Reconstruction of Scalp and Forehead Defects
Section snippets
Anatomy of the scalp and forehead
Knowledge of the anatomy of the scalp and forehead will assist the reconstructive surgeon in the choice of local flap options as well as choosing a potential microsurgical recipient vessels site if needed. Furthermore, such knowledge is important for understanding, evaluating and adequately reconstructing complex full thickness calvarial defects.
The anatomy of the scalp and that of the forehead are very similar and, therefore, the two are often considered a single unit. The main difference
Goals and Priorities
When considering a defect or deformity, the initial question is: what are the goals and priorities? Recognizing that the easiest way to close a defect may not be the best or ideal way, one must ask: is the goal to simply close a wound or to reconstruct the part to obtain the best aesthetic and functional outcome possible? (Table 1).
Considerations include: location and size of defect; depth of defect and surrounding tissue quality; age and health of patient; and status of disease (control or
Primary Closure
Frequently, post-traumatic wounds have the appearance of tissue loss but, on careful inspection, are found to not be missing any tissue. These wounds can usually be closed directly if minimal tissue needs to be debrided (Fig 1). If the defect is smaller then 3 cm in diameter, primary closure with undermining can usually be performed.17 There may be limitations of that approach based on the surrounding tissue quality or exposure of vital structures. Local advancement flaps, undermining the
Local flap reconstruction within the same aesthetic unit
Tissue from the same aesthetic unit provides the best cosmetic results in reconstructing a defect. There are no separate aesthetic units of the scalp, but there is a clear distinction between the hair-bearing scalp and the aesthetic unit of the forehead. When utilizing scalp flaps, consideration needs to be given to the direction of hair growth. A swatch of hair growing in the wrong direction can mar an otherwise excellent reconstruction. The thick, unyielding characteristics of scalp and
Crane Principle and Island Pedicle Flaps
Reconstruction of defects with flaps from outside the aesthetic unit in which the defect is located is often required if there is not enough laxity of tissue within the same aesthetic unit. One of the techniques used crossing the aesthetic units of the scalp and the forehead is the crane principle. In 1969, Millard described the crane principle in which a flap is used as an engineering crane to lift and transport subcutaneous tissue from one area to deposit in another; the pedicle and overlying
Muscle, Musculocutaneous and Fasciocutaneous Flaps
Many reconstructive surgeons will choose to close large scalp and forehead wounds with a free-tissue transfer, even if one could technically be closed with a distant pedicle flap. Their reasoning is that free tissue transfers provides the most robust vascular supply of the flap to the wound, compared to the distal portion of the pedicle flap (which frequently has less robust vascularity). In addition, it is usually easier to inset and tailor free-tissue transfers then pedicle flaps, thereby
Future directions
The future directions of reconstruction are tissue engineering and composite tissue allograft transfer (CTA). Although genetically engineered growth of hair follicles has only been demonstrated in an animal model,59 CTA of other facial parts have been clinically performed in humans.60, 61, 62, 63, 64 Because the standard methods of scalp and forehead coverage and reconstruction are usually able to obtain an acceptable aesthetic result (albeit sometimes only with a wig), isolated scalp and
Summary
As mentioned, reconstruction of scalp and forehead defects is a complex field with a broad variety of reconstructive options. It is important to determine goals and priorities. Is the goal to close the wound or to reconstruct the defect? What is the easiest way to close the defect versus what is the best way to close the defect?
Defining those initial goals and choosing a reconstructive option is influenced by size and location of the defect, etiology and depth of the defect, surrounding tissue
Acknowledgments
The authors want to acknowledge their Neurosurgery and Head and Neck Surgery colleagues as well as all the residents in Plastic and Reconstructive Surgery at the University of Chicago who were all crucial in the care of the patients presented in this manuscript.
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