Department of Plastic and Reconstructive Surgery, Saitama Medical School, Saitama, Japan.
Dermatology. 2013;226(4):315-8. doi: 10.1159/000350260. Epub 2013 Jun 22.
To assess the relationship between nail configuration and mechanical force, the nail morphology and pinch strengths of the paralyzed and non-paralyzed sides of patients with hemiplegia were measured.
Study 1: Analysis of nail configuration. Both thumb nails of 100 subjects with hemiplegia and 100 healthy volunteers (400 thumb nails) were enrolled. The left and right thumb nails were compared in terms of configuration, namely the curve index (defined as nail height/width). Study 2: Measurement of pinch strength. In 10 subjects with hemiplegia and 10 healthy volunteers, the pinch strengths of both sides were compared.
Study 1: In the subjects with hemiplegia, the palsy side had a significantly higher curve index than the non-palsy side (32.7 ± 8.3 vs. 24.4 ± 6.5%). The two sides of the healthy volunteers did not differ significantly in terms of the curve index. Study 2: In all hemiplegia cases, the non-palsy side had a higher pinch strength. The differences were statistically significant (4.40 ± 1.90 vs. 0.05 ± 0.16 kg). In the healthy volunteers, the dominant and non-dominant sides did not differ significantly.
Mechanical forces may affect the nail configuration and could participate in the pathophysiology of nail deformities.
评估指甲形态与力学之间的关系，测量偏瘫患者瘫痪侧和非瘫痪侧指甲形态和捏力。
研究 1：指甲形态分析。纳入 100 例偏瘫患者和 100 例健康志愿者（共 400 个拇指指甲）的双侧拇指指甲。比较左右拇指指甲的形态，即曲线指数（定义为指甲高度/宽度）。研究 2：捏力测量。在 10 例偏瘫患者和 10 例健康志愿者中，比较双侧捏力。
研究 1：在偏瘫患者中，瘫痪侧的曲线指数明显高于非瘫痪侧（32.7±8.3 对 24.4±6.5%）。健康志愿者的两侧曲线指数无显著差异。研究 2：所有偏瘫患者的非瘫痪侧捏力均较高，差异有统计学意义（4.40±1.90 对 0.05±0.16kg）。在健康志愿者中，优势侧和非优势侧无显著差异。
力学可能会影响指甲形态，并可能参与指甲畸形的病理生理学过程。
