目的探讨MRI对膝关节盘状半月板撕裂的诊断价值。方法回顾性分析经关节镜证实的74例膝关节盘状半月板损伤的MRI影像学资料和临床资料,分析其MRI征象,将74例膝关节盘状半月板损伤分为无撕裂、单纯水平撕裂、放射状撕裂、联合水平撕裂、复杂撕裂及纵向撕裂六组,与关节镜检查结果相对照,计算MRI诊断盘状半月板各型撕裂的敏感性、特异性及阳性和阴性预测值。结果 MRI检查诊断盘状半月板撕裂的敏感性为98.55%,特异性为100%,阳性预测值为98.55%,阴性预测值为83.33%。其中诊断单纯水平撕裂、放射状撕裂、联合水平撕裂、复杂撕裂及纵向撕裂的敏感性分别为95.00%、83.34%、90.94%、84.61%、87.5%,特异性分别为81.48%、95.23%、95.23%、98.36%、100%。结论 MRI可较好的对膝关节盘状半月板撕裂进行诊断,为临床制定合理的治疗方案提供依据。

Objective To explore the value of magnetic resonance imaging (MRI) in the diagnosis of tear of discoid meniscus. Methods MRI images and the clinical data of 74 patients were analyzed retrospectively, MRI signs of discoid meniscus were analyzed. Tears were classified into six groups:no tear, simple horizontal tear, radial tear, combined horizontal tear, complex tear and longitudinal tear. Sensitivity, specificity, positive and negative predictive values of MRI were calculated for each group separately. Results MRI was found to be 98.55% sensitive and 100% specific for determining the presence or absence of a tear with a positive predictive value of 98.55%and a negative predictive value of 83.33%. The sensitivities were 95.00% for simple horizontal, 83.34% for radial, 90.94% for combined horizontal, 84.61% for complex and 87.5% for longitudinal tears, whereas the specificities were 81.48%for simple horizontal, 95.23%for radial, 95.23%for combined horizontal, 98.36% for complex

研究了硫化剂品种、双酚AF用量、促进剂BPP用量、补强剂品种及炭黑N990用量对不同测试温度下氟橡胶撕裂强度的影响,采用核磁共振法测定了不同温度下氟橡胶硫化胶的交联密度,研究了氟橡胶的高温撕裂强度与其交联密度间的关系。结果表明,随着测试温度的增加(25℃增加到200℃),不同配方的氟橡胶的撕裂强度均明显降低。在100~200℃温度范围内,双酚AF/BPP硫化的氟橡胶的撕裂强度高于过氧化物或胺类硫化氟橡胶的撕裂强度。随着双酚AF用量的增大,氟橡胶的常温撕裂强度明显降低,而高温撕裂强度略有下降。促进剂BPP用量增大,氟橡胶的常温和高温撕裂强度均变化不大。几种补强剂中,沉淀法白炭黑补强氟橡胶在200℃时的撕裂强度仅为25℃时撕裂强度的0.6%。测试温度从25℃升至200℃,炭黑N990补强氟橡胶的撕裂强度降低幅度较小,随着N990用量的增大,氟橡胶的常温撕裂强度增幅明显,而高温撕裂强度略有提高。测试温度升高,氟橡胶硫化胶的交联密度减小,同时撕裂强度也降低,双酚硫化时,在相同测试温度下,氟橡胶的交联密度越小,撕裂强度越大。

The effect of varieties of curing agent and reinforcing agent,amount of Bisphenol AF, accelerator BPP and carbon black N990 on the tear strength of fluororubber were investigated.The crosslink density of fluororubber was determinated using nuclear magnetic resonance method in order to investigate the relationship between the crosslink density and the tear strength of fluororubber. The results showed that the tear strength of fluororubber significantly reduced with the test tempera-ture increasing from 25℃ to 200℃.The tear strength of fluororubber cured by Bisphenol AF/BPP was higher than that cured by peroxide or amine with the test temperature from 100℃ to 200℃.With the increasing of the amount of Bisphenol AF,high-temperature tear strength of fluororubber de-creased,but the normal-temperature and high-temperature tear strength changed little with the in-creasing of accelerator BPP content.The tear strength of fluororubber reinforced by precipitated silica at 200℃ was o

目的探讨膝关节前交叉韧带撕裂的低场MRI应用价值。方法回顾性分析该院2013年1月—2014年2月膝关节前交叉韧带撕裂的56例患者的临床及MRI影像学资料,以关节镜检查为诊断标准,计算低场MRI在诊断膝关节前交叉韧带撕裂的准确性,并分析可能存在的影响因素。结果经关节镜检查诊断为部分撕裂29例,有23例相符,灵敏度为79.31%;关节镜诊断完全撕裂27例,有25例与其相一致,灵敏度为92.59%,完全撕裂诊断灵敏度高于部分撕裂诊断,两者相比差异有统计学意义(P0.05)。结论低场MRI在诊断膝关节前交叉韧带撕裂中准确率很高,对临床怀疑膝关节前交叉韧带撕裂时,应及时、首选MRI检查,为临床治疗提供客观的影像学依据。

