Menick Frederick J
Plast Reconstr Surg. 2002 May;109(6):1839-55; discussion 1856-61. doi: 10.1097/00006534-200205000-00010.
Because of its ideal color and texture, forehead skin is acknowledged as the best donor site with which to resurface the nose. However, all forehead flaps, regardless of their vascular pedicles, are thicker than normal nasal skin. Stiff and flat, they do not easily mold from a two-dimensional to a three-dimensional shape. Traditionally, the forehead is transferred in two stages. At the first stage, frontalis muscle and subcutaneous tissue are excised distally and the partially thinned flap is inset into the recipient site. At a second stage, 3 weeks later, the pedicle is divided. However, such soft-tissue "thinning" is limited, incomplete, and piecemeal. Flap necrosis and contour irregularities are especially common in smokers and in major nasal reconstructions. To overcome these problems, the technique of forehead flap transfer was modified. An extra operation was added between transfer and division.At the first stage, a full-thickness forehead flap is elevated with all its layers and is transposed without thinning except for the columellar inset. Primary cartilage grafts are placed if vascularized intranasal lining is present or restored. Importantly, at the first stage, skin grafts or a folded forehead flap can be used effectively for lining. A full-thickness skin graft will reliably survive when placed on a highly vascular bed. A full-thickness forehead flap can be folded to replace missing cover skin, with a distal extension, in continuity, to supply lining. At the second stage, 3 weeks later during an intermediate operation, the full-thickness forehead flap, now healed to its recipient bed, is physiologically delayed. Forehead skin with 3 to 4 mm of subcutaneous fat (nasal skin thickness) is elevated in the unscarred subcutaneous plane over the entire nasal inset, except for the columella. Skin grafts or folded flaps integrate into adjacent normal lining and can be completely separated from the overlying cover from which they were initially vascularized. If used, a folded forehead flap is incised free along the rim, completely separating the proximal cover flap from the distal lining extension. The underlying subcutaneous tissue, frontalis muscle, and any previously positioned cartilage grafts are now widely exposed, and excess soft tissue can be excised to carve an ideal subunit, rigid subsurface architecture. Previous primary cartilage grafts can be repositioned, sculpted, or augmented, if required. Delayed primary cartilage grafts can be placed to support lining created from a skin graft or a folded flap. The forehead cover skin (thin, supple, and conforming) is then replaced on the underlying rigid, recontoured, three-dimensional recipient bed. The pedicle is not transected. At a third stage, 3 weeks later (6 weeks after the initial transfer), the pedicle is divided. Over 10 years in 90 nasal reconstructions for partial and full-thickness defects, the three-stage forehead flap technique with an intermediate operation was used with primary and delayed primary grafts, and with intranasal lining flaps (n = 15), skin grafts (n = 11), folded forehead flaps (n = 3), turnover flaps (n = 5), prefabricated flaps (n = 4), and free flaps for lining (n = 2). Necrosis of the forehead flap did not occur. Late revisions were not required or were minor in partial defects. In full-thickness defects, a major revision and more than two minor revisions were performed in less than 5 percent of patients. Overall, the aesthetic results approached normal. The planned three-stage forehead flap technique of nasal repair with an intermediate operation (1) transfers subtle, conforming forehead skin of ideal thinness for cover, with little risk of necrosis; (2) uses primary and delayed primary grafts and permits modification of initial cartilage grafts to correct failures of design, malposition, or scar contraction before flap division; (3) creates an ideal, rigid subsurface framework of hard and soft tissue that is reflected through overlying skin and blends well into adjacent recipient tissues; (4) expands the application of lining techniques to include the use of skin grafts for lining at the first stage, or as a "salvage procedure" during the second stage, and also permits the aesthetic use of folded forehead flaps for lining; (5) ensures maximal blood supply and vascular safety to all nasal layers; (6) provides the surgeon with options to salvage reconstructive catastrophes; (7) improves the aesthetic result while decreasing the number and difficulty of revision operations and overall time for repair; and (8) emphasizes the interdependence of anatomy (cover, lining, and support) and provides insight into the nature of wound injury and repair in nasal reconstruction.
