Punia Sudhanshu, Goel Aakanksha, Gupta Amit
Aesthetic and Cosmetic Plastic Surgery, Divine Aesthetic Surgery, Greater Kailash, New Delhi, India.
Indian J Plast Surg. 2024 Jun 12;57(6):474-478. doi: 10.1055/s-0044-1787655. eCollection 2024 Dec.
Most common type of hair loss is androgenetic alopecia. Orentreich's donor dominance theory and the definition of safe donor area are the theoretical foundation of modern hair transplantation. In safe donor area no progression of permanent hair loss occurs. Its knowledge is important to prevent loss of transplanted hair. Estimation is not tailored to every patient, also in early stages, the margins are assumed to be free from future hair loss. Our study is an attempt to find and establish a relationship between safe zone dimensions and other standard scalp dimensions, and effectively predict the complete safe zone in early stages of hair loss. From July to December 2022, the first 100 patients with Norwood IV onwards of hair loss were included. Then, the distance between the vertex and the point of change in occipital hair quality and density was measured, and from this point till occipital protuberance were taken. The ratio between the two was taken. In the next 100 patients of Norwood II to IVa, the applicability of the new ratio to assess the permanent zone was used. Ratio method takes into account the patient's measurements, that is, permanent zone and total distance from vertex occiput. The ratio range we got is: Permanent zone: total distance from vertex to occiput: 0.43-0.53 Therefore, the permanent zone would be equal to = total distance from vertex to occiput × 0.43-0.53. With the lower limit being the occiput. Over 90% of the patients did not have significant reduction in density of transplanted hair. The authors suggest the use of this ratio method to determine the dimensions of the permanent zone especially in patients with early grades of hair loss as per the Norwood scale. It is a simple, effective, and easily applicable concept that can ensure long-lasting results in patients undergoing hair transplants.
最常见的脱发类型是雄激素性脱发。奥伦特里奇的供体优势理论和安全供体区的定义是现代毛发移植的理论基础。在安全供体区内，永久性脱发不会进展。了解这一点对于防止移植毛发的脱落很重要。评估并非针对每个患者量身定制，即使在早期阶段，也假定边缘部位不会出现未来脱发。我们的研究旨在寻找并建立安全区尺寸与其他标准头皮尺寸之间的关系，并在脱发早期有效预测完整的安全区。
2022年7月至12月，纳入了首批100例诺伍德IV级及以上脱发患者。然后，测量头顶与枕部毛发质量和密度变化点之间的距离，并从该点到枕外隆凸进行测量。计算两者之间的比例。在接下来的100例诺伍德II至IVa级患者中，使用新比例评估永久区的适用性。
比例法考虑了患者的测量数据，即永久区和从头顶到枕部的总距离。我们得到的比例范围是：永久区：从头顶到枕部的总距离为0.43 - 0.53。因此，永久区将等于 = 从头顶到枕部的总距离×0.43 - 0.53。下限为枕部。超过90%的患者移植毛发密度没有明显降低。
作者建议使用这种比例法来确定永久区的尺寸，特别是对于诺伍德分级中早期脱发的患者。这是一个简单、有效且易于应用的概念，可以确保毛发移植患者获得持久的效果。
