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目的:研究在不同体位骶髂关节周围韧带的应力分布与作用。方法:建立骶髂关节与骨盆的三维有限元模型,模拟单腿站立位、双腿站立位和坐位等三种工况,计算关节周围韧带的应力分布。结果:坐位、双腿站立位和单腿站立位三者中,以单腿站立位时骶髂关节周围韧带的应力值为大,坐位晨骶髂关节周围韧带应力最小,提示坐位有利于骶髂关节的休息,而单腿站立位易造成骶髂关节的疲劳。结论:本研究结果提示骶髂关节周围的韧带通过提高张力水平,在维持关节的不同体位、阻止脱位的趋势方面具有重要意义。 相似文献
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目的 研究在不同体位骶髂关节周围韧带的应力分布与作用。方法 建立骶髂关节与骨盆的三维有限元模型 ,模拟单腿站立位、双腿站立位和坐位等三种工况 ,计算关节周围韧带的应力分布。结果 坐位、双腿站立位和单腿站立位三者中 ,以单腿站立位时骶髂关节周围韧带的应力值为大 ,坐位时骶髂关节周围韧带应力最小 ,提示坐位有利于骶髂关节的休息 ,而单腿站立位易造成骶髂关节的疲劳。结论 本研究结果提示骶髂关节周围的韧带通过提高张力水平 ,在维持关节的不同体位、阻止脱位的趋势方面具有重要意义 相似文献
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骨盆韧带损伤对骶髂关节稳定性影响的生物力学研究 总被引:3,自引:0,他引:3
目的 探讨骨盆韧带损伤对骶髂关节稳定性的影响,为骨盆骨折的临床治疗提供理论依据. 方法取骨盆标本10具,完整保留关节及韧带结构,左侧组逐级离断耻骨联合、骶棘韧带、骶结节韧带、骶髂前韧带及骶髂前关节囊、骶髂骨间韧带,右侧组逐级离断耻骨联合、骶髂后长、后短韧带、髂腰韧带、骶髂骨间韧带,模拟人体单足站立位,力学机上给予轴向加载,测量并记录骶骨相对于髂骨的垂直位移及矢状面骶骨旋转角度(角移位). 结果左侧力学试验中,仅切断耻骨联合周围韧带、骶结节韧带,骶骨垂直位移、骶骨角位移,差异无统计学意义(P>0.05).逐步切断骶髂前韧带、骶髂骨间韧带,骶骨的垂直位移数值由完整骨盆测量的(4.144±0.538)mm增至(5.853±0.368)mm;骶骨的旋转角度由骨盆完整时的0.226°±0.061°增至0.616°±0.086°,差异有统计学意义(P<0.05).右侧力学试验中,逐次切断骶髂关节后部韧带,骶骨的垂直位移数值由完整骨盆测量的(3.610±0.696)mm增至(6.825±0.565)mm;骶骨的旋转角度由骨盆完整时的0.271°±0.094°增至0.746°±0.192°,差异有统计学意义(P<0.05).结论 耻骨联合及其周围韧带的损伤对骶髂关节的稳定性无显著性影响;骶结节韧带、骶棘韧带对限制骶骨的角位移有很大作用;骨间韧带对骶髂关节稳定性的作用较大;骶髂后韧带与骨间韧带共同组成了骶髂关节后部韧带复合体,是骶髂关节周围韧带中的重要部分. 相似文献
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骶髂关节半脱位误诊原因分析 总被引:1,自引:0,他引:1
骶髂关节半脱位,由GoldwaitOsgood于1905年首先提出这一概念。因骶髂关节的解剖结构较为稳定,关节周围又有强大的韧带固定,因损伤造成骶髂关节半脱位并不多见,故易被忽视而漏诊。近年来我们曾收治了在外长期误诊误治的本病患者5例,均经手法治疗而... 相似文献
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骶髂关节是微动关节,其稳定性全赖周围的五组韧带,也有称之为“韧带关节”。一般情况下,没有强大外力是不易错缝的,若遭受强大外力时,虽有凸凹不平的关节面相互嵌卡限制,也难免出现微小错动而不能自复,遂成本病。 相似文献
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骶髂关节复合体(Sacroiliac complex),包括骶髂关节(Sacroiliac joint,SIJ)、SIJ周围韧带、骶棘韧带、骶结节韧带及骨盆底的肌肉和筋膜,Harrison等提出SIJ整体系统。SIJ是躯干与下肢负荷传递的枢纽,占整个骨盆功能的60%,治疗效果对骨盆功能的恢复有决定意义。高能损伤的骨盆骨折多合并SIJ骨折脱位,损伤骶髂复合体。许多下腰痛由单侧或双侧SIJ综合征引起,亦称为SIJ功能紊乱;妊娠后妇女因SIJ半脱位或全脱位,易患妊娠相关性骨盆痛。骶髂螺钉固定在生物力学上优于外固定,等同于骶骨棒和张力带钢板固定,能达到与完整骨盆相似的生物力学结果。 相似文献
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不稳定骨盆损伤中骶髂关节脱位的临床解剖研究 总被引:7,自引:0,他引:7
目的分析骶髂关节在不同脱位情况下耳状关节面接触面积的变化。方法采用30具除去韧带结构的正常成人干燥左侧半骨盆标本,男女各15具,年龄20~57岁。对标本的骶髂关节进行螺旋CT扫描,构建骶髂关节模型图像,图像输入到Photoshopll.0图像处理软件,应用计算机定量测量骶骨侧及髂骨侧关节面图像的长度及面积。将骶骨固定于标本平台上,分别向后、上及后上3个方向移动髂骨,模拟不稳定性骨盆骨折中旋转不稳及垂直不稳,造成骶髂关节的三维空间移位,相对位移分别依次递增5mm,同时进行螺旋CT扫描,直至骶髂关节完全脱位。在每一种模拟移位中,使用Photoshopll.0软件由计算机测量骶髂关节髂骨与骶骨关节面的接触面积。结果正常情况下,男性骶髂关节的耳状关节面接触面积是1138.3mm^2,女性为992.5mm^2,男性比女性大12.8%(P〈0.05)。当髂骨向后上方移位时,骶髂关节髂骨侧与骶骨侧的接触面积最小,其次是向后及向上移位(P〈0.05)。结论骶髂关节在不同移位情况下,髂骨侧与骶骨侧关节面接触面积变化较大,有较明显的性别差异,这对骶髂关节损伤复位内固定或关节融合术有临床指导意义。 相似文献
