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| ZHANG Xiaojuan,GUO Jialiang,HU Zusheng.Study on the hardness of human axis by Vickers micro-hardness measurement in vitro[J].Chinese Journal of Spine and Spinal Cord,2021,(2):152-157. |
| Study on the hardness of human axis by Vickers micro-hardness measurement in vitro |
| Received:April 03, 2020 Revised:January 13, 2021 |
| English Keywords:Axis Bone hardness Micro-indentation Biomechanics |
| Fund:国家自然科学基金（81572125，81501934） |
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| English Abstract: |
| 【Abstract】 Objectives: To measure and analyze the distribution and clinical significance of micro-hardness in the human body. Methods: The axis of 3 fresh cadaver specimens (62-year-old male, 45-year-old female, and 58-year-old male) were collected. X-ray and quantitative CT examination were applied to rule out diseases affectingthe quality of bone. The axis was divided intotwo measurement sites: theodontoid and vertebral body area and the attachment area, and 1 specimen of 3mm was collected in each area using high precision fine slowly saw, a total of 6 pieces of 3 epistrophei. In the odontoidand vertebral body area, the cortical bone regions of the upper, lower, anterior and posterior parts and the cancellous bone region inthe middle were selected. In the attachment area, the pedicle, transverse process, lamina and lateral mass cortical bone areas and the middle lateral mass cancellous area were selected. 10 areas were selected for each axis, totaling 30. The specimens were fixed on the plain glass slides, and the surface hardness of the specimens was measured by Vickers microhardness tester. 5 effective hardness values were randomly selected from each area, and 150 effective indentation hardness values were obtained in total. Microhardness distribution was recorded and analyzed. The unit was HV(kgf/mm2). Results: The overall hardness was 17.70-40.60HV. The hardness of the cortical bone ranged from 17.70 to 40.60HV, with an average hardness of 30.10±4.96HV; and the hardness of the cancellous bone ranged from 20.40 to 37.40HV, with an average hardness of 29.06±4.42HV. The average hardness of the cortical bone in the odontoid and vertebral body area was 30.25±5.06HV, and that in the attachment area was 29.95±4.90HV. The average hardness of cancellous bone in the odontoid and vertebral body area was 28.78±4.17HV, and 29.33±4.79HV in the attachment area, and both differences were not statistically significant.The hardness of cortical bone was higher than that of cancellous bone in the same region. The bone micro-hardness values of the three donors′ epistrophei in different measuring regions were different, but the variation pattern was consistent with the overall trend. The micro-hardness value of the pedicle cortex in the attachment area was the highest(32.92±4.06HV), and the difference between the groups was statistically significant(F=3.5832, P=0.014). The hardness of the posterior cortex of the odontoid and vertebral body area was the highest(33.23±4.80HV), and the difference between the groups was statistically significant(F=3.363, P=0.025). Conclusions: The hardness of the posterior cortex of the odontoid and vertebral body area and the hardness of the pedicle cortex of the attachment area were both high in values, which may be related to the greater stress on these parts. |
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