Maya Ellison
Skin grafting is a type of surgery where healthy skin from one part of the body is transplanted to cover damaged or missing skin. Skin grafting is commonly used to treat skin loss or damage resulting from burns, injuries, wounds, disease, infection, or surgery to remove skin cancer. There are two main types of skin grafts: split-thickness skin grafts (STSG) and full-thickness skin grafts (FTSG). STSG involves removing the epidermis (top layer of skin) and part of the dermis (second layer), while FTSG involves removing and transplanting both the entire epidermis and dermis. Epidermal grafting (EG) is an emerging alternative to STSG that harvests only the epidermal layer of the skin, resulting in minimal donor site morbidity and reduced pain. This procedure can be performed in an outpatient setting and has been shown to achieve complete wound healing in two-thirds of selected patients.
Characteristics and Values of Plastic Epidermal Grafts
| Characteristics | Values |
|---|---|
| Definition | A type of surgery where healthy skin is taken from a donor site and transplanted to cover damaged or missing skin. |
| Use Cases | Skin grafts are used to cover skin that has been damaged or is missing due to burns, injuries, wounds, disease, infection, or surgery to remove skin cancer. |
| Types | Split-thickness skin graft (STSG), full-thickness skin graft (FTSG), composite graft, and autograft (using the patient's own skin). |
| Donor Site | The donor site is the area from which healthy skin is removed. This is typically the thigh, bottom, belly, back, buttock, inner thigh, groin, arm, or collarbone area. |
| Healing Time | Donor sites for partial-thickness skin grafts take about 2 weeks to heal, while full-thickness skin grafts take about 5-10 days due to their smaller size and closure with stitches. |
| Anaesthesia | General or local anaesthesia is administered depending on the size and location of the affected area. |
| Attachment Method | The graft is held in place using stitches, staples, clips, or special glue. |
| Dressing | The grafted area is covered with a sterile dressing for 5-7 days until it connects with the surrounding blood supply. |
| Blood Supply | Full-thickness grafts may require more time to pick up a new blood supply due to their thickness. |
| Pain | Epidermal grafting is relatively pain-free compared to other methods, with minimal donor site morbidity. |
| Scarring | Epidermal grafting leaves a scar-free donor site, while split-thickness skin grafts may result in scarring. |
| Wound Healing | Epidermal grafting promotes wound healing by expressing growth factors and encouraging keratinocyte migration from the wound edge. |
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What You'll Learn
Split-thickness skin grafting (SSG)
Skin grafting is a type of surgery that involves taking healthy skin from one part of the body and transplanting it to cover skin that is damaged, missing, or cannot heal on its own. Skin loss or damage can result from burns, injuries, wounds, disease, infection, or surgery to remove skin cancer.
The lateral thigh is a common donor site for SSG as it is accessible, has a large surface area, and heals quickly without significant complications. The trunk is another common donor site. The harvested graft can be expanded by meshing to increase the surface area or left intact. Meshing provides space for fluid to drain, minimising hematoma and seroma formation, but meshed grafts are more fragile and take longer to heal. In contrast, unmeshed grafts are more durable and pliable, provide better cosmesis, and heal faster.
The choice between full- and split-thickness grafting depends on wound condition, location, thickness, size, and aesthetic concerns. Split-thickness skin grafts (STSGs) require less ideal conditions for survival and have a broader range of applications than full-thickness skin grafts (FTSGs). STSGs are used to resurface large wounds, line cavities, resurface mucosal deficits, close flap donor sites, and resurface muscle flaps. FTSGs are chosen for parts of the body that are not usually covered by clothing, such as the face, as they provide a better thickness match and superior cosmetic and functional results.
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Epidermal grafting (EG)
EG is a promising option for wound closure, as it does not leave behind a second wound at the donor site, which may be painful and take longer to heal than the graft site. The donor site in EG heals within 3 to 5 days and is covered with a sterile dressing to protect it from infection.
EG is performed using an automated epidermal harvesting system, such as the CelluTome Epidermal Harvesting System, which produces an array of epidermal micro-grafts. This system has been noted to achieve complete wound healing in two-thirds of selected patients with minimal or no pain and a scar-free donor site.
The ability to perform EG in an outpatient setting eliminates the need for a theatre space and a hospital bed, potentially improving patient satisfaction. However, it is not yet known if EG is as effective as the current standard of care for wound closure, split-thickness skin grafting (SSG).
Randomized controlled trials, such as EPIGRAAFT, are being conducted to compare the efficacy and wound-healing mechanisms of EG and SSG. EG is hypothesized to promote wound healing by expressing growth factors and encouraging keratinocyte migration from the wound edge.
