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Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

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Plast Aesthet Res 2020;7:24.
10.20517/2347-9264.2020.20 |  © The Author(s) 2020.
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Abstract

Reconstruction of dorsal hand soft tissue defects after severe injury is challenging for surgeons. Depending on the degree of defect, extensor tendon reconstruction may also be necessary. Various reconstruction methods are commonly performed to cover dorsal hand defects, such as skin grafting and distant, free, or local flaps. Among them, free vascularized flap transplantation is an ideal procedure because the major vessels that feed the local flap may have been damaged, and the affected limb can be reconstructed using a flow-through method. Although free flap surgery has advanced, few surgeons can choose this option due to its technical difficulty and uncertainty. On the other hand, distant flaps have been commonly used for the reconstruction of dorsal hand defects, and local flaps, such as reverse forearm flaps and retrograde posterior interosseous flaps, do not require microvascular anastomosis. However, they have some problems; distant flaps require at least two surgeries, reverse forearm flaps sacrifice major vessels and leave a scar at the donor site, and retrograde posterior interosseous flaps require meticulous dissection of the vascular pedicle. The radial artery perforator-based adipofascial flap is a versatile flap that is safe and easy to elevate without sacrificing the radial artery. In addition, elevating it as an adipofascial flap enables surgeons to avoid an unacceptable donor scar. We present two cases, demonstrating the usefulness of this pedicled perforator flap.

Keywords

Perforator, dorsal hand reconstruction, adipofascial flap, hand replantation, color Doppler ultrasonography

Introduction

Soft tissue defects of the dorsal hand are commonly caused by relatively high-energy trauma such as industrial accidents. In such cases, free vascularized flap transplantation is the ideal procedure because the major vessels in the zone of injury that may have been damaged, and the vascular supply of the flap and affected limb can be reconstructed using a flow-through method[1]. Although free flap surgery has advanced, not all surgeons can select this complicated procedure. Recently, several surgeons have reported local flap procedures for the reconstruction of dorsal hand defects[2,3]. Among them, the reverse radial forearm flap is a common method for the treatment of dorsal hand injuries[4]. This flap is reliable in regards to vascular supply; however, the main vessels of the forearm and hand must be sacrificed. Thus, this flap cannot be used, if Allen’s test shows an incomplete palmar arch. Moreover, unacceptable donor site morbidity is a major drawback of this flap. The posterior interosseous flap is also an effective option[5,6]. Although this flap enables covering the dorsal hand defect with well-vascularized tissue without sacrificing major vessels, it requires surgeons to perform fine and burdensome procedures. The radial artery perforator based adipofascial flap is a versatile flap that is safe and easy to elevate without sacrificing the radial artery[7,8]. In addition, elevating it as an adipofascial flap enables surgeons to avoid an unacceptable donor scar. We present two case reports demonstrating the usefulness of this pedicled perforator flap for dorsal hand reconstruction.

Anatomy and preoperative evaluation

Before flap elevation, contrast-enhanced computed tomography and/or color Doppler ultrasonography of the affected forearm were performed to evaluate the blood circulation of radial vessels. Using color Doppler ultrasonography, Onode et al.[9] reported that an average of six fasciocutaneous perforators arising from the distal radial vessels can be observed within 15 cm proximal to the distal wrist crease. There are two or more clinically significant (> 0.5 mm) cutaneous perforators at the pivot point within 2 cm proximal to the radial styloid[8]. The adipofascial flap on the lateral aspect of the distal forearm is raised proximal to distal, including the lateral antebrachial cutaneous nerve and the cephalic vein. Although a number of surgeons have reported using this flap, there is no consensus regarding the maximum safe longitudinal flap size. In our opinion, it can be the length of the forear, because as Taylor et al.[10] reported, designing the flap in the longitudinal direction along the cutaneous nerve and the cutaneous vein, blood circulation of a perforasome composed of multiple perforators connected to each other by a true anastomosis can be stabilized. Therefore, including the lateral antebrachial cutaneous nerve and the cephalic vein within the flap enables the distal perforator-based adipofascial flap to be applied safely [Figure 1A and B].

