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  • 1  THREE-D MECHANICAL ANALYSIS OF THE REDUCTION OF CLAVICLE FRACTURE
    董凡 章思炎 周慎杰 隋福生 杨茂清 朱惠芳 王菊芬 孙继泽 范冬竹
    1994, 9(1):26-33. DOI: 10.3871/j.1004-7220.1994.01.33.
    [Abstract](3296) [HTML](0) [PDF 0.00 Byte](533) [Cited by](36)
    Abstract:
    An analysis of mechanical characteristics of the anatomical,overlap,angle or rotation reductions of clavicle fracture is performed by the finite element method.The calculated joint forces,the stress or displacement patterns indicate that correct reduction is very important.Improper reduc tion techniques will not only result in cosmetic change,but also induce,in some serious cases,great lccal stresses,which give rise to traumatic arthritis.
    2  A COMPARATIVE BIOMECHANICAL STUDY OF FOUR INTERNAL FIXATION METHODS FOR DISTAL FEMORAL FRACTURES
    郑琦 毕大卫 王以进 顾军 刘耀升 谢水法 魏威
    2002, 17(2):75-79. DOI: 10.3871/j.1004-7220.2002.2.79.
    [Abstract](2040) [HTML](0) [PDF 0.00 Byte](0) [Cited by](29)
    Abstract:
    Objective By evaluating quantitative biomechanical comparison of four internal fixation methods for distal femoral fractures, to choose suitable clinical internal fixation method according to the experimental data. Methods The models of fracture of femoral condyle were made on 16 fresh cadaver femurs (C1 of AO classification) and fixed by supracondylar intramedullary interlocking nail, dynamic condyle screw plate, L shaped condyle plate and Ender's nail fixation respectively. To compare the four different methods by experimental stress analysis and theoretical analysis of finite element method. Results Under the same load condition, the supracondylar intramedullary interlocking nail absorbed more energy during axial loading compared with the other constructs(P<0.01). The dynamic condyle screw plate had the greatest torsional stiffness (P<0.01). There were no significant differences in torsional stiffness between GSHN and DCS. Conclusion Using supracondylar intramdullary inter locking nail and the dynamic condyle screw plate are better than the other internal fixation methods and deserve to be put into clinical application and populatization.
    3  BIOMECHANICAL EVALUATION OF SEVERAL POSTERIOR ATLANTOAXIAL FIXATION TECHNIQUES
    瞿东滨 金大地 欧阳均 赵卫东 钟世镇
    1999, 14(4):198-201. DOI: 10.3871/j.1004-7220.1999.4.201.
    [Abstract](1962) [HTML](0) [PDF 0.00 Byte](0) [Cited by](20)
    Abstract:
    To evaluate the biomechanical differences of pure or combined application of severalposterior atlantoaxial fixation techniques. Methods: The torques needed for five-degree rotationwere measured in seven preserved atlantoaxial complex specimens after these specimens werefi-cated with transarticular screw fixation(Magerl), Magerl plus Gallie wiring, Magerl plus Brookswiring, pure Gallie wiring, pure Brooks wiring, and pure Halifax interlaminar clamping,respectively. Results: The torque for Mager were 6.59 1.34Nm, which were significant greater thanthe torque for any other pure fixation techniques(p<0.0l), but less than the torque for Magerl plusBrooks wiring(p<0.01). No significant difference was found between the torque for Magerl and forMagerl plus Gallie wiring. The torque for Gallie wiring were the least among the posterioratlantoaxial fixation techniques studied. Conclusions: The Magerl technique is superior to othercommon posterior atlantoaxial fixation technique in anti-rota...更多tional capacity. It is not necessaryadding Gallie wiring to Magerl technique. 还原
    4  THE RELATIONSHIP BETWEEN BIOMECHANICAL PROPERTIES OF DEEP FROZEN CRYOPRESERVATING ALLOGRAFT AND THE PRESERVATING TIME
    杨克强 王臻 桑宏勋 吕昌伟 王海强 彭磊 李光新
    2000, 15(3):183-186. DOI: 10.3871/j.1004-7220.2000.3.186.
