| 1 | Tissue level microstructure and mechanical properties of the femoral head in the proximal femur of fracture patients显示文摘This study aims to investigate the regional variations of trabecular morphological parameters and mechanical parameters of the femoral head,as well as to determine the relationship between trabecular morphological and mechanical parameters.Seven femoral heads from patients with fractured proximal femur were scanned using a micro-CT system.Each femoral head was divided into 12 sub-regions according to the trabecular orientation.One 125 mm^3 trabecular cubic model was reconstructed from each sub-region.A total of 81 trabecular models were reconstructed,except three destroyed sub-regions from two femoral heads during the surgery.Trabecular morphological parameters,i.e.trabecular separation(Tb.Sp),trabecular thickness(Tb.Th),specific bone surface(BS/B V),bone volume fraction(BV/TV),structural model index(SMI),and degree of anisotropy(DA) were measured.Micro-finite element analyses were performed for each cube to obtain the apparent Young's modulus and tissue level von Mises stress distribution under 1%compressive strain along three orthogonal directions,respectively.Results revealed significant regional variations in the morphological parameters(P<0.05).Young's moduli along the trabecular orientation were significantly higher than those along the other two directions.In general,trabecular mechanical properties in the medial region were lower than those in the lateral region.Trabecular mechanical parameters along the trabecular orientation were significantly correlated with BS/BV,BV/TV,Tb.Th,and DA.In this study,regional variations of microstructural features and mechanical properties in the femoral head of patients with proximal femur fracture were thoroughly investigated at the tissue level.The results of this study will help to elucidate the mechanism of femoral head fracture for reducing fracture risk and developing treatment strategies for the elderly. | Linwei Lü Guangwei Meng He Gong Dong Zhu Jiazi Gao Yubo Fan | 2015 | Acta Mechanica Sinica2015，31，2： | 4 |
| 2 | Kidney-Qi deficiency diagnosed by Deng's diagnosis standard was not correlated with aging based on clinical observation of 90 participants显示文摘OBJECTIVE: To verify the Traditional Chinese Medicine(TCM) theory that kidney-Qi deficiency(KQD)is considered to be the main cause of aging using cross-sectional study.METHODS: Demographic and lifestyle characteristics of 90 healthy participants were collected with a self-administered questionnaire. KQD syndrome was diagnosed according to Deng's diagnosis standard. Creatinine-adjusted urinary 8-hydroxy-2'-deoxyguanosine(8-OH-dG) and 8-isomeric-prostaglandin2α(8-iso-PGF2α), salivary advanced oxidation protein products(AOPPs), malondialdehyde(MDA) and dehydroepiandrosterone-sulfate(DHEA-S) were selected as aging markers and measured using enzyme-linked immunosorbent assay.RESULTS: No significant differences were observed in participant characteristics between the KQD group and non-KQD(NKQD) group(P > 0.05). Levels of 8-OH-dG, 8-iso-PGF2α, AOPPs, and MDA increased with age, except for a slight decrease in8-OH-dG in the older group. The increase in8-iso-PGF2α was significant(P < 0.05). DHEA-S significantly decreased with increasing age(P < 0.01).8-OH-dG levels were higher in the KQD group compared with the NKQD group. Levels of urinary8-iso-PGF2α, salivary AOPPs, and MDA in the KQD group were lower than in the NKQD group. Salivary DHEA-S was higher in the KQD group compared with the NKQD group. However, differences between KQD group and NKQD group were not significant.CONCLUSION: The current results suggested that KQD syndrome, as diagnosed by Deng's standard,does not underlie the aging phenotype. | Zhao Zhengxiao Liu Lumei Tang Zihui Mohammadtursun Nabijan Lu Linwei Li Mihui Lü Yibao Mo Shuming Ma Wenjuan Wang Meng Wei Ying Gong Weiyi Dong Jingcheng | 2019 | Journal of Traditional Chinese Medicine2019，39，2： | 0 |
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