1999, 14(3):129-133. DOI: 10.3871/j.1004-7220.1999.3.133.
Abstract:Purpose: To investigate the hemodynamics in human extremities Injuried arteries repaired byend-to-end anastomoses, evaluated the anticipation outcome of vascular repair. Methods : A clinicalanalysis was undertaken to evaluate the vessel complicance in repair of the major arteries injury byend-to-end anastomoses. The records of 21 patients with 27 arterial injuries repaired by end-to-endanastomoses were reviewed. Results; All were patent in the early postoperative period. 15 patientswere followed beyond half one year, there is no significant difference between the anastomoses andthe control side(p>0.05). The complicance of the time-group-1 (24 weeks) was lower than0.7 x 103/kpa and that of the time group-2 (>24 weeks) was higher than 0.7 x 103/Kpa, but there wasno significant difference between the different time-groups (24 weeks or >24 weeks) (p>0.05).Thevascular complicance in lower extremities is over that in upper extremities, and there also is nosignificant difference between them (p>0.05). Conelusionf: The complicance was good and accurateindex to evaluate the anticipation outcome of arterial injuries in human extremities repaired byed-to-end anastomoses and should be considered periodical and continuously during arterialreconstructive procedures.
1999, 14(3):134-137. DOI: 10.3871/j.1004-7220.1999.3.137.
Abstract:According to the fractal characteristic of RBC's aggregation, we first employed Monto-Carlo methodto simulate the whole process in which Mono-lattice RBCs change from separation to aggregation.This method avoided the limitations of prior models, With regard to the relation between fractaldimension and aggregation energy, we carried a further study on the mechanism of aggregation.
1999, 14(3):138-143. DOI: 10.3871/j.1004-7220.1999.3.143.
Abstract:The purpose of this study is to Investigate the effects of management on fatigue equation of skeletalmuscle after 7days continuous eccentric exercise. We estrablished continuous eccentric exercisemodels on rabbits lower-limbs and human elbow flexor muscles with specially designed equipment.Meanwhile, abservation was made on the management of manipulation, stretch, water bath, saltwarm bath, fumigant and lotion applived to the muscles livalved after exercise program. The resultsof fatigue equations of top work, top toque, mean toque and total work showed that manipulation,stretch, fumigant and lotion could effectively, relieve musslar fatigue.
1999, 14(3):144-151. DOI: 10.3871/j.1004-7220.1999.3.151.
Abstract:In this study, a pulsatile flow of a viscous incompressible fluid through an elastic straight tube witha mild stenosis whose amplitude oscillates in its radial direction was investigated. The distributionof pressure and pressure gradient was obviously different from those of flow through a straight tubewith an static stenosis. And it is closdy connected with Wormersley parameter, character of thewall of the tube, and the frequency of the stenosis amplitude oscillation. This study is important forfurther analysis of certain pathology or curative method.
1999, 14(3):152-155. DOI: 10.3871/j.1004-7220.1999.3.155.
Abstract:Based on the hypothesis that the trabecula is isotropic and adopting the fabric tensor whichdescribes the trabecula architecture, thus illustrated the relationship of the elastic coefficient ofcancellous bone with the fabric tensor, and the elastic coefficients of trabecula. They are thetheoretical basis for further studying the mechanical behavior of cancellous bone.
1999, 14(3):156-159. DOI: 10.3871/j.1004-7220.1999.3.159.
Abstract:The Pressure distribution of the subtalar joints in ten lower legs from fresh adult cadavers werestndied. On neutral Position and under a 600 N load the contact pressures in the subtalar jointswere determined by means of the pressure sensitive film. Results showed that the average contactPressure was 19.3 1.38kgf/cm2 in the joint. There was no significant difference between thepressures of the anterior and medial and the posterior articulation (P>0.05) Meanwhile the imageof the pressure sensitive film showed that a large amount of the load was transmitted by theanterior-lateral site of the posterior articulation. Clinical significance of these data was discussed.
1999, 14(3):160-162. DOI: 10.3871/j.1004-7220.1999.3.162.
Abstract:On the basis of the study of cadavers withe the technique of CT and DIP in this project, 50 youngmale cadavers were undergone investigations through scanning, image analysis, examnation andthe statistics. Thus, the accuracy and reliability of the inertial data includingl of the Chinese maleyoung bodies (the length, volume, mass and density of the segments of the body, et al.) wereabtained. Thus. the mass distribution of the Chinese male young bodies was determined. A series ofreliable data is then provided for establishing the model with inertial parameters of the Chinesehuman body and in addition a establishing means for study and analysis of the biomechanics ofhuman body is also furnished.
1999, 14(3):163-165. DOI: 10.3871/j.1004-7220.1999.3.165.
