Distribution characteristics and clinical significance of clavicle microindentation hardness
10.3760/cma.j.issn.1001-8050.2019.09.008
- VernacularTitle: 锁骨显微压痕硬度的分布特征及临床意义
- Author:
Xiaojuan ZHANG
1
;
Jianzhao WANG
1
;
Bing YIN
1
;
Sheng LI
1
;
Guobin LIU
1
;
Zusheng HU
1
;
Weiwei WU
1
;
Yingze ZHANG
1
Author Information
1. Department of Orthopedic Surgery, Third Hospital of Hebei Medical University, Orthopedic Research Institution of Hebei Province, Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang 050051, China
- Publication Type:Journal Article
- Keywords:
Biomechanics;
Joint prosthesis;
Micro-indentation
- From:
Chinese Journal of Trauma
2019;35(9):811-816
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the distribution characteristics and significance of bone hardness in different segments and layers of clavicle.
Methods:The right clavicles of three fresh Chinese corpses were taken and then divided into proximal, middle and distal segments according to Allman's classification. The clavicles were cut with diamond saw in the vertical of long axis equidistant exactly into 15 layers (proximal: 3 layers; midshaft: 7 layers; distal: 5 layers), and each layer was divided into four directions: superior, inferior, anterior, and posterior. The bone hardness were measured by Vickers microindentation, HV(kgf/mm2). The distribution of bone hardness was recorded and analyzed.
Results:A total of 180 parts of cortical bone were measured, generating 900 measurements. Meanwhile, a total of 45 parts of cancellous bone were measured, generating 225 measurements. We found that: (1)The average hardness of cortical bone was (35.9±8.1)HV, and the midshaft segment [(41.3±6.8)HV] was harder than the proximal segment [(33.8±6.1)HV] and the distal segment [(29.7±5.4)HV](P<0.05); (2)The average hardness of cancellous bone was (30.7±6.2)HV, and there were significant differences among the midshaft segment [(34.5±5.5)HV], the proximal segment [(29.2±2.9)HV] and the distal segment [(26.3±5.1)HV](P<0.05); (3)for cortical bone, the hardest segment was the fifth layer of the midshaft segment [(44.8±8.6)HV] while the most soft segment was the fourth layer of the distal segment [(28.0±3.5)HV](P<0.05); (4)for cancellous bone, the hardest segment was the fifth layer of the midshaft segmnet [(36.8±5.1)HV] while the most soft was the fifth layer of the distal segment [(23.0±4.4)HV](P<0.05); (5)There were no statistically significant differences among four directions of segments(P>0.05).
Conclusion:The microindentation hardness varies greatly among different segments and layers of the clavicles. The cortical bone and cancellous bone have consistent hardness changes, which shows that the middle segment is obviously harder than the proximal and distal segments with a gradually gradient decreasing trend from the middle to both ends. The data can be used to guide the design of 3D printing implants that conform to the stress conduction characteristics of the clavicle under physiological conditions, and provide good data support for the modeling and finite element analysis of the clavicle under simulated physiological conditions.