    [Abstract](1989) [HTML](0) [PDF 0.00 Byte](0) [Cited by](18)
    Abstract:
    Objective: To study the relationship between the preservating time of deep frozen cryopreservating allograft and the biomechanical properties. Method: Specimens of the fibular bones of deep frozen cryopreservation for 1 and 7 years were made into test pieces of torture and compaction.And the bending strength(BS) ,modulus of elasticity(ME) and compact strength(CS) were measured on the INSTRON1195 electronic tensile test machine.And the results were analysised with T test. Results:The 1 year group and the 7 year group had no significant difference in trems of BS(P>0.05) ,ME(P>0.05) and CS(P>0.05). Conclusion: Cryopreservation had no effects on the cortical bone biomechanics ,as long as not contaminated, the cryopreservation will be independent of storage time and the pre- or pro- operation treatments.
    5  STRESS ANALYSIS OF CERVICAL VERTEBRAE USING TRACTION AND COUNTER TRACTION MANIPULATION OF CHINESE MASSAGE AND THE EFFECT ON VBI
    许世雄 李信安 房敏 严隽陶 顾慎为
    1996, 11(2):71-77. DOI: 10.3871/j.1004-7220.1996.2.77.
    [Abstract](2195) [HTML](0) [PDF 0.00 Byte](0) [Cited by](17)
    Abstract:
    In this paper the biomechanics analysis showed theoretically that the stress of cervical vertebrae using Traction and Counter-Traction Manipulation of Chinese massage is consistent with clinical mechanical requiremant.TCD indexes of VBI cervical spondylopathy cases before and after operation of Traction and Counter-Traction Manipulation changed obviously,it verified the Traction and Counter-Traction Manipulation had desirable curative effect on VBI.
    6  BIOMECHANICAL STUDY AND CLINICAL APPLICATION OF FIXING DISTAL FEMORAL FRACTURE USING INTRAMEDULLARY SUPRACONDYLAR NAIL (LMSC)
    张秋琴 李强一 王以进 韩擎天 章文
    2001, 16(3):174-178. DOI: 10.3871/j.1004-7220.2001.3.178.
    [Abstract](1974) [HTML](0) [PDF 0.00 Byte](0) [Cited by](15)
    Abstract:
    Objective Quantitative biomechanical compairson of different internal fixation methods for distal femoral fractures provides theoretical basis for clinic curing. Method Performing theoretical and experimental stress analysis for fixing Y type femora fracture by using three different internal fixation methods. Results Under the same load condition Intramedullary supracondylar nail method is the best while for comprssed plate method the femoral condyle strength and origidity is worse (P<0.05). Conclusion Intramedullary Supracondylar nail Method is the best method among different internal fixation methods. It deserves to be put into application and populatization.
    7  Application of the HHT method to the wrist-pulse-signal analysis
    孙仁 沈海东 鲁传敬 王忆勤 李福凤
    2006, 21(2):87-93. DOI: 10.3871/j.1004-7220.2006.2.93.
    [Abstract](2063) [HTML](0) [PDF 0.00 Byte](1) [Cited by](15)
    Abstract:
    Objective In the paper, the HHT method is adopted to deal with the wrist pulse signals collected from patientbodies. Methods nonlinear and nonstationary series can be decomposed by using the empirical mode decompositionmethod (EMD) into a number of intrinsic mode function (IMF) components. These components are transformed into thoseexpressions called HH spectra which exhibit the amplitude-frequency-time distributions of the data, and then the marginalspectra are obtained by integrating the HH spectra with respect to time. This is a new and applicable time series analysismethod based on mode decomposition. Results A time series constructed from a set of standard cyclic functions isfirst treated with using the EMD method to verify the applicability and effectiveness. And then, two pulse signals, onefrom a healthy person and the other from a patient suffering from the coronary heart disease are decomposed and theirresults are discussed. Conclusion The HHT method has broad prospects in the biomedical engineering and bioinformaticsapplications.
