共查询到16条相似文献,搜索用时 62 毫秒
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目的评估先进人工韧带加强系统韧带(1igament advancement reinforcement system,LARS)重建前交叉韧带(anterior cruciate ligament,ACL)术后1~5年膝关节功能。方法选择符合标准的LARS人工韧带关节镜下重建ACL患者36例(36膝),对其进行Lysholm、Tegner评分及IKDC评级等多指标回顾性分析。结果 LARS人工韧带重建ACL术后第1年、第3年及第5年的Lysholm、Tegner评分及IKDC评级明显高于术前(P0.01);而术后第1年、第3年及第5年的Lysholm、Tegner评分及IKDC评级之间差异无统计学意义(P0.05)。最终术后5年随访优良率为97.2%。结论 (1)LARS人工韧带重建ACL能较好地恢复膝关节稳定性及功能,对于膝关节前交叉韧带的重建是一种有效的移植物。(2)术后5年内关节功能稳定,无较大变化,说明LARS人工韧带在5年随访期内无严重的性能减退。(3)长期疗效是否仍然能保持术后中短期随访的优良结果,需继续长期随访。 相似文献
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针对人工韧带在膝关节腔内复杂力学环境作用下出现移植失效的问题,研制了一种人工韧带疲劳测试装置,由拉伸运动模块、扭转运动模块、屈曲运动模块和恒温液体回流系统组成。通过筛选人体正常行走过程中拉伸位移、扭转角度及屈曲角度等参数对人工韧带试样进行疲劳测试以及耐疲劳性能评价。结果表明:纤维和纱线之间的相互摩擦损伤是人工韧带试样的主要疲劳损伤模式,其拉伸断裂性能在疲劳测试后有一定的损失,归一化的拉伸模量随时间以指数函数形式下降;试样中各条大分子链在疲劳测试过程中会受到拉、压、扭、弯等一系列多个方向载荷的共同破坏作用,最终导致结晶度下降。 相似文献
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人体膝关节是人类运动受伤频发的部位,对于膝关节韧带损伤常用的治疗方法是自体移植物和异体移植物的移植。但自体移植物与异体移植物存在一定的缺陷和来源少等问题,这使得人工韧带移植治疗方法具有较大的发展前景。采用三种不同线密度的涤纶纱线设计并织造12种管状试样,对试样进行力学性能测试。试验结果表明:当纱线线密度为22.2 dtex、经纱数为120根、每筘穿入数为6时,人工韧带的强力为827 N、断裂伸长率为57%,机织管状人工韧带的力学性能曲线接近于人体韧带。可进一步研究人工韧带的耐持久性及生物相容性,使人工韧带成为人体韧带的理想移植物。 相似文献
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In this study, artificial anterior cruciate ligaments (ACLs) were manufactured using braiding and knitting processes. These artificial ligaments were designed to match the mechanical requirements of a native human ACL, including the fatigue performance. The effect of cyclic loading on the mechanical performance of the artificial ligaments was studied at different deformation rates (slow: 2% per second, medium: 50% per second and fast: 100% per second). The primary results showed that the deformation rate had no significant effect on the ultimate tensile strength, strain or stiffness. Single tensile loading to failure performed for each prosthesis before and after cyclic loading allowed the determination of its effect on the mechanical performance of the artificial ligaments. The increase in the number of cycles decreased the maximum strain and the ultimate tensile strength but had no significant effect on the stiffness. At 60,000th cycle, the braided prosthesis presented a better performance with a lower residual deformation compared with the knitted prosthesis. 相似文献
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In this work, artificial anterior cruciate ligaments were manufactured using braiding process. The mechanical behaviour of circular braids under tensile loads was studied. These braids were manufactured from different yarns and materials. A study of the effect of yarns characteristics and the machine parameters on the braid mechanical properties was done. Predictive models of the braid mechanical response based on the constituent yarn characteristics and the machine parameters have been developed. The last part of this study has been devoted to optimise the braid mechanical properties to be close to those of native ligament. 相似文献
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目前,人工智能被广泛地应用在各行各业中,已经成为纺织技术开发与创新的重要组成部分,能够对纺织行业的现代化发展产生巨大的推动作用。因此,围绕基于人工智能的纺织技术开发进行讨论,在了解人工智能应用状况的同时,对应用人工智能进行纺织技术开发的具体途径进行探讨和描述,希望能够进一步提升人工智能的应用效果。 相似文献
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