Study on micro-hardness distribution characteristics of human metacarpal bones

中华手外科杂志 Pub Date : 2020-02-10 DOI:10.3760/CMA.J.ISSN.1005-054X.2020.01.020

B. Yin, X. Shao, Chang-ping Zhao, Jialiang Guo, Jian-chao Wang, Yingze Zhang

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Abstract

Objective To report the micro-hardness of human metacarpal bones, compare and analyze the hardness values between different anatomical parts, and explore the distribution characteristics of micro-hardness of human metacarpal bones. Methods The metacarpal bones were collected from three fresh healthy frozen specimens. The soft tissue of the right metacarpal bone was dissected. These metacarpal bones were cut into 3 mm-thick slices perpendicular to the long axis with a low-speed saw in metacarpal base, shaft and head. The Vickers method was used to measure the hardness of different areas of the palmar, dorsal, medial and lateral site of bone slices, and the standard operation method with 50 g force loading for 50 s and maintenance for 12 s was used to determine the hardness. The hardness value was compared by one-way ANOVA, and P<0.05 was statistically significant. Results Totally, 45 specimens and 900 indentations at different bones and anatomic sites were involved. The overall hardness of metacarpal bone was (38.23±7.15) HV. The third metacarpal bone had the highest hardness (41.04±6.75) HV, followed by the second metacarpal bone (39.62±7.64) HV, the first metacarpal bone (37.83±6.52) HV, the fifth metacarpal bone (36.69±7.30) HV, and the fourth metacarpal bone (35.97±6.28) HV. The metacarpal shaft hardness (43.45±6.35) HV was higher than metacarpal basal (35.82±6.17) HV and metacarpal head (35.43±5.85) HV (F=16.415, P<0.01). There was no significant difference in palmar (37.58±7.35) HV, dorsal (38.93±7.08) HV, medial (38.26±7.00) HV and lateral site (38.15±7.14) HV in hardness (F=1.352, P=0.256). Conclusion The results of this study have deepened the understanding of metacarpal micro-biomechanical properties, and can guide the placement, direction and number of internal fixators in metacarpal fracture surgery, and provide data support for 3D printing of artificial metacarpophalangeal joint for the treatment of comminuted metacarpal fracture or defect. Key words: Metacarpal bones; Biomechanics; Vickers hardness; Micro-hardness

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人掌骨显微硬度分布特征的研究

目的报道人掌骨显微硬度，比较分析不同解剖部位的硬度值，探讨人掌骨显微硬度的分布特征。方法采集3例新鲜健康冷冻标本。解剖右掌骨软组织。这些掌骨骨被低速锯切成垂直于长轴的3毫米厚的薄片，在掌骨基部、柄和头。采用维氏法测定骨片掌部、背侧、内侧、外侧不同部位的硬度，采用50g力加载50s、维持12s的标准操作方法测定硬度。硬度值比较采用单因素方差分析，P<0.05有统计学意义。结果共涉及45个标本，900个不同骨骼和解剖部位的压痕。掌骨总硬度为(38.23±7.15)HV。第3掌骨硬度最高(41.04±6.75)HV，其次是第2掌骨(39.62±7.64)HV，第1掌骨(37.83±6.52)HV，第5掌骨(36.69±7.30)HV，第4掌骨(35.97±6.28)HV。掌骨柄硬度(43.45±6.35)HV高于掌骨基底硬度(35.82±6.17)HV和掌骨头硬度(35.43±5.85)HV (F=16.415, P<0.01)。手掌(37.58±7.35)、背侧(38.93±7.08)、内侧(38.26±7.00)、外侧(38.15±7.14)HV硬度差异无统计学意义(F=1.352, P=0.256)。结论本研究结果加深了对掌骨微力学特性的认识，可指导掌骨骨折手术中内固定物的放置、方向和数量，为3D打印人工掌骨指关节治疗粉碎性掌骨骨折或掌骨缺损提供数据支持。关键词:掌骨;生物力学;维氏硬度;微观硬度

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中华手外科杂志

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