Grover Chander, Bansal Shikha, Gupta Somesh
Department of Dermatology and STD, University College of Medical Sciences and GTB Hospital, Delhi, India.
Department of Dermatology and STD, Vardhaman Mahavir Medical College and Safdarjung Hospital, Delhi, India.
J Cutan Aesthet Surg. 2024 Oct-Dec;17(4):343-347. doi: 10.4103/JCAS.JCAS_67_23. Epub 2023 Aug 4.
Langer's lines, lines of cleavage, and biodynamic excisional skin tension (BEST) lines have been defined for cutaneous surgery to ensure excisional wound closure with the least tension on any part of the body and minimize scarring. This article describes nail unit incision lines (NUIL) with a similar perspective. NUIL are followed by nail surgeons to help regrowth of a normal nail; however, they are not widely understood or respected during nail surgery. Within the anatomically small nail unit, the orientation of these lines varies depending on the area being operated upon. Nail bed incisions should be oriented longitudinally, while nail matrix incisions should be oriented horizontally. Being the germinative portion, the nail matrix should be dealt with more cautiously, avoiding the lunular margin. Lateral nail fold incisions should be longitudinal, while proximal nail fold incisions should be radial. Distal nail fold (hyponychial) incisions should preferably be oriented parallel to the distal nail ridge. Knowledge and compliance with NUIL can help minimize scarring outcomes in nail surgery.
朗格线、分裂线和生物动力切除皮肤张力（BEST）线已被定义用于皮肤外科手术，以确保在身体任何部位以最小的张力闭合切除伤口并使瘢痕形成最小化。本文从类似的角度描述了指甲单位切口线（NUIL）。指甲外科医生遵循NUIL来帮助正常指甲再生；然而，在指甲手术过程中，它们并未得到广泛的理解和重视。在解剖学上较小的指甲单位内，这些线的方向因手术部位而异。甲床切口应纵向定位，而甲母质切口应横向定位。作为生发部位，甲母质应更谨慎地处理，避免半月形边缘。外侧甲襞切口应纵向，而近端甲襞切口应呈放射状。远端甲襞（甲下）切口最好与远端甲嵴平行定位。了解并遵循NUIL有助于将指甲手术中的瘢痕形成结果降至最低。