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 1. A, B: illustration of radial artery perforator-based adipofascial flap elevation, including connection of both perforators to the subdermal vascular network in the proximal and distal ends of the forearm. This flap can be elevated and transferred to the defect of the dorsal hand safely

Surgical procedure of radial artery perforator-based adipofascial flap transfer

1. Design a rectangular adipofascial flap along the radial artery sufficient to cover the defect. An S-shaped skin incision is favorable in consideration of the convenience of fascial flap dissection and direct closure of the skin [Figure 2A].

2. Dissect the subcutaneous plane sufficiently deep to avoid skin necrosis, leaving the dorsal forearm cephalic vein on the adipofascial flap.

3. After incising the proximal edge of the adipofascial flap, dissect the sub-fascial flap from the proximal to distal direction. Several perforators arising from radial vessels can be found in the distal one-third of the forearm. Next, elevate the flap through the intertendinous septum in the middle of the flexor carpi radialis, abductor pollicis longus, and brachioradialis tendons, and enter the fascia of the forearm. Under direct observation, at least one perforator entering the flap must be preserved around the styloid, which is a pivot point [Figure 2B].

4. Transfer the flap through the subcutaneous tunnel to the dorsal hand defect [Figure 2C].

5. Resurface the transferred fascial flap on the dorsal hand with a split-thickness skin graft [Figure 2D]. Elevate the affected arm and bandage with slight pressure to avoid postoperative congestion.

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 2. Procedure of radial artery perforator-based adipofascial flap elevation (From Case 1 in this article). A: the radial forearm adipofascial flap was designed along the radial artery. Red circle indicates pivot port; B: the adipofascial flap was elevated, preserving perforators at the distal end of the flap; C: once elevated, the flap was turned over or rotated to reach the dorsal defect; D: the donor site was closed and a skin graft was applied over the flap

Case reports

Case 1: reconstruction after hand replantation

A 43-year-old man had his hand amputated. He accidentally cut his non-dominant left hand with an electric saw while cutting wood [Figure 3A]. His left hand was amputated at the metacarpal level. X-ray examination and contrast-enhanced computed tomography of the affected limb were performed [Figure 3B and C]. The surfaces of both parts were crushed and severely damaged. Hand replantation surgery was performed under general anesthesia. After bone fixation and tendon repair, microvascular anastomosis was performed. The ulnar side of the palmar arterial was repaired, but not the radial side because the flow through the radial artery was insufficient. Venous repair was performed by vein grafting into three dorsal hand cutaneous veins. The dorsal hand defect after debridement of crushed skin was covered by artificial dermis. The amputated hand survived. Seventeen days after hand replantation surgery, the second operation for reconstruction of the dorsal hand tissue defect was performed. As contrast-enhanced computed tomography after hand replantation surgery revealed an incomplete palmar arch, the combination of a radial artery perforator adipofascial flap and split-thickness skin graft was selected. The radial artery perforators were identified using color Doppler ultrasonography and demarcated on the skin [Figure 4]. There was a 4-cm × 7-cm defect over the dorsal hand with exposure of extensor digitorum tendons after debridement of necrotized tissue. A lazy S-shaped longitudinal incision on the forearm was designed [Figure 5A]. An 18-cm × 5-cm radial artery perforator-based adipofascial flap was elevated. As a vascular pedicle, the distal radial artery fasciocutaneous perforator was left with the soft tissue around the styloid process [Figure 5B]. The flap was turned over and transferred to the defect. A skin graft was immediately placed over the flap. The donor site of the flap was closed [Figure 5C]. The postoperative course was uneventful. The flap and skin graft took completely. Half a year after surgery, the skin of the reconstructed dorsal hand was thin and pliable [Figure 6A and B]. In addition, there was no restriction in the mobility of the wrist or forearm [Figure 6C and D]. However, the thumb-index finger web space was narrow due to poor thumb bone healing caused by poor blood supply. A free flap transfer to the thumb-index finger web space is planned in the next surgery.

