Yin Bing, Li Sheng, Guo Jialiang, Wang Jiangzhao, Zhang Yingze
Department of Orthopedics, the Third Affiliated Hospital to Hebei Medical University, Orthopaedic Research Institution of Hebei Province, Key Laboratory of Orthopaedics Biomechanics of Hebei Province, Shijiazhuang 050051, China
Abstract:Objective To explore the distribution and significance of microhardness of human carpal bones.Methods Three fresh frozen bodies with age > 40 years old, good health and no chronic history were selected and right limbs were used. These carpal bones (navicular bone, lunate bone, capitate bone, hamate bone, trapezium and trapezoid bone) were cut into 3 mm thick slices with a low-speed saw. A microindenter tted with a Vickers indenter point was used to measure the Vickers hardness in the cortical region in the bone slices of navicular bone, lunate bone, capitate bone, hamate bone, trapezium and trapezoid bone. In this series of studies, the standard operating method of 50 gf force loading 50 s and maintaining 12 s was used to determine the hardness values. Five effective region values were selected in the same area, and the average value of all the effective values was taken as the hardness value of the part. Vickers hardness values of different regions were recorded and analyzed.Results Totally, 18 specimens and 255 indentations at different bones and anatomic sites were involved in our result. Among all carpal bones, the hamate bone (39.04±5.79) HV represented the largest hardness, followed by the capitate bone (38.98±6.17) HV, scaphoid bone (37.72±5.85) HV, trapezium bone (35.89±4.75) HV, lunate bone (33.65±5.42) HV and trapezoid bone (31.82±5.54) HV. There were statistically significant differences in hardness among different bones (F=10.783, P<0.01).The highest hardness value existed in the medial of scaphoid waist (40.00 HV) and the lowest hardness existed in the scaphoid body (36.31 HV). The tubercle of scaphoid bone, medial and lateral of scaphoid waist and scaphoid body were measured and analyzed. No significant differences were found among the four sites(F=1.129, P>0.05). The Vickers hardness were similar in the metacarpal site, metacarpal, dorsal and distal site of the lunate bone(F=2.040, P>0.05).Conclusions Vickers hardness in different bones of healthy person wrist bones are different, whereas the hardness distribution of all parts of scaphoid and lunate bone is consistent. Measuring the microhardness value of wrist bone and understanding its distribution characteristics can help to understand the microbiomechanical properties of wrist bone, and also guide the selection of internal fixation methods for wrist bone fracture, so as to design and make wrist bone prosthesis more in line with human physiology and establish the finite element model of wrist muscule-bone tissue. Trial Registation Chinese Clinical Trail Registry, ChiCTR-TNC-17010818.
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Yin Bing, Li Sheng, Guo Jialiang, Wang Jiangzhao, Zhang Yingze. Distribution of human carpal bone microhardness. Chinese Journal of Anatomy and Clinics, 2020, 25(2): 93-97.
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