    8  FLUX ANALYSIS OF AN ARTERY WITH A MOVING STENOSIS FORCED BY ROLLING MANIPULATION
    CHENG Wei-hua LV Lian XU Shi-xiong Y.T.Chew H.T.Low YAN Jun-tao SHEN Guo-quan SUN Wu-quan XU Jun
    2003, 18(1):1-5. DOI: 10.3871/j.1004-7220.2003.01.5.
    [Abstract](2905) [HTML](0) [PDF 0.00 Byte](520) [Cited by](14)
    Abstract:
    bjective Investigate the hemodynamical mechanism that rolling manipulation can promote blood circulation. Methods Hemodynamics in an artery with a moving stenosis forced by rolling manipulation has been investigated. By solving linearized N - S equations, varies of factors contributing to the flow rate have been discussed, including different Horizontal Penetration Parameters, different Maximal Stenosis Degrees and different Manipulation Frequencies. Results Larger Horizontal Penetration Parameter, faster Manipulation Frequency and smaller Maximal Stenosis Degree will make the flow increase. Conclusion The promition of the arterial blood flow rate by rolling manipulation depends on seceral factors, it agrees with the fact that appropriate rolling manipulation can promote blood circulation.
    9  The Effect of Different Diameters Powder on Setting Time and Compressive Stress of Carbonated Hydroxyapatite Cement
    MAO Ke-ya HAO Li-bo TANG Pei-fu WANG Ji-hong LV Shi-lin HE Da-wei WANG Yan LU Shi-bi
    2004, 19(1):6-9. DOI: 10.3871/j.1004-7220.2004.01.9.
    [Abstract](2871) [HTML](0) [PDF 0.00 Byte](481) [Cited by](13)
    Abstract:
    Objective To investigate the effect of different diameter powder on setting time and compressive stress of carbonated hydroxyapatite cement (CHC). Methods 400, 600 meshes and ultramicropowder were prepared by grind and ultramicropowder methods, and the effects on setting time and compressive stress were observed. Results The average diameter of ultramicropowder was 3.109μm, and the specific surface area was 2.288m 2/cm 3. Under 37℃ and 100% humidity, the setting time shorten along with the reduced diameter powder, and the compressive stress increased along with the reduced diameter powder. The initial setting time of ultramicropowder CHC was 3 minutes, and the final setting time was 8 minutes. The final compressive of ultramicropowder CHC stress was (51.042±3.728)MPa. Conclusion The results showed ultramicropowder CHC could solidify in situ with rational setting time and high compressive stress, which adapt to clinical application.
    10  THE STUDY OF FINITE ELEMENT MODEL FOR LUMBAR VERTEBRAE IN TORSION
    BI Sheng ZHANG De-wen ZHANG Ming
    2002, 17(1):20-23. DOI: 10.3871/j.1004-7220.2002.1.23.
    [Abstract](2787) [HTML](0) [PDF 0.00 Byte](495) [Cited by](12)
    Abstract:
    To investigate the stress changes of lumbar vertebrae internal structure in torsion by using a finite element mod-el.The three-dimensional finite element model of an intact L 4 -L 5 lumbar motion segment was established and loaded under different force of torsion.The results showed that the rotation degrees of L 4 -L 5 segment,average axial effective stress of intervertebral disc,pore pressure,fiber stress and strain and facet load increased with the increase of torsion.
    11  Mechanical Virtual Human of China
    王成焘
    2006, 21(3):172-178. DOI: 10.3871/j.1004-7220.2006.3.178.
