We compared the rheological properties of stress relaxation between the normal and osteoarthritis animal model of lateral collateral ligament and to identify the effects of osteoarthritis on stress relaxation properties of the lateral collateral ligament.The stress relaxation experiments were carried on eight specimens respectively both of normal and pathological on electron Shimadzu universal testing machine.The response rate of stress relaxation experiments was 5%/s.The experimental time was set for 7 200 s,the number of collection was 100 and the experimental data were dealed by one-linear regression analysis method.The results showed that rapid changes of stress relaxation in normal and pathological samples in initially were 600 s,followed by a slow decrease stress,normal amount of stress relaxation was 2.231Mpa at 7 200 s in sick group,the amount of stress relaxation was 2.458 Mpa at 7 200 s.The stress relaxation curve is the relationship between changes in log,the osteoarthritis has impact on the stress relaxation characteristics of the lateral collateral ligament.

BACKGROUND:It is very nscessary for the prevention and treatment of ostaoarthritis(OA)to understand the tensile mechanical properties of lateral collateral ligaments(LCLs)of knee joints with osteoarthritis,while reports on it are still few.OBJECTIVE:To compare the LCL tensile mechanical property indexes of knee joints between normal animals and OA medels established for this purpose,and to provide qualitative and quantitative referential data about effects of OA on the LCL tensile mechanical properties of animal knee joints.DESlGN,TIME AND SETTING:A randomized controlled trial was finished at the Mechanical Expedmental Center of Jilin University from December 20th to 30th in 2008.MATERIALS:A total of 20 male SD rats of 6 months old were divided into a normal control group and a model group,with 10ones in each group.METHOOS:Rats in the model group were copied into OA models.after which test on tensile was performed to each of the ten rats in the two groups at the speed of 5mm/min on Universal Testing Machine,Shimadzu.Data obtained from the test were processed in polynomial though least square method.MAIN OUTCOME MEASURES:Tensile maximum load.maximum displacement,maximum stress,maximum strain and stress-strain curves.RESULTS:The tensile maximum load,maximum stress,maximum displacement and maximum strain in the normal control group and the model group were(12.754±2.795)N,(27.681±5.832)MPa,(2.754±0.707)mm,(11.679±2.373)%and (7.183±1.817)N,(16.162±3.403)MPa,(1.827±0.768)mm,(8.019±2.811)% respectively,from which we could see that each index in the normal control group was greater than that in the model group obviously (P＜0.05).CONCLUSION:The tensile maximum load,maximum stress,maximum displacement and maximum strain all decreased after OA,which indicates that osteoarthritis has certain effects on tensile mechanical properties of LCLs of knee joints as well as stress relaxation.

目前,尽管90~95的骨折能够愈合,但骨不连仍是目前骨折治疗所面临的难题之一.引起股骨干骨折骨不连的诸多原因和机制非常复杂,而治疗股骨干骨折的各种固定方式又有较多选择,因此对此种情况的治疗方法存在颇多争议.

目的:探讨老年患者全髋关节置换术(THR)后深静脉血栓(DVT)的防治。方法:对45例THR术后患者联合应用药物和物理方法,防治DVT的发生。结果:45例中有44例没有发生DVT,有效率达97.7%。结论:应用药物和物理方法联合防治THR术后DVT的发生经济、安全,值得临床推广。

玻璃酸钠(SH)又称透明质酸钠,是关节滑液和软骨基质的主要成分,在关节内起润滑作用,减少组织之间的摩擦,同时发挥弹性作用,缓冲作用于关节软骨的应力,对关节起营养和保护作用.关节腔内注入SH溶液,能明显改善滑膜组织炎性反应,增强关节软骨的愈合与再生,缓解疼痛,增强活动度.近年来,有关文献[1]报道了SH关节腔内注射治疗老年膝关节骨性关节炎和膝关节镜术后SH的补充治疗所取得的良好疗效,但老年髌骨骨折术后关节腔内注射SH疗效目前尚未见报道.本文介绍了我院自2003年以来,对老年髌骨骨折术后的患者行膝关节腔内注射SH溶液的体会,旨在探讨如何促进老年患者术后关节功能的早期修复.

膝关节骨性关节炎(OA)是以关节软骨退变为主要病理特征的慢性临床综合征,它多发于中老年人.玻璃酸钠以其特有的化学本质,保护滑膜及关节软骨,润滑、稳定、消炎、镇痛等作用来改善关节内环境,越来越受到大家的认可.本院从1999年10月～2003年6月,应用玻璃酸钠关节腔内注射治疗老年人膝关节OA 126例,取得满意效果.

1992年3月至2000年1月收治膝关节周围骨巨细胞瘤患者16例,采用彻底切刮病灶后氩气束综合电刀反复烧灼残腔,自体髂骨T型或倒T型植骨,L-梯形加压钢板内固定治疗,经6个月至7年随访,取得满意疗效.

本文报告1991～1996年15例膝关节开放性骨折应用内固定治疗的结果,探讨膝关节开放骨折的治疗原则与方法.