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 3. A 43-year-old male smoker with left hand amputation. A: amputated left hand; B: on X-ray, the left hand was completely cut at the metacarpal level; C: contrast-enhanced computed tomography showed poor blood circulation of the radial artery in the distal forearm

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 4. Preoperative color Doppler ultrasonography showed a perforator arising from the radial artery. The perforator was 1.8 mm in diameter. Most of the fasciocutaneous perforators were within 2 cm proximal to the styloid

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 5. A 43-year-old man 17 days after hand replantation surgery. A: a soft tissue defect of the dorsal hand still remains with exposure of bones and tendons; B: a distally based adipofascial perforator flap was raised from proximally to distally; C: a skin graft was applied over the flap and the donor site was closed

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 6. A 43-year-old man 6 months after dorsal hand reconstructive surgery. A, B: the reconstructed skin of the dorsal hand was thin and soft and the donor site was inconspicuous; C, D: the forearm had no adhesion and little restriction of the wrist

Case 2: functional reconstruction of index finger extension

A 62-year-old man accidentally injured his non-dominant left hand while shaving wood. Skin and soft tissue defects were observed, in addition to exposure of the second metacarpal bone head on the dorsal side [Figure 7A]. Emergency reconstructive surgery was performed. The radial artery perforators were identified using color Doppler ultrasonography. Following marked water lavage and debridement of necrotized soft tissue of the dorsal hand, there was a 6-cm × 3-cm defect over the dorsal radial hand. [Figure 7B]. A 10-cm × 5-cm distally radial artery perforator-based adipofascial flap was elevated. The palmaris longus tendon was included in the adipofascial flap to reconstruct the extension function of the index finger [Figure 7C]. As a vascular pedicle, the distal radial artery fasciocutaneous perforator was left with the soft tissue around the styloid process. The flap was transferred to the defect and the tendon was sutured with the extensor indicis muscle tendon using the interlacing suture technique [Figure 7D]. The tension strength of the tendon suture was adjusted in a functional position. The exposed metacarpophalangeal joint was simply covered with the adipofascial flap. A split-thickness skin graft from the thigh was placed over the flap and the donor of the flap was closed [Figure 7E and F]. After 3 weeks, the skin graft survived and rehabilitation using a dynamic splint was started. Ten months after surgery, index finger joint movement was slightly restricted. However, there was no problem in daily life and the color matching of the skin graft was good [Figure 8A-C].

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 7. A 62-year-old man with skin and extensor tendon avulsion on the dorsum of his index finger. A: the index MP joint was exposed; B: design of the forearm adipofascial flap along the radial artery; C: raising of the forearm adipofascial flap, including the palmaris longus tendon; D: interlacing suturing of the extensor digitorum tendon and palmaris longus tendon; E: split-thickness skin grafting over the adipofascial flap; F: the flap donor defect was closed

Dorsal hand reconstruction with radial artery perforator-based adipofascial flap

Figure 8. A 62-year-old man 10 months after reconstructive surgery for dorsal hand skin and extensor tendon defects. A: the color matching was good; B: extension of the index finger was close to full; C: all index finger joints have slightly limited flexion

Discussion

Reconstruction of dorsal hand tissue defects after hand injury is challenging for surgeons because of the exposure of blood vessels, nerves, tendons, and bones. Thus, skin grafts are not suitable for use in reconstruction in the case of severe injuries. Furthermore, the palmar arch may not be reconstructed after hand reconstruction, as in our case. In such cases, vascular insufficiency of the limb and flap may develop using retrograde-flow pedicle flaps[11]. Therefore, flap options that do not require retrograde blood flow are needed. In case 1, the radial artery perforator-based adipofascial flap was selected for reconstruction of a dorsal hand defect after hand replantation. When soft tissue of the dorsal hand is crushed and extensor tendons or bones are exposed or lost, soft tissue reconstruction using a flap with good circulation is required to resurface the defect. We were able to reconstruct the defects of blood vessels, nerves, and tendon by the adipofascial flap with forearm tissue. In case 2, the radial artery perforator adipofascial flap with the palmaris longus tendon was selected for reconstruction of the dorsal hand defect and the defect of the extensor indicis muscle tendon.