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Autologous skin grafting
Skin grafting is a type of surgery that involves removing healthy skin from one part of the body and transplanting it to cover or replace skin that is damaged, missing, or has been removed during surgery. Skin loss or damage can result from burns, injuries, wounds, disease, or infection.
Autologous skin grafts, or autografts, are skin grafts harvested from one part of the patient's body and transferred to another on the same individual. They are considered the standard of care for wound repair and can be full-thickness (FTSG) or split-thickness (STSG). Both these grafts require tissue donation from healthy skin, which may be limited in the case of extensive injury and could further predispose the patient to infection or blood loss. FTSG procedures require more healing time than STSG because the transplanted skin is thicker. Providers may choose FTSG for a part of the body that is not usually covered by clothing, such as the face. For FTSG, providers often remove healthy skin from the groin, arm, or collarbone area and then close the donor wound right away.
Epidermal grafting (EG) is an emerging method of autologous skin grafting that harvests only the epidermal layer of the skin from the donor site by applying gentle heat and continuous negative pressure. This procedure has minimal donor site morbidity and is relatively pain-free, allowing autologous skin grafting in an outpatient setting. EG has been shown to be effective in achieving complete wound healing with minimal or no pain and no scarring at the donor site.
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Donor site
A skin graft is a surgical procedure in which a piece of skin is transplanted from one area of the body to another. Skin grafts are used to cover damaged or missing skin, often caused by burns, injuries, wounds, disease, or infection. They are also used following surgery to remove skin cancer.
The donor site is the area of the body from which the healthy skin is removed. Typically, the donor site is an area of the body that is unaffected by the issue being treated. For example, skin may be taken from the thigh, bottom, belly, or back. The donor site is typically closed right away, and it normally heals on its own within 1-2 weeks.
When choosing the donor site, providers consider the tone and texture of the skin, aiming to match the graft site as closely as possible. The donor site and the graft site are both monitored after surgery to ensure proper healing and to look for signs of infection.
The recovery time after skin graft surgery depends on the overall health of the patient, the size and type of skin graft, and the location of the graft site. Patients may experience some pain, bleeding, or pus, and should monitor for signs of infection, such as fever. It is important to follow the provider's instructions after surgery, including wearing a cover or dressing over the wounds as directed.
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Wound healing
The process of wound healing through epidermal grafting involves several key steps. Firstly, the wound bed is prepared to ensure a healthy environment for grafting. This includes negative pressure wound therapy (NPWT) or appropriate wound dressings, and wound swabs to prevent bacterial growth. Once the wound bed is ready, the donor site is selected, typically the thigh, and the epidermal graft is harvested using a specialised system like the CelluTome Epidermal Harvesting System. This system automates the process, producing epidermal micro-grafts.
After the graft is harvested, it is transplanted onto the recipient site, covering the damaged or missing skin. Within a few days, the grafted skin initiates the formation of blood vessels and integrates with the surrounding skin. The donor site, where the healthy skin was removed, also undergoes its own healing process. This typically takes around 1-2 weeks for full recovery.
The efficacy of epidermal grafting in wound healing has been evaluated in randomised controlled trials, such as the EPIGRAAFT study. This research aims to compare the outcomes of epidermal grafting (EG) and split-thickness skin grafting (SSG). Initial findings suggest that EG achieves complete wound healing in two-thirds of patients, with minimal or no pain and no scarring at the donor site. The ability to perform EG in outpatient settings also enhances patient satisfaction.
However, it is important to acknowledge that wound healing is a dynamic process influenced by various factors, including the size and location of the wound, the overall health of the patient, and their adherence to post-operative care instructions. Additionally, while epidermal grafting offers advantages, it may not always be the most suitable option for every patient or wound type. In some cases, other grafting techniques, such as full-thickness skin grafts or composite grafts, may be recommended based on the specific circumstances.
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Frequently asked questions
A plastic epidermal graft is a type of surgery that involves removing healthy skin from one part of the body and transplanting it to another to cover damaged or missing skin.
The procedure involves harvesting only the epidermal layer of the skin from the donor site by applying gentle heat and continuous negative pressure to raise blisters. The graft is then carefully spread on the bare area where it is being transplanted and held in place by gentle pressure from a well-padded dressing, or by staples or stitches.
The donor site can be any area of the body but is typically an area that is hidden by clothes, such as the buttock, back, thigh, belly, or arm. The site may be chosen based on the size and location of the needed skin.
The recovery time varies depending on the overall health of the patient, the size of the graft, and the technique used. The donor site of a partial thickness skin graft usually takes about 2 weeks to heal, while a full-thickness graft takes about 5 to 10 days due to its smaller size. The grafted skin may take a year or two to fully settle, and the final colour may be slightly different from the surrounding skin.