    [Abstract](2706) [HTML](0) [PDF 0.00 Byte](1) [Cited by](12)
    Abstract:
    Mechanical Virtual Human of China is a key research project supported by National Natural Science Foundation.A human musculoskeletal system will be built, and this system will be able to export transformed individualizedmusculoskeletal geometric model for specific human parameters. Motion capture system will be employed to measurehuman motion and results will be transformed into musculoskeletal model motion. Through kinematics, kinetics and forceanalysis, joint and muscle forces can be determined for whole process of a specific motion. The musculoskeletal systemis also a finite element model, and FE analysis can be performed for global or local skeletal components. A large scalesoftware system will be developed to support all these calculations and analyses, and this software system will findwide applications in such areas as medical engineering, medical instrument design, physical and art education, ergonomicsand traffic accident analysis.
    12  INVESTIGATION ON STABILITY OF SHAPE MEMORY SAWTEETHARM EMBRACING INTERNAL FIXATOR
    祖晓水 戴克戎 吴小涛 徐秀林 薛文东
    1995, 10(2):102-108. DOI: 10.3871/j.1004-7220.1995.2.108.
    [Abstract](1961) [HTML](0) [PDF 0.00 Byte](0) [Cited by](11)
    Abstract:
    Transverse osteotomy was performed at the middle of each of 52 dog femur.and then fixed pespectively with shape memory sawteeth-arm embracing internal fixator,bone plate and intramedullary nail.The stress shielding rate,bending strength of different directions and torsion strength of the three different fixation methods were measured and compared.The embracing force of the embracing fixtor was found to be high enough,so that the bending force between the embracing fixatorgroup and bone plate group showed no significant difference.But thestress shielding rate of the embracing fixation group was much lower than that of the bone plate group(p<0.01).While the torsion strength of the embracing fixator group was significantly higher than that of intramedullary nail group(p<0.01),The results showed that the embracing fixtor to provide reliable fracture fixation, and prevent osteoporosis caused by stress shielding of bone plate.The embracing fixator also has a good property in the resistance to torsion which is less than that in case of intramedullary nailing fixation, and does not induce further damage to the intramedullary circulation.
    13  A STUDY ON REPAIRING MECHANISM OF THE FEMORAL HEAD NECROSIS TREATED WITH CHINESE HERB
    何伟 袁浩 方斌 徐传毅 王以进 许兆龙 李永丰
    2000, 15(3):162-165. DOI: 10.3871/j.1004-7220.2000.3.165.
    [Abstract](1958) [HTML](0) [PDF 0.00 Byte](0) [Cited by](11)
    Abstract:
    To investigate the repairing mechanism of necrotic femoral head treated with Shengmai Chenggu capsule, we measured the mechanical properties and biochemical components of steroid-induced necrosis of femoral head in the rabbits. The results revealed the mechanical properties osteocalcium, the ratio of Ca/P and collegen of the femoral head in the group treated with Chinese herb were better than those in the group control and model. It indicated Shengmai Chenggu capsule can modify biochemistry metabolism, improve necrotic bone repairing.
    14  THREE DIMENSIONAL FINITE ELEMENT ANALYSIS OF LUMBAR INTER-BODY FUSION
    刘红欣 王以进
    2001, 16(3):169-173. DOI: 10.3871/j.1004-7220.2001.3.173.
    [Abstract](1952) [HTML](0) [PDF 0.00 Byte](0) [Cited by](11)
    Abstract:
    Three dimensions finite element model of lumbar inter-body fusion was established to analyse internal biomechanical responses of lumbar inter-body. Single inter vertebrae fusion was performed and fixed with pedicle screw then we observed stresses distribution of lumbar and analysed degeneration mechanism of the neighboring inter-vertebrae joints. The study provided some information on the design and application of spinal internal fixation devices. At the same time we indroduced a model on studies of the lumbar fusion and fixation.