Abstract:Values of the Casson Viscosity (CV) and Casson yield stress(CY) in the blood of hamsters and SDrats were obtained by unitary linearly regression. Results : There was not significantly difference inthe CV value between hamsters and rats (p>0.05). Significantly difference was found in the CYvalue (p<0.01). The results suggests that : in the study of the erythrocyte deformabllity propertiesabout diseases and medicines, hamster as well as rats can be act as a good animal model, but in thestudies which have significantly erythrocyte assemble properties, it's better to choose SD rats. Iferythrocyte assemble property is not significant, the hamster may be a better choice. It has animportant significance to popularize and spread the CV and CY in the hemorheology study.
1999, 14(3):166-170. DOI: 10.3871/j.1004-7220.1999.3.170.
Abstract:Tish article researches on the bilmddimical experiments with modified fissile spiral style artificialflip joint.With the applied force of hip joint, It is illustrated with joint, stress on the inside andoutside or femur and strein distribution curve. Moreover experiments are conducted on the firmnessof the artificial hip joint. biomedinical experiments and clinieal apllieation indicate that modifiedfissile spiral style artificial hip joint can form secure biological fixation and make reasonal stressconduction
1999, 14(3):171-174. DOI: 10.3871/j.1004-7220.1999.3.174.
Abstract:To compare the amount of periimplant bone resorption and the degree of aseptic looseningof the implant induced by various kinds of wear particles released from artificial joint. Method:Three special particles of UHMWPE, Ti-6Al-4V and Co -- Cr-- Mo were used respectively to inducethe change of periimplant bone structure and the loosening of a well-fixed implant made of titaniumalloy in rabbit femur or tibia. The bone structure was observed from X-ray film with computerizedimage analysis system(CIAS) and implant loosening was assayed by push-out test. All data werestatistically analysed. Results Ti-6Al-4V particle induced the less periimplant bone loss and the lesssevere implant loosening than UHMWPE particle or Co-Cr-Mo particle did. Conclusion: Variouskinds of wear particles with the same size and same amount can produce different degree of implantloosening.
1999, 14(3):175-179. DOI: 10.3871/j.1004-7220.1999.3.179.
Abstract:Each of the femoral neck fracture of 9 fresh cadaver femora samples was fixed with 3 hollow doublehead compression screws. Biomechanical experiment showed that hollow double head compressionscrew is a more effective internal fixation devise in the treatment of femoral neck fracture. The 3hollow double head compression screw method appeaed to have distinct advantages over themethods by using 3 solid screws or trifin screws in anti-pressure, anti-bending, torsional strengthand torsional rigidity. Statistical analysis showed signigicant difference(p<0.01). Hollow doublehead compression screw method has been performed on 22 patients, and proved to be able to speedup bone formation and recovery of hip or knee joint function after operation. At present, it isdlemed a relatively ideal fixation method in the treatment for fracture of femoral neck. It deserveswides application and more more popularization.
1999, 14(3):180-184. DOI: 10.3871/j.1004-7220.1999.3.184.
Abstract:Limb lengthening by applying the tension-stress stimulated epiphyseal cartilage as a method ofclinical application has been gained popularity recently. Isolated fresh femur bones from 20immature New Zealand white. rabbits were tested under INSTRON machine to investigate theplastic elongation, breaking force and stress relaxation of the biomechanics properties of theepiphyseal cartilage. The result showed that the mean plastic elongation of isolated femur was greatin connection with the tension force increased or persistence time prolonged. The tension relaxationwas decreased in logarithmic curve by time prolonged. Our findings suggest that the low tensilestress had stimulating effects on the epiphyseal cartilage increased in length and no influenced theultimate strength of bone. The Persistence time which tension force performed prolonged, the effectof limb lengthening could be enhanced. It is suitable for the tension force level which higher thanthe original force against stress relaxation. The purpose of this study was to provide theoreticalbasis for clinic bone lengthening.
1999, 14(3):185-192. DOI: 10.3871/j.1004-7220.1999.3.192.
Abstract:To compare the mechanical performance and the effect on cortical microcirculation of CCPC-Fixand CP, three-point bending test and torsion test were carried out with the plates fixed to syntheticbones that have uniform mechanical properties. Transverse osteotomy at middle shaft of both tibiaewas performed in 10 goats and each was fixed with the CCPC-Fix in the right tibiae and the CP inthe left, 4 animals served as control. The chances of conical microcirculation at differentpostoperative phase were evaluated with radioactive microsphere measurement of regional bloodflow. It was found that bending property demonstrated no significant difference between the twokinds of plates. CP has a better torsion property than that of CCPC-Fix when torsional angle was >18. The conical microcirculation beneath the CCPC-Fix was significantly better than that of theCP. At the postoperatve 2, 4 and 9. weeks, the blood flow was as much as 2.5, 9.9 and 2.8 timesrespectively of the latter's. Although a slight difference in torsion property was found between theCCPC-Fix and CP, the CCPC-Fix was significantly beneficial for eliminating the impairment ofconical microcirculation and improving bone healing.