常规超声结合剪切波弹性成像技术对兔坐骨神经挤压伤的定量评估

目的探讨常规超声结合剪切波弹性成像技术对兔坐骨神经挤压伤定量评估的价值。方法将40只健康雄性新西兰白兔随机分为4组,每组10只,分别为挤压伤2、4、8周组和对照组(无挤压伤)。应用常规超声、剪切波弹性成像技术检测手术侧坐骨神经及小腿三头肌,分别得到不同时间点损伤神经及失神经支配肌肉的厚度、硬度变化指标,并与组织病理学参数进行比较。应用组内相关系数比较测试者之间的一致性。结果损伤神经内径在术后2周较对照组明显增厚[(1.65±0.34) mm比(0.97±0.15) mm,P=0.00],在术后8周恢复接近正常水平[(1.12±0.18) mm比(0.97±0.15) mm,P=0.06],但神经弹性模量随时间变化逐渐增高[2周:(14.77±2.53) kPa;4周:(19.12±3.46) kPa;8周:(28.39±5.26) kPa],各时间点较对照组[(8.75±1.02) kPa]差异均有统计学意义(P均=0.00);病理表现为神经组织内大量胶原纤维增生。失神经支配小腿三头肌厚度逐渐减小,弹性模量于术后2周内减低,2周后逐渐增加,术后8周显著增加(P均=0.00);病理学表现...

Quantitative Evaluation of Sciatic Nerve Crush Injury with Conventional Ultrasound Combined with Shear-wave Elastography in Rabbit Models

Objective To explore the value of conventional ultrasound combined with shear-wave elastography in the quantitative evaluation of sciatic nerve crush injury in rabbit models. Methods Forty healthy male New Zealand white rabbits were randomly divided into four groups (n=10 in each group):three crush injury (CI) groups (2,4,and 8 weeks after crush) and control group (without injury). The thickness and stiffness of the crushed sciatic nerves and denervated triceps surae muscles were measured at different time points and compared with histopathologic parameters. Inter-reader variability was assessed with intraclass correlation coefficients. Results Compared with the control group,the inner diameters of the sciatic nerves significantly increased in the 2-week CI group [(1.65±0.34) mm vs. (0.97±0.15) mm,P=0.00] but recovered to the nearly normal level in the 8-week CI group [(1.12±0.18) mm vs. (0.97±0.15) mm,P=0.06];however,compared with control group [(8.75±1.02)kPa],the elastic modulus of the nerves increased significantly in all the CI groups [2-week:(14.77±2.53) kPa;4-week:(19.12±3.46) kPa;and 8-week:(28.39±5.26) kPa;all P=0.00];pathologically,massive hyperplasia of collagen fibers were found in the nerve tissues. The thickness of denervated triceps surae muscle decreased gradually,and the elastic modulus decreased 2 weeks after injury but increased gradually in the following 6 weeks;pathologically,massive hyperplasia of collagen fibers and adipocytes infiltration were visible,along with decreased muscle wet-weight ratio and muscle fiber cross-sectional area. The inter-reader agreements were good. Conclusion Conventional ultrasound combined with shear-wave elastography is feasible for the quantitative evaluation of the morphological and mechanical properties of crushed nerves and denervated muscles.