    15  A NEW POINT CONTACT-DYNAMIC COMPRESSION PLATE BIOMECHANICAL EVALUATION
    ZHAO Yu-feng LI Qi-hong GU Zu-chao XU Jian-zhong YANG Liu
    2002, 17(1):58-62. DOI: 10.3871/j.1004-7220.2002.01.62.
    [Abstract](2845) [HTML](0) [PDF 0.00 Byte](454) [Cited by](11)
    Abstract:
    To determine the mechanical properties(stiffness)and compression force of a new design of point contact plate,with the ability of dynamic compression for reducing the gap at the fracture site and enhancing the stability.Methods:A device wasused compare the compression force of point contact-dynamic compression plate(PC-DCP)with that of dynamic compression plate(DCP)when a cortical screw was placed at compression position.In20paired fresh cadaveric sheep tibiae,mid-shaft transverse osteotomies were created and fixed with PC-DCPs and DCPs.In10pairs,compression force was applied at the fracture sites.In the other10paires,there was a3-mm gap between the fracture sites.Four point bending and torsion tests were conducted to determine the bend-ing and torsion stiffness.Results:there were no statistically significant differences in compression force between the DCPs and PC-DCPs (p>0.05).Whether there was a bone gap or not,no significant differences in bending and torsion stiffness were seen.between the two experimental plates(p>0.05).Conclusion:The PC-DCP can ap-ply a comparable compression force between the fracture gap.Mechanically,the PC-DCP plate has adequate sta-bility in clinical application.
    16  Hepatic visualization and virtual surgery study on the Chinese visual human
    李恺 谭立文 刘正津 张绍祥
    2006, 21(3):187-191. DOI: 10.3871/j.1004-7220.2006.3.191.
    [Abstract](2174) [HTML](0) [PDF 0.00 Byte](0) [Cited by](11)
    Abstract:
    Objective To build digitized visible model of the liver and intrahepatic vessels of the visual Chinese man,providing morphological data for virtual surgery of liver. Methods The datum collected from the visual Chinese manliver were used with 3D-reconstruction to build digitized visual model of the liver, and to realize the virtual surgery.Results The quality of the computerized 3D-reconstructed model was distinct and perfect. Any diameter and angle ofthe structures reconstructed could be resected conveniently to acquire the object center, surface and volume of hepaticsegment. Conclusions The creation of visual liver model can be used for the digital anatomy teaching, and for thehepatic virtual surgery of hepatic cancer.
    17  A BIOMECHANICAL STUDY OF THE STABILIZATION OF TRANSPEDICLE SCREW FIXATION
    王正 沈国平 陈伟兵 王以进
    2002, 17(2):80-84. DOI: 10.3871/j.1004-7220.2002.2.84.
    [Abstract](2072) [HTML](0) [PDF 0.00 Byte](0) [Cited by](10)
    Abstract:
    Objective The thoracolumbar vertebra fracture is usually treated by transpedicle screw fixation. Since its effects are correlated to such factors as the length and the implanted direction of screw ,BMD etc. This study was made to provide some biomechanical evidence for better clinical operation.Methods To take six cadaveric lumbar spines to undertake tests with experimental stress analysis.Results The strain of long screw compared with short ones,is respectively 16%, 41%, 56%, 41% lesser in compression,anterior flection,posterior extension and luteral flection;the strength is improved by 16%, 41%, 55% and 41%; the displecement of spine is lower by 18%, 25%, 32% and 30%;the axial rigidity is improved by 18%, 25%, 32% and 30%(P<0.05).The drawing strength of screw implanted in parallel direction is larger by 20% than screw implanted in 7° direction,while the drawing displacement increased by 7%,the energy increased by 18%(P<0.05). With regard to the bone density effect on drawing strength, the normal group is larger than osteoprotic group by 67%. There is average 16% difference in the relative displacement ,strain and energy.Conclusion The relative factors of the fixation that mentioned above should be caused attention in operation so that it can improve the operative quality and reduce complications.

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