaps). The mean age of patients was 47.7 years (ext. 23 years and 69 years). The quality of the result was evaluated by the surgeon as good or very good, fair or bad. The function of the donor site was evaluated by questionnaire of the patient and physical examination of knee extension. Three free flaps were re-explored because of venous thrombosis, one of them necrosed. No functional impairment was found. The result was evaluated by the surgeon as good or very good in 11 cases, fair for one case, "bad" in the case were the flap was lost. The results of the reconstructive procedure using the anterolateral thigh flap are satisfying. This flap is reliable if the surgical technique is strictly applied.