Bond strength analysis of the bone cement- stem interface of hip arthroplasties

OBJECTIVE@#To study and establish the preliminary linear and modified models for the interface shear mechanics performance between implant and bone cement and to explore its damage significance.@*METHOD@#The loosening research between artificial hip joint prosthesis stem and bone cement interface performance can be evaluated by the push-in test. Based on the debonding performance test, the analytical expressions of the average load and displacement from the debonding failure and splitting failure process were deduced and determined. The correlations of the expressions of the average load-displacement and statistical experimental data were analyzed.@*RESULTS@#It demonstrated that the interface debonding failure mechanical model could be characterized as interface bond strength mechanical performance. Based on analysis of models and experimental data by the three statistical analysis methods, the results indicated the modified model could be better represented by the interfacial debonding strength properties. The bond stress τ and relative sliding s distribution along the embedment regional were coupling affected by both pressure arch effect and shear lag effect in bone cement. Two stress peaks of implant have been found at the distance from 0.175La loading tip to 0.325La free tip, which also verified the early loosening clinical reports for the proximal and latter region. As the bone cement arch effect, the bond stress peak tend to move to the free tip when the debonding failure would be changed into the splitting failure, which presents a preliminary study on the mechanism of early debonding failure for the stem-cement interface.@*CONCLUSIONS@#Functional models of the stem-bone cement interfacial debonding failure are developed to analyze the relevant mechanism. The different locational titanium alloy stress, and the interfacial bond stress and the relative slides are evaluated to acquire a guide of the different positions of interfacial damage. The coupling effect which is original from the pressure arch and the interfacial shear hysteresis cumulative effect has influence on the interfacial debonding and damage process.

Study on clinical intervention of jiawei shengdan louxie sini fang on coronary heart disease with depression / 中国中药杂志

<p><b>OBJECTIVE</b>To study the differentiation of symptoms and signs of major syndrome factors of traditional Chinese medicine and the efficacy of Jiawei Shengdan Louxie Sini Fang combined with methods for nourishing qi and yin, promoting blood circulation, nourishing heart and kidney, soothing and nourishing liver and reducing phlegm.</p><p><b>METHOD</b>In the randomized controlled clinical trial, patients of coronary heart disease with stable angina and depression are selected and divided into the traditional Chinese medicine intervention group and the western medicine control group. Maintaining the basic treatment with western medicines for coronary heart disease, the Chinese traditional medicine group was administered with Jiawei Shengdan Louxie Sini Fang, while the western medicine control group fluoxetine.</p><p><b>RESULT</b>Compared with the control group, the traditional Chinese medicine group was better in angina curative effect, syndrome curative effect and HAMA rating scale. In the comparison for sign and symptom score, the test group was better than the control group in short of breath, lack of power, self-sweat, night sweats, insomnia, frequent micturition in night, constipation, abdominal distension, frequent deep sigh, pharynx obstruction and dark color of lips.</p><p><b>CONCLUSION</b>Intervention with traditional Chinese medicine can ameliorate angina and other symptoms of whole body. It can also improve anxiety scores of patients in order to reduce the impact of depression and anxiety on coronary heart disease.</p>

Current situation of research and problems in diagnosis and treatment of senile depression with integrative traditional Chinese and Western medicine / 中国中西医结合杂志

This paper summarized the researches on diagnosis and treatment of senile depression with integrative Chinese and Western medicine in the recent 5 years, and some problems existed at present were also submitted. It is pointed out that it's necessary to expand the study with senior electrocerebral neurotransmitter analysis technique (SET) for the diagnosis and efficacy evaluation of senile depression by either traditional Chinese or Western medicine. By which it would also be able to offer convincing evidence for diagnosis of depression, TCM syndrome differentiation dependant therapy and the efficacy evaluation.