由于其理想的颜色和质地,额部皮肤被公认为是用于鼻面修复的最佳供区。然而,所有的额部皮瓣,无论其血管蒂如何,都比正常的鼻皮肤厚。它们僵硬且扁平,不容易从二维形状塑造成三维形状。传统上,额部皮瓣分两期转移。第一期,在远端切除额肌和皮下组织,将部分变薄的皮瓣植入受区。3周后的第二期,切断蒂部。然而,这种软组织“变薄”是有限的、不完整的且是零碎的。皮瓣坏死和外形不规则在吸烟者和大型鼻再造中尤为常见。为克服这些问题,对额部皮瓣转移技术进行了改良。在转移和切断之间增加了一次额外的手术。第一期,掀起包含所有层次的全厚额部皮瓣,除了鼻小柱植入部分外,不进行变薄处理而直接转移。如果存在或已恢复带血管的鼻内黏膜,则放置一期软骨移植物。重要的是,在第一期,皮片移植或折叠的额部皮瓣可有效地用于鼻内衬里。全厚皮片置于血运丰富的创面上时能可靠存活。全厚额部皮瓣可折叠以替代缺失的覆盖皮肤,并带有远端延续部分以连续地提供内衬里。第二期,3周后的中间手术中,此时已愈合至受区床的全厚额部皮瓣进行生理性延迟处理。在整个鼻植入区(除鼻小柱外),在无瘢痕的皮下平面掀起带有3至4毫米皮下脂肪(鼻皮肤厚度)的额部皮肤。皮片移植或折叠皮瓣与相邻的正常内衬里整合,并可与最初为其提供血运的覆盖层完全分离。如果使用了折叠额部皮瓣,沿着边缘将其切开游离,使近端覆盖皮瓣与远端内衬里延续部分完全分离。此时,其下方的皮下组织、额肌以及任何先前放置的软骨移植物都广泛暴露,多余的软组织可被切除以塑造理想的亚单位、坚固的皮下结构。如有需要,先前的一期软骨移植物可重新定位、塑形或增大。可放置延迟一期软骨移植物以支撑由皮片移植或折叠皮瓣形成的内衬里。然后将薄而柔软且贴合的额部覆盖皮肤放回下方坚硬、重新塑形的三维受区床上。不切断蒂部。第三期,3周后(初次转移后6周),切断蒂部。在90例针对部分和全层缺损的鼻再造手术中,超过10年的时间里,采用了带中间手术的三期额部皮瓣技术,使用了一期和延迟一期移植物,以及鼻内黏膜瓣(n = 15)、皮片移植(n = 11)、折叠额部皮瓣(n = 3)、翻转皮瓣(n = 5)、预制皮瓣(n = 4)和用于内衬里的游离皮瓣(n = 2)。额部皮瓣未发生坏死。部分缺损患者无需后期修复或仅需进行轻微修复。在全层缺损患者中,不到5%的患者需要进行一次大的修复和超过两次小的修复。总体而言,美学效果接近正常。计划中的带中间手术的三期额部皮瓣鼻修复技术:(1)转移质地细腻、贴合且厚度理想的额部皮肤用于覆盖,坏死风险小;(2)使用一期和延迟一期移植物,并允许在皮瓣切断前修改初始软骨移植物以纠正设计失误、位置不当或瘢痕挛缩;(3)创建理想的、由硬组织和软组织构成的坚固皮下框架,该框架通过覆盖皮肤得以体现,并能很好地融入相邻的受区组织;(4)扩展内衬里技术的应用,包括在第一期使用皮片移植作为内衬里,或在第二期作为“挽救手术”,并且还允许美观地使用折叠额部皮瓣作为内衬里;(5)确保为鼻的所有层次提供最大血供和血管安全性;(6)为外科医生提供挽救重建失败的选择;(7)在减少修复手术的次数和难度以及总体修复时间的同时提高美学效果;(8)强调解剖结构(覆盖层、内衬里和支撑结构)的相互依存关系,并为鼻再造中伤口损伤和修复本质提供见解。