Objective To study the application value of low field MRI of knee anterior cruciate ligament tear. Methods The clini-cal and MRI imaging data of 56 cases of patients with knee anterior cruciate ligament tear admitted in our hospital from January, 2013 to February, 2014 were analyzed retrospectively, the accuracy of low field MRI in the diagnosis of knee anterior cruciate liga-ment tear with arthroscopy for diagnostic criteria, and the possible influencing factors were analyzed. Results 29 cases were diag-nosed as partial tearing by arthroscopy, there were 23 cases of compliance, the sensitivity was 79.31%;27 cases were diagnosed as complete tearing, there were 25 cases of compliance, the sensitivity was 92.59%, the diagnostic sensitivity of complete tearing was higher than that of partial tearing, the difference was statistically significant (P<0.05). Conclusion The accuracy rate of low field MRI in the diagnosis of knee anterior cruciate ligament tear is very high. For patients with s

目的总结分析半月板撕裂在低场强磁共振（MR）中的影像特征,探讨低场强磁共振成像（MRI）对半月板撕裂的鉴别诊断及在基层医院的临床应用价值。方法回顾性分析2011年8月～2013年1月44例经关节镜或手术证实为膝关节半月板撕裂患者的低场强MRI图像。结果 44例病人中,半月板撕裂的MR图像中清晰显示半月板内的线状、条状、星形裂隙样等各序列高信号及半月板截断、半月板游离体及半月板破裂征象。结论低场强MRI可以精确地显示膝关节半月板撕裂及撕裂情况,可以明确排除类半月板撕裂的假阳性,在基层医院低场强MR对于膝关节半月板撕裂有重要的临床应用价值。

Objective To summarize the imaging features of meniscus tear during the scanning process of low-ifeld MRI and explore the diagnosis value and application value of low-ifeld MRI in meniscal tear in primary hospitals. Methods The low-ifeld MRI images of 44 patients treated from August 2011 to January 2013 were analyzed retrospectively. All the patients were diagnosed as knee meniscus tear with arthroscopy or surgery. Results The MRI images of all the patients clearly showed the high signals of various sequences including linear shapes, strips and star-like cracks in meniscus as well as the signs including meniscus truncation, meniscus loose bodies and meniscus rupture. Conclusion Low-field MRI could accurately display the features and degrees of knee meniscus tear and explicitly exclude false positive cases of meniscus tear, which indicates that low-ifeld MRI can play an important role in diagnosing knee meniscus tear in primary hospitals.

目的：探讨MRI对于膝关节半月板损伤的诊断价值。方法对37例半月板损伤的病例做回顾性分析，分析MRI影像表现，并对MRI诊断结果与关节镜结果进行对比分析，以关节镜下半月板损伤类型作为金标准。结果 MRI诊断与关节镜诊断准确度为93.24%；灵敏度为91.67%；特异度为94.74%,MRI诊断纵向撕裂诊断准确度为92.31%；斜行撕裂诊断准确度为28.58%；水平撕裂诊断准确度为75.76%；放射状撕裂诊断准确度为75.00%；符合性撕裂诊断准确度为33.33%；通装撕裂诊断准确度100%。结论 MR I对于半月板损伤的诊断及撕裂类型的诊断有较高的诊断价值，并且能够对半月板损伤治疗方法的选择做出一定的指导。

Objective To explore the diagnosis value of MRI for knee joint meniscus injury.Methods37 cases of meniscus injury cases were retrospectively analyzed, the performance analysis of MRI image, and the MRI diagnosis and arthroscopic results, this paper compares and analyzes under arthroscopic meniscal injury types as the gold standard.ResultsThe accuracy of MRI diagnosis is 93.24%; Sensitivity is 91.67%; speciifcity is 94.74%. MRI in the diagnosis of longitudinal tear diagnostic accuracy is 92.31%; Diagonal line tear diagnostic accuracy is 28.58%; Horizontal tear diagnostic accuracy is 75.76%; Radial tear diagnostic accuracy is 75.00%; Conformity tear diagnostic accuracy is 33.33%; Links tear diagnostic accuracy of 100%. Conclusion MR for the diagnosis of meniscal injury and tear the diagnosis of type had higher diagnostic value, and to the choice of meniscus injury treatment to make certain guidance.