排序方式： 共有16条查询结果，搜索用时 125 毫秒
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目的：探讨髌前皮下囊（SPB）滑囊炎的MRI表现特征和鉴别诊断。方法：回顾性分析临床随访证实的28例髌前皮下囊滑囊炎的0．35TMRI资料。结果：27例患者有急慢性膝前损伤史,1例有强直性脊柱炎病史。以膝前疼痛肿胀为主要临床表现。MRI表现为髌前皮下紧贴髌骨的扁圆形影,TlWI为中低、T2WI为中高信号。大小：2．8cm×0．5cm×1．9cm～14．8cm×3．6cm×9．3cm,平均6．6cm×2．0cm×3．7cm。MRI显示以轴位为佳。结论：认识髌前皮下囊滑囊炎的临床及MRI表现特征有助于早期正确诊断该病。 相似文献
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H. Broers H. Hemken T. Luhmann P. Ritschl 《ISPRS Journal of Photogrammetry and Remote Sensing》2002,56(5-6)
For the total replacement of the knee joint, the precise reconstruction of the mechanical axis is significantly determined by the alignment of the cutting tool with respect to the rotation centre of the femur head. Operation techniques supported by navigation allow for the precise three-dimensional location of the hip centre by cinematic analysis.Recent results permit the reconstruction of the femur axis to be better than 0.7°. Therefore, conventional verification methods such as the post-operative recording of the complete leg are not suitable due to their limited system accuracy of about 2°.As the femur head cannot be accessed directly during the operation, an X-ray method has been used to verify alignment. The paper presents a method and the results achieved for the calibration of a C-arm system by introducing photogrammetric parameters. Since the method is used during operation, boundary conditions such as minimal invasive surgical intervention and sterility have been considered for practical applications of patients. 相似文献
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目的：探讨髂胫束摩擦综合征的低场MRI表现特征。方法：回顾性分析临床随访证实的12例髂胫束摩擦综合征的临床及0．35T磁共振成像（MRI）资料。结果：全部患者均有膝外侧疼痛,以跑步等运动时为著。MRI急性期及亚急性期以髂胫束肿胀、信号增高,髂胫束内侧和（或）外侧肿胀积液为主要表现（本组4例）;慢性期以髂胫束增厚、伴髂胫束内外侧积液为主要表现（本组8例）。MRI显示以冠状位为佳。结论：认识髂胫束摩擦综合征的临床及低场MRI表现特征有助于早期正确诊断。 相似文献
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目的：探讨计算机辅助膝关节内外翻畸形分析和精确矫形的新方法,评价计算机辅助技术在膝内外翻畸形治疗中的价值。方法：2010年9月至2013年9月共收治膝内外翻畸形患者14例16膝;膝内翻8例10膝,膝外翻 6 例 6膝。术前根据计算机辅助测量结果,选择合适的截骨部位、截骨角度,通过 e-PAC 2000影像工作站设计个性化辅助截骨模板,最后采用计算机模拟设计膝关节内外翻畸形的精确截骨和矫形的手术过程,术中根据计算机辅助模拟的手术方案截骨矫形,HSS 评分标准评定术前术后的膝关节功能,术后复用 e-PAC2000影像工作站评价矫形效果。结果：所有患者均得到随访,随访时间3～12个月,术后早期复用 e-PAC 2000影像工作站证实：膝内外翻畸形完全矫正,下肢负重力线恢复正常。根据膝关节 HSS 评分标准：术前（52.6±13.1）分,术后（86.2±8.9）分,传统方法组与计算机辅助矫形组相比,术后矫形效果确切。随访期间未发现有内固定失败,骨不愈合,膝内外翻复发,无神经血管损伤等并发症,其中1例患者术后2周出现感染,给予伤口清创及置管冲洗引流加换药治疗后好转,随访期间未发现骨不愈合。结论：采用计算机辅助膝内外翻分析和精确矫,将膝内外翻畸形的精确矫形提升到数字化水平,具有更精确,更可靠、更良好的治疗效果。 相似文献
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Wenping Gong Hongwei Huang C. Hsein Juang Lei Wang 《Marine Georesources & Geotechnology》2017,35(2):157-169
The shoring system that consists of soldier piles and anchor tiebacks is often used in deep excavations in sandy deposits. However, uncertainties often exist in the design of such shoring systems. In this article, a simplified-robust geotechnical design method is proposed to account for these uncertainties in the shoring system design. Specifically, for a given deep excavation, uncertain soil parameters and surcharges are treated as noise factors, and the parameters of soldier piles and tieback anchors are treated as design parameters. Robust design is then implemented as a multiobjective optimization problem, in which the design robustness is sought along with cost efficiency and safety requirements. A trade-off between design robustness and cost efficiency exists and the optimization usually leads to a Pareto front. By applying the knee point concept, the most preferred design that meets the safety requirements and yields the best compromise between design robustness and cost efficiency can be identified on the Pareto front. Improvements made to the existing robust geotechnical design method include an efficient formulation of the design robustness and a new procedure for finding the most preferred design in the design pool. