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Plast Aesthet Res 2018;5:40.10.20517/2347-9264.2018.40© The Author(s) 2018.
Open AccessOriginal Article

Applying skin graft sheets transversely to manage burn patients

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1Cosmetic and Reconstructive Plastic Surgeon, Burn Unit Simón Bolívar North Subnetwork E.S.E., Bogotá D.C. 110221, Colombia.

2Department of Plastic Surgery, University of Sinú, Cartagena 110231, Colombia.

Correspondence Address: Dr. Ricardo Madiedo, Cosmetic and Reconstructive Plastic Surgeon, Burn Unit Simón Bolívar North Subnetwork E.S.E., Bogotá D.C. 110221, Colombia. E-mail: madiedor@hotmail.com

    Science Editor: Raúl González-García | Copy Editor: Cui Yu | Production Editor: Zhong-Yu Guo
    ...

    © The Author(s) 2018. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, sharing, adaptation, distribution and reproduction in any medium or format, for any purpose, even commercially, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

    Abstract

    Aim: The aim of this study is to determine whether the split-thickness grafts should be applied to the treatment of burn patients, parallel to the relaxed skin tension lines as described by Kraissl, which would help scarring and reduce the development of abnormal scars.

    Methods: A descriptive longitudinal case series study was conducted at the Burn Unit of Health Services Simón Bolívar North Subnetwork E.S.E. of the Secretariat of Health in Bogotá, Colombia, from 1 Jan 2016 to 31 Dec 2017. A total of 138 burn patients exhibiting deep partial- or full-thickness burns involving different body regions, except for the face, were included. Burns required split-thickness skin grafts for definite wound coverage, and these were applied transversely following relaxed skin tension lines. Results were assessed according to the Vancouver Scar Scale (VSS) during a 12-month follow-up. Within this period, function was assessed by the rehabilitation unit, after which physical and functional activities were determined and splinting was implemented, as per rehabilitation protocols, to control and improve functional and physical outcomes.

    Results: Based on the VSS, most patients (134) had a mean score of 5 (range: 3-7), resulting in clinically acceptable scars with no functional limitations.

    Conclusion: Applying split-thickness skin grafts to cover deep partial- or full-thickness burns along relaxed skin tension lines, such as Kraissl’s lines, seems to reduce wound tension force, which constitutes one of the most predominant factors contributing to the development of abnormal scars and functional sequelae.

    Introduction

    Burns are considered a public health problem worldwide due to their associated high mortality rates as well as their great morbidity incidence and functional impairment[1-3]. Severe scars and late contractures occurring after the placement of split-thickness autografts during treatment persist as some of the most relevant and frustrating sequelae in patients with deep burns[4,5]. Not only do they result in deformities and functional impairments, but they may also affect the patient’s esthetic appearance, which is distinguishable in burn patients[6,7]. These sequelae usually cause prolonged disability, job abandonment, and high costs to the health system[8,9].

    Generally, multiple reconstructive interventions are required, including Z-plasties, contracture release, skin grafts, flaps, tissue expanders, skin substitutes, and a great variety of auxiliary treatments, in the attempt to improve and preclude recurrence[10-13]. Furthermore, lengthened rehabilitation interventions are required in addition to multiple complementary elements, such as Lycra garments, silicone gel sheets, thermoplastic masks, prolonged immobilization, orthosis, moisturizing lotions, lubricants, corticosteroid injections, and even radiotherapy. Varying results obtained are poor and disheartening in some cases[14-16].

    In the literature, it is widely reported that the use of full-thickness skin grafts exhibit better texture and color, and they significantly reduce the occurrence of contractures and scarring sequelae. However, the availability of donor sites that will enable the use of such grafts is limited, and thus, the application of split-thickness skin grafts becomes necessary[17,18]. Skin substitutes of human or animal origin or synthetic substitutes may be an alternative for reconstructing the dermis, reducing the incidence of retraction from the use of split-thickness skin grafts. These substitutes allow to compensate for the lack of donor sites of full-thickness skin grafts, bringing satisfactory results. Nonetheless, the limited availability of these dermal matrices and their elevated costs for most burn units in developing countries have hindered their use[19,20].

    Traction and tension forces on scars also play an important role during the formation of optimal scars. These forces are associated with the orientation of collagen fibers in the lower dermis and are essential for correcting hypertrophic scars, particularly when Z-plasties are performed to redirect scars into the relaxed skin tension lines, i.e., Langer’s lines[21,22]. Nevertheless, Langer[21] studied these relaxed skin tension lines in cadavers, whereas Kraissl’s lines were defined in living individuals under no traumatic procedures[23]. In this way, Kraissl’s lines are found to be more dynamic and to correlate with wrinkle lines during muscle contraction, making them more accurate than Langer’s lines. These lines are disposed transversely, run perpendicular to muscle action, and they are vital in normal scarring[23,24]. In the light of the foregoing, we have suggested that placing split-thickness skin grafts transversely, following Kraissl’s lines, on exposed areas resulting from burns may improve the esthetic and definitive functional outcomes in burn patients. This study aimed at describing patient evolution with split-thickness skin grafts applied by following Kraissl’s lines during a 12-month period. To evaluate the functional and esthetic outcomes of scars in patients who underwent split-thickness skin grafting transversely based on Kraissl’s lines to cover deep burns.

    Methods

    A descriptive longitudinal case series study was conducted at the Burn Unit of Health Services (HSU) Simón Bolívar North Subnetwork E.S.E. of the Secretariat of Health in Bogotá, Colombia, from 1 Jan 2016 to 31 Dec 2017. The study was approved by the Institutional Ethics Committee, and was based on the ethical principles contained in the declaration of Helsinki.

    The study included 138 patients with a mean age of 24.5 years (range: 7-74 years). Of this group, most subjects were men (n = 96, 70%), with a mean age of 24.5 years (range: 7-74 years). These injuries required definitive coverage, involved any part of the body, with the exception of the face, and were classified as superficial (affecting only the epidermis), partial-thickness (until papillary dermis layer) or full-thickness (complete dermis and underlying tissue).

    Patients were asked to sign an informed consent form to participate in the study and have their photos taken. Patients showing additional comorbidities that could affect scarring, including malnutrition, high blood pressure, diabetes mellitus, and coagulation disorders, were excluded. Patients having severe mental disorders or exposed areas not suitable for graft coverage, including hypertrophic granulation tissues, edematous or pale tissues, or the presence of discharge, were also excluded.

    Procedures

    Once the informed consent form was signed, the procedure was performed in operating rooms after the administration of general anesthesia, patients were washed with water and chlorhexidine soap. Granulation tissue curettage was executed for full removal, and wet compresses diluted in 500 cc of 0.9% saline were applied, along with the use of a 1-mg adrenaline ampoule, to achieve hemostasis. In case bleeding was not controlled, hemostasis was ensured by electrocautery. Subsequently, from the available donor sites, such as the lower limbs, back or scalp, a split-thickness skin graft (between 0.25 mm and 0.30 mm) was harvested using an electric dermatome. Following this, bupivacaine 0.25% with epinephrine at a dose of 2 mg/kg was administered to manage postoperative pain at donor site. Upon verifying hemostasis at receptor site, the graft was placed transversely in sheets, without expansion or meshing. Incisions for drainage were made, while ensuring that no exposed spaces were left in between each sheet. Suture immobilization remained at the discretion of the surgeon, but it was usually done on pediatric patients and at flexion creases sites. Next, the graft receptor site was covered with nitrofurazone-impregnated gauzes and cotton padding bandages as secondary dressing. Flexion areas were applied plaster splint intraoperatively. The first cleaning and dressing session took place at postoperative day 5, and from then on, every third day until hospital discharge. Postoperative monitoring varied in frequency, based on the surgeon’s judgment, until postoperative month 12. The same two surgeons performed the monitoring.

    On admission, all patients were evaluated and managed through physical and occupational therapies. Based on the reported findings, the rehabilitation team planned activities aimed at lowering edema, reducing pain, improving ROM, controlling positioning, and recovering sensitivity and strength, to promote the functionality of affected areas and independence of physical and instrumental ADL. Rehabilitation treatment was suspended immediately after surgery and was resumed at day 5 upon verification by the surgeon that there was proper graft integration. Once the physical and occupational therapies were resumed, they were continued during hospital admission and 3 months postoperatively (outpatient), through physical conditioning, digital pressure on the scar, orthotic management, Lycra garments, silicone, moisturizers, and lubricants. The scars had no medication infiltrated.

    Scarring evaluation

    The Vancouver Scar Scale (VSS) was used as follows: pigmentation and vascularity was examined visually, pliability was assessed by palpation and digital pressure, and height/thickness was measured with a millimeter ruler[25]. Overall scores were categorized in three groups according to the following characteristics: (1) mild scar (score 0-3): characterized by a flat scar having a similar appearance to normal skin. It is supple and elastic, and has a few elements of pigmentation or vascularization; (2) moderate scar (score 4-7): characterized by a fairly thick and wide scar or a slightly wide and raised scar. Pink to red pigmentation changes may be observed, but there is yielding. Some areas may be fragile and less resistant; and (3) severe scar (score 8-13): characterized by clear signs of hypertrophy or keloid. The scar has a red to purple pigmentation, and it is unstable, raised, bulky, firm and indurated. Contractures and retractions may be present. Results were evaluated by a team of experts consisting of two surgeons, who performed the procedures, and a burn specialist.

    Statistical analysis

    The socio-demographic variables age and sex were registered. Other clinical characteristics were registered as well, including total burned body surface area using the Lund and Browder chart[26], burn depth, compromised body area, eschar removal prior to applying definitive autografts, number of days since admission until definitive coverage, grafted anatomical area, donor sites, graft thickness, and complications. Scars were assessed at month 1 and at month 12 based on the VSS. For qualitative variables, frequencies and percentages were used, whereas for quantitative variables, mean, median and range were preferred. Microsoft Excel® was used.

    Results

    A total of 138 patients showing deep burns were admitted. They required definitive coverage with split-thickness skin grafts, which were placed transversely. Of this group, most subjects were men [Figure 1], with a mean age of 24.5 years (range: 7-74 years) [Figure 2]. Among injury mechanisms, the most common etiologic factor was flame with 40% (n = 55), followed by electricity 13.7% (n = 19), scald 12.3% (n = 17), chemical agents 13% (n = 18), and other 21% (n = 29) [Table 1].

    Table 1

    Socio-demographic variables and clinical characteristics of burns

    VariablesFrequencyPercentage
    Male9670
    Female4230
    Injury mechanism
    Flame5540
    Electricity1913.7
    Scald1712.3
    Deep partial-thickness burn5237.7
    Full-thickness burn2820.3
    Mixed burn (deep partial- and full-thickness)2921
    MedianRange
    Age24.57-74
    Burned body surface area24.342-66

    Figure 1. Distribution by gender of the 138 patients whose burns were treated with transverse split-thickness skin grafts. HSU: Unit of Health Services

    Figure 2. Distribution by age group. HSU: Unit of Health Services

    The mean extension of total compromised body surface area was 24.34% (range: 2%-66%). Concerning burn depth, 52 (37.7%) patients exhibited partial-thickness burns, 28 (20.3%) patients showed full-thickness burns, and 29 (21%) patients had mixed burns, i.e., both deep partial- and full-thickness burns. The most common compromised anatomical areas were the upper limbs accounting for 77.4% (n = 89), face 46% (n = 53), trunk 40% (n = 46), lower limbs 39.1% (n = 45), and neck 21% (n = 29). Mean hospital stay consisted of 16 days (range: 8-100 days).

    Among the 138 patients, 106 (76.8%) patients underwent a single early eschar removal procedure by tangential excision, 19 (13.7%) patients required 2 escharectomies, 6 (4.3%) patients 3 escharectomies, and 7 (5.0%) patients 4 escharectomies. Patients having full-thickness burns underwent more escharectomies. In 26 (18.8%) patients, the escharectomy area was covered temporarily with skin allografts prior to carrying out the definitive coverage with split-thickness skin autografts, as to promote the formation of granulation tissue suitable for grafts.

    In all, 46 (33.3%) patients required several grafting sessions, involving 2-5 additional procedures. These subjects exhibited burns > 20% of extension, full-thickness burns, and limited donor sites. Ten (7.2%) of the 138 patients developed infection, resulting in full or partial graft failure. Reported cultures included Acinetobacter baumannii (n = 4, 2.9%), Pseudomonas aeruginosa (n = 4, 2.9%), and Klebsiella pneumoniae (n = 2, 1.4%). No case of mortality was reported. Initial scars were assessed at first postoperative month, and definitive outcomes were determined at month 12 based on the VSS.

    Of the 138 patients, 130 (94.2%) showed mild scars (score ≤ 3 in VSS). These were flat and had a similar appearance to normal skin; they were supple and elastic, and had a few elements of pigmentation (hypopigmentation and hyperpigmentation) or vascularization (pink) [Figures 3-6]. Four (2.9%) patients showed moderate scars (score 4-7) having a < 5 mm thickness and width, and a < 2 mm height. There were some changes in pigmentation and vascularization (pink to slight red); nonetheless, there was yielding and no evidence of rigidity or functional limitations, although some developed fragile areas with low resistance. Four (2.9%) patients showed severe scars (score ≥ 8) having clear signs of hypertrophy or keloid at 12-month follow-up. There was some degree of contracture and functional limitations, particularly in flexion creases sites. These 4 (2.9%) patients developed infection in the grafted areas, and they required surgical correction through contracture release and the application of new grafts [Table 2].

    Figure 3. A 16-year-old female patient with a full-thickness flame burn to the left upper limb. A: Exposed area suitable for grafts; B: coverage with split-thickness skin grafts placed transversely; C: appearance by postoperative day 45; D: appearance after 6 months, with no functional limitations

    Figure 4. A 24-year-old male patient with a full-thickness chemical burn (sulfuric acid) to the left upper limb, involving creases. A: Initial appearance, with an adhered and hard eschar; B: formation of a uniform and non-hypertrophic granulation tissue. It was red and had no discharge following two escharectomies. It was covered temporarily with skin allografts; C: placement of split-thickness skin grafts transversely soon after surgery; D: appearance at postoperative month 1

    Figure 5. A: Thirty-two-year-old female patient with a deep partial-thickness flame burn to both lower limbs, who underwent eschar removal by tangential excision; B: placement of split-thickness skin grafts transversely; C: results at postoperative year 1. No evidence of contracture, and both texture and color are adequate

    Figure 6. A: Twenty-eight-year-old male patient with a full-thickness flame burn of 18% total body surface area to back and gluteal region; B: appearance following 3 escharectomies performed by electric dermatome, and temporary coverage with skin allografts; C: intraoperative appearance after placing split-thickness skin grafts transversely; D: results at postoperative month 12

    Table 2

    Classification of results based on the Vancouver Scar Scale

    VariableNumber of patientsPercentage
    Mild scar (Vancouver score < 3)13094.2%
    Moderate scar (Vancouver score 4-7)42.89%
    Severe scar (Vancouver score ≥ 8)42.89%

    In terms of rehabilitation, upon admission, all patients had developed some degree of edema in their upper and lower limbs. They also reported pain as per visual analog scale (VAS) at rest, which increased during muscle activity. Functional joint limitation was directly associated with skin involvement of finger and wrist joints, pain degree, and presence and severity of edema, resulting in functional limitation of the involved joint. Sensitivity exhibited mixed impairment, with areas of hyperesthesia associated with superficial burns and areas of hypoesthesia associated with deep burns, as well as non-painful areas corresponding to full-thickness burns. Patients showed decrease in strength, range of motion (ROM) impairment and activities of daily living (ADLs) limitations. This resulted in weakened or non-functional upper and lower limbs, making patients highly dependent.

    At week 4 postoperatively, patients having a VSS score below 7 showed resolution of edema, a decrease to 0 for pain at rest and during activity (VAS), and gradual improvement of sensitivity during the following 6 months, as deep sensitivity was regained. There was an increase in strength, as well as greater gains in ROM and complete resumption of instrumental and non-instrumental ADLs. The 4 patients who developed infection and exhibited graft loss in affected areas showed scarring disorders, with signs of hypertrophic scars and keloids, cutaneous and subcutaneous contractures, and fascia contracture. None of them presented ligament or muscle contractures, or functional limitations of involved joints; however, they reported persistence of pain at rest and during activity, decreased joint ROM, decrease in strength, and ADLs limitations, which improved at week 6 following surgical contracture release by placing new grafts and restarting rehabilitation.

    Discussion

    In the researched literature, we did not find studies evaluating the evolution of split-thickness skin graft sheets in burn patients while taking into account their placement orientation. Conversely, abnormal scarring and joint contractures following deep burns have been widely reported. In a multicenter study involving 1865 patients, Goverman et al.[27] described as risk factors and predictors of contracture development male sex, Hispanic ethnicity, medical problems, neuropathy, total body surface area (TBSA) affected by partial-thickness burns, TBSA grafted with split-thickness grafts, and prolonged hospital stay. According to their findings, the most common postburn morbidity was joint contracture, which occurred despite aggressive therapeutic interventions at both occupational and physical levels (positioning and splinting), affecting quality of life and ADLs. Their surgical management required skin grafts, as well as local and distant flaps. The most frequently contracted joint was the shoulder with 23.0%, followed by the elbow (19.9%), the ankle (13.6%), and the knee (13.4%). Schneider et al.[4] reported among 985 patients a joint contracture prevalence of 39% (n = 381), with the shoulder, the elbow, and the knee being the most frequently contracted joints. In total, 39% of all cases developed at least one joint contracture. In 2003, Kowalske et al.[28] in a study involving 1478 patients with major burns reported a joint contracture prevalence of 43% (n = 641). Furthermore, in 2016 Oosterwijk et al.[29] presented a systematic review according to which the prevalence of postburn contractures is different among studies, ranging from 38% to 54%, and contractures were most likely to develop in deep and extensive burns, as well as in the neck and upper limbs.

    In this study, we found that the transverse placement of grafts may lead to clear changes in terms of functionality and esthetics. The study sample revealed a very low incidence of contractures, adhesions, hypertrophic scars, and keloids (4/138, 2.9%), particularly in limbs, which according to the literature constitute the most commonly affected areas by scarring sequelae. We consider that the transverse placement of grafts benefits scarring by reducing both tension of muscle contraction in grafted areas and resting skin tension, as the muscle action generated by Kraissl’s lines correspond to the relaxed skin tension lines, which follow wrinkles and skin movement during muscle contraction, mainly in the neck, trunk, and limbs. In this way, such lines should be considered during the planning and placement of grafts. Unlike Goverman et al.[27], we believe that a multidisciplinary treatment with rehabilitation upon patient admission greatly influences prevention control of functional and scarring disorders. These observations are preliminary, and therefore, not conclusive, as they require further studies allowing comparisons with a control group.

    Nevertheless, surgeons usually determine how to place split-thickness skin grafts on exposed areas, relying on the orientation that will allow the operator to cover the greatest exposed tissue area with the obtained graft. In this sense, the orientation of those forces resulting in the underlying muscle tissue contraction of the area to be grafted are not taken into consideration. Generally, the skin is under constant tension, which varies depending on the area. This static tension follows predictable patterns, and it is defined by Kraissl’s lines. The movement of joints and muscles causes dynamic tension, and so placing grafts perpendicular to Kraissl’s lines creates more tension, resulting in wider and hypertrophic scars that may even progress to severe contractures and functional impairments, especially in the limbs and neck.

    Infection processes in burn patients continue to be a great public health problem associated primarily with an increase in mortality and morbidity, hospital stay, procedures, and costs. In our study, the occurrence of infection caused full or partial graft failure, thereby increasing the number of surgical procedures and prolonging hospital stay, as exposed areas required new grafts. Four of these patients obtained a score of ≥ 8 in the VSS, attributable to a more active inflammatory process, increased fibrosis, prompted formation of hypertrophic scars, and some degree of contracture with functional limitations of the limbs. This sample includes patients of all ages, ranging from 1 to 80 years, having extensions of 3-66. Nevertheless, results did not vary based on age or extension.

    Although not part of this study’s objectives, we noted that placing grafts transversely enables their rationalization, since they are applied from both edges at the exact size of the defect, preventing the loss of small skin fragments. Conversely, placing grafts without considering their orientation usually involves the cutting of skin segments that protrude from the wound, which results in the loss of multiple small skin fragments.

    Based on the results obtained in this study, we believe that tension forces acting on the grafted areas are essential in scarring. Orientation seems to be a relevant factor for such forces to exert more or less tension on the scar. Orienting grafts transversely, following Kraissl’s lines, lowers tension of these scarring forces, which translates into more esthetic and functional characteristics. Further studies are required engaging a larger population sample and having multicenter and controlled designs that will allow to determine and measure the static and dynamic forces involved in the scarring of skin grafts.

    In conclusion, burns are a type of trauma resulting in great morbidity rates. They compromise large portions of the skin in each patient and require a multidisciplinary and multimodal management to improve functionality and scar appearance. Abnormal scars are caused by several factors that affect scarring. One of the primary factors involves the tension exerted on the wound. Considering these relaxed skin tension lines, when applying split-thickness skin graft sheets transversely, reduces tension and minimizes the risk of developing abnormal scars, thereby achieving better esthetic results.

    Declarations

    Authors’ contributions

    Concept and design: Madiedo R

    Data acquisition: Gaviria-Castellanos JL

    Data analysis, manuscript preparation: Gaviria-Castellanos JL, Zapata-Ospina A

    Critical revision and completion of manuscript: Madiedo R, Gaviria-Castellanos JL

    Availability of data and materials

    Data were strictly obtained from medical records, in accordance with the privacy policy and code of ethics of our institute.

    Financial support and sponsorship

    None.

    Conflicts of interest

    All authors declared that there are no conflicts of interest.

    Ethical approval and consent to participate

    This study was approved by the Hospital and all authors gave their consent to participate. Ethical approval number UI-19-15.

    Consent for publication

    Not applicable.

    Copyright

    © The Author(s) 2018.

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