Currently, distant, free, or local flaps are generally used to cover dorsal hand defects [Table 1]. Distant flaps, including abdominal, groin, and intercostalis flaps, are simple and good options for large defects[12-14]. However, they require at least two surgeries and prolonged recovery periods. Although blood supply of these flaps is reliable, the risks of elbow or shoulder contracture are higher than other options due to the prolonged recovery period. In addition, it is difficult to reconstruct thin and pliable skin.

Table 1

Flap options for reconstruction of dorsal hand defects

Flap optionsAdvantagesDisadvantagesRepresentative flaps
Distant flapTechnically simple procedure
High reliability of blood supply
Relatively longer down-time
High risk of joint contracture
Requires at least two surgeries
Inability to reconstruct tendons
Bulky
Abdominal flap
Groin flap
Free flapReconstruction in one surgery
Low donor site morbidity and risk of joint contracture
Tendon reconstruction is possible
Technically complexFree anterolateral thigh flap
Free peroneal flap
Free groin flap
Local flapGood color and texture matching
Requires no microvascular anastomosis
Requires retrograde blood flow
High risk of donor site morbidity when a large flap is harvested
Retrograde posterior interosseous flap
Retrograde forearm flap

Free flaps, including anterolateral thigh flaps, lateral arm flaps, and scapular flaps, enable one-step reconstruction[15]. Moreover, donor site morbidity can be minimized, and the extensor digitorum tendon and its gliding surface can be reconstructed as required. Muneuchi et al.[16] reported that a free anterolateral thigh fasciocutaneous flap was useful to fill the dead space of a dorsal hand defect after resection of the bursa, and the flap also aided in reconstructing a two-layer gliding surface of the extensor tendons. However, as the arteries and veins are usually damaged, anastomosis of vessels is problematic.

Local flaps, including the retrograde posterior interosseous flaps and retrograde forearm flaps, have good color and texture matching for dorsal hand reconstruction[17]. However, retrograde posterior interosseous flaps require meticulous dissection and the posterior interosseous artery in the middle of the forearm varies. Furthermore, the presence of distal communication between the posterior interosseous artery and the anterior interosseous artery must be confirmed[17]. If communication between the two vessels is unsatisfactory, this flap cannot be used for reconstruction. Moreover, retrograde posterior interosseous flaps have been reported to have relatively high complication rates such as flap necrosis[18-20].

Taghinia et al.[3] recommended a retrograde radial forearm adipofascial flap to avoid functional problems caused by adhesion at the donor site. Although this flap is technically easier to use than the retrograde posterior interosseous flap, it has the disadvantage of sacrificing the main artery. In certain cases, such as Allen test-negative, this flap is not applicable because it requires retrograde blood flow.

In 1989, Koshima et al.[21] reported inferior epigastric artery skin flaps without rectus abdominis muscle and called them perforator flaps. Since then, many perforator flaps have been developed. The radial artery perforator-based flap is one, which does not require retrograde blood flow and can be applied to hand reconstruction without sacrificing major vessels[22,23]. Donor site problems can be minimized by using this flap as an adipofascial flap[22-24]. In addition, the thin and pliable dorsal hand skin can be reconstructed by performing skin grafting over the adipofascial flap. The extensor digitorum tendon can be reconstructed by including the tendon, such as the palmaris longus or brachioradialis tendon, in the adipofascial flap as described in Case 2[23,25]. Furthermore, this flap has a great advantage in that the procedure is simple and can be completed in a short time[23,24,26]. Although the patients may complain about pain due to fascial traction, it disappeared in approximately one month in our cases. The advantages and disadvantages of representative local flaps and radial artery perforator-based adipofascial flaps are summarized in Table 2.

Table 2

Advantages and disadvantages of representative local flaps and the radial artery perforator-based adipofascial flap

Local flapsAdvantagesDisadvantages
Retrograde posterior interosseous flapGood color and texture matching
Low risk of donor site morbidity
Requires meticulous dissection Relatively high complication rate
Limitation of flap size
Retrograde forearm flapTechnically easier than the retrograde posterior interosseous flap
Tendon reconstruction is possible
Requires sacrifice of the main artery
High risk of donor site dysfunction
Radial artery perforator-based adipofascial flapRetrograde blood flow is not needed
Sacrificing main artery is not required
Donor site morbidities are minimal
Possible to reconstruct thin dorsal hand by skin grafting
Tendon reconstruction is possible
Simple and short surgery
Temporary pain due to fascial traction
Skin graft is needed

Conclusion

The radial artery perforator-based adipofascial flap is an excellent functional reconstructive option for complex dorsal hand defects with minimal donor site morbidity.

Declarations

Authors’ contributions

Contributed to data acquisition and also provided administrative, technical, and material support: Yamakawa S, Hayashida K

Reviewed the manuscript for content and grammar/spelling mistakes: Yamakawa S, Hayashida K

Availability of data and materials

Not applicable.

Financial support and sponsorship

None.

Conflicts of interest

All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate

Written informed consent was obtained from both subjects to participate in this case report. A copy of the written consent is available for review upon request.

Consent for publication

Written informed consent was obtained from both subjects for publication of this case report and accompanying images. A copy of the written consent is available for review upon request.

Copyright

© The Author(s) 2020.

REFERENCES

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2. Medalie DA. Perforator-based forearm and hand adipofascial flaps for the coverage of difficult dorsal hand wounds. Ann Plast Surg 2002;48:477-83.

3. Taghinia AH, Carty M, Upton J. Fascial flaps for hand reconstruction. J Hand Surg Am 2010;35:1351-5.

4. Doğan T, Gürünlüoğlu R, Imer B, Numanoğlu A. The distally based forearm island flap in hand reconstruction. Plast Reconstr Surg 1999;104:1581-2.

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8. Saint-Cyr M, Mujadzic M, Wong C, Hatef D, Lajoie AS, et al. The radial artery pedicle perforator flap: vascular analysis and clinical implications. Plast Reconstr Surg 2010;125:1469-78.

9. Onode E, Takamatsu K, Shintani K, Yokoi T, Uemura T, et al. Anatomical origins of radial artery perforators evaluated using color Doppler ultrasonography. J Reconstr Microsurg 2016;32:594-8.

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12. Nazerani S, Motamedi MH, Nazerani T, Bidarmaghz B. Treatment of traumatic degloving injuries of the fingers and hand: introducing the “compartmented abdominal flap”. Tech Hand Up Extrem Surg 2011;15:151-5.

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16. Muneuchi G, Suzuki S, Ito O, Kawazoe T. Free anterolateral thigh fasciocutaneous flap with a fat/fascia extension for reconstruction of tendon gliding surface in severe bursitis of the dorsal hand. Ann Plast Surg 2002;49:312-6.

17. Liu DX, Wang H, Li XD, Du SX. Three kinds of forearm flaps for hand skin defects: experience of 65 cases. Arch Orthop Trauma Surg 2011;131:675-80.

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Cite This Article

Review
Open Access
Dorsal hand reconstruction with radial artery perforator-based adipofascial flap
Sho YamakawaSho  Yamakawa, Kenji HayashidaKenji  Hayashida

How to Cite

Yamakawa, S.; Hayashida K. Dorsal hand reconstruction with radial artery perforator-based adipofascial flap. Plast. Aesthet. Res. 2020, 7, 24. http://dx.doi.org/10.20517/2347-9264.2020.20

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This article belongs to the Special Issue Advances in Microsurgery for Hand Reconstruction
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