Reverse sural flap of the fasciosubcutaneous pedicle: a case report
Retalho sural reverso de pedículo fasciossubcutâneo: relato de caso

INTRODUCTION

Loss of substance in the lower third of the leg, especially Achilles tendon ruptures, which are common after orthopedic surgeries and are challenging for plastic surgeons because of the high rate of complications and occurrences,^1-3 usually requires complex surgical procedures for tissue reconstruction^2-4.

Several options are available for treating these injuries, and the simplest method is always preferred^1,5. The chosen reconstruction strategy should consider the following factors: injury (location, size), donor area, patient (clinical history), and surgery (surgeon’s experience, hospital structure)¹.

Among the options available for surgical repair, the use of the reverse sural flap of the fasciosubcutaneous pedicle^3,6,7 or adipofascial reverse flap has been reported in the literature as a viable option since more than 20 years^7,8; however, this approach has been little studied compared with other techniques. The main advantages of using the proposed technique are the simple and fast execution; sufficient and reliable vascularization; and low morbidity of the donor site, which has an excellent rotation arc⁹, making this strategy useful in several cases.

The objectives of this study were to present the results of surgical treatment of a complex injury, involving exposure of the Achilles tendon, in the lower third of the leg using the reverse sural flap of the fasciosubcutaneous pedicle concomitantly with total skin grafting and to discuss the advantages of the procedure as well as other surgical alternatives.

CASE REPORT

A.D., a 28-year-old male Caucasian patient without comorbidities, presented with a necrotic injury (6.0 × 4.0 cm²) with Achilles tendon exposure in the lower third of his right leg after surgical repair of Achilles tendon rupture that had occurred during an automobile accident. On day 30 after surgery, the patient was referred to our plastic surgery service and underwent surgical debridement (Figure 1).

Figure 1 - Preoperative result. A: Result before debridement; B: Result after 15 days of debridement.

Figure 1 - Preoperative result. A: Result before debridement; B: Result after 15 days of debridement.

The complex injury was treated 15 days after debridement. With the patient in the prone position and under spinal anesthesia, the operative site in the calf region of the right lower limb was demarcated. The necrotic injury in the lower third of the leg was repaired using the reverse sural flap of the fasciosubcutaneous pedicle, which was fixed without tension, concomitantly with total skin grafting. The skin graft was removed from the ipsilateral popliteal region during flap preparation (Figures 2 and 3).

Figure 2 - Intraoperative preparation of the reverse sural flap using the fasciosubcutaneous pedicle. A: Demarcation of the operative site; B: Extensive cutaneous detachment; C: Dissection of the fascia of the sural muscle and rotation of the flap 180 degrees on the axis of the fasciosubcutaneous pedicle, covering the exposed area; D: Fixation of the flap in the recipient area and use of a Penrose drain to collect the drainage; E: Immediate postoperative result after performing total skin grafting at the same time.

Figure 2 - Intraoperative preparation of the reverse sural flap using the fasciosubcutaneous pedicle. A: Demarcation of the operative site; B: Extensive cutaneous detachment; C: Dissection of the fascia of the sural muscle and rotation of the flap 180 degrees on the axis of the fasciosubcutaneous pedicle, covering the exposed area; D: Fixation of the flap in the recipient area and use of a Penrose drain to collect the drainage; E: Immediate postoperative result after performing total skin grafting at the same time.

Figure 3 - Intraoperative preparation of the reverse sural flap using the fasciosubcutaneous pedicle. A: Demarcation of the operative site; B: Extensive cutaneous detachment; C: Dissection of the fascia of the sural muscle and rotation of the flap 180 degrees on the axis of the fasciosubcutaneous pedicle, covering the exposed area; D: Fixation of the flap in the recipient area and use of a Penrose drain to collect the drainage; E: Immediate postoperative result after performing total skin grafting at the same time.

Figure 3 - Intraoperative preparation of the reverse sural flap using the fasciosubcutaneous pedicle. A: Demarcation of the operative site; B: Extensive cutaneous detachment; C: Dissection of the fascia of the sural muscle and rotation of the flap 180 degrees on the axis of the fasciosubcutaneous pedicle, covering the exposed area; D: Fixation of the flap in the recipient area and use of a Penrose drain to collect the drainage; E: Immediate postoperative result after performing total skin grafting at the same time.

The surgical procedure lasted 90 min and was uneventful. The patient was discharged eight hours after the procedure, without plaster immobilization and required only occlusive dressings. The patient had no relevant motor and sensory deficits or pain and was instructed to avoid walking with a full load for one week. The postoperative period was uneventful, and only occlusive dressings were required. The lesion gradually healed (Figure 4).

Figure 4 - Postoperative result. A: 60 days; B: 120 days; C: 150 days; D: 180 days postoperatively.

Figure 4 - Postoperative result. A: 60 days; B: 120 days; C: 150 days; D: 180 days postoperatively.

DISCUSSION

The need for more effective, easier, and reliable surgical procedures, especially for treating injuries in the distal third of the leg, has been reported by several studies over the years^1,7.

Considering the increase in patients’ demands for better surgical outcomes, assessment of the quality of the achieved result has been gaining prominence in the literature and has stimulated more discussions among plastic surgeons and patients^2-4.

The reverse sural flap of the fasciosubcutaneous pedicle and the reverse adipofascial flap receive blood supply from the cutaneous perforating branches of the fibular and posterior tibial arteries¹. These flaps preserve the sensory innervation of the saphenous, superficial fibular, and sural nerves because only a thin region of the subcutaneous tissue is left under the dermis to avoid injury to the subdermal plexus of the donor region, whereas most of the subcutaneous tissue that is easily dissected in a surgical plane guarantees the viability of the flap, facilitating easy rotation on its axis without the need to release the pedicle to repair the margins in a second surgical procedure, as is the case with the fasciocutaneous flap², maintaining low morbidity and satisfactory results without functional sequelae^1,6,8.

The reverse sural flap of the neurocutaneous pedicle, initially described by Masquelet et al. (1994), is one of the most common options² for treating injuries such as those reported in this case. However, this surgical approach is criticized because of the loss of cutaneous sensitivity and unsightly scarring of the donor area².

Perforating flaps have also been gaining prominence in recent years. This technique was first described by Donski & Fogdestam (1983)⁵ but has disadvantages, including the considerable variability in the diameter and position of the perforating vessels.

The use of microsurgical reconstructions, such as the free myocutaneous flap of the latissimus dorsi, among other options that have emerged in the past few years as surgical alternatives for treating injuries in critical areas,^2,3 is usually reserved for larger injuries and requires good hospital infrastructure and highly trained staff.

Some options commonly used for treating complex injuries of the lower limbs have been described in a literature review published in the Brazilian Journal of Plastic Surgery in January 2017¹⁰. However, the flap used in the present study was not mentioned in that review.

Considering data from previous studies and this study, the use of the reverse sural flap of the fasciosubcutaneous pedicle or reverse adipofascial flap has a good prognosis. The use of these flaps was effective and safe, had excellent esthetic and functional results, and did not cause relapses during the evaluation period. Therefore, these flaps deserve more attention from plastic surgeons because of their high clinical potential, especially compared with other techniques used routinely.

CONCLUSION

The use of the reverse sural flap of the fasciosubcutaneous pedicle concomitantly with total skin grafting was found to be a good option with a satisfactory result for the surgical treatment of a complex injury due to Achilles tendon rupture in the lower third of the leg.