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We repeated some of our own previous experiments, as well as some of Torzilli's recent experiments (11) on which he bases his conclusions relating to a nonexchangeable "trapped water" in cartilage. We are unable to confirm Torzilli's findings. We observed partition coefficients for 3H.HO very close to unity. That both the extrafibrillar and most of the intrafibrillar water is freely exchangeable and behaves as available water towards small solutes has been independently shown (3) for other collagenous tissues. All the different permutations of partition experiments have yielded results that are fully consistent with our original picture of the very major fraction of cartilage water being free. 相似文献
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EditorIt is a common misconception that turning off thevaporizer while leaving the fresh gas flow (FGF) on, during 相似文献
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Alain C McDonald KL Kovacevic N McIntosh AR 《Cerebral cortex (New York, N.Y. : 1991)》2009,19(2):305-314
Goal-directed attention to sound identity (what) and sound location (where) has been associated with increased neural activity in ventral and dorsal brain regions, respectively. In order to ascertain when such segregation occurs, we measured event-related potentials during an n-back (n = 1, 2) working memory task for sound identity or location, where stimuli selected randomly from 3 semantic categories (human, animal, music) were presented at 3 possible virtual locations. Accuracy and reaction times were comparable in both "what" and "where" tasks, albeit worse for the 2-back than for the 1-back condition. The partial least squares analysis of scalp-recorded and source waveform data revealed domain-specific activity beginning at about 200-ms poststimulus onset, which was best expressed as changes in source activity near Heschl's gyrus, and in central medial, occipital medial, right frontal and right parietal cortex. The effect of working memory load emerged at about 400-ms poststimulus and was expressed maximally over frontocentral scalp region and in sources located in the right temporal, frontal and parietal cortices. The results show that for identical sounds, top-down effects on processing "what" and "where" information is observable at about 200 ms after sound onset and involves a widely distributed neural network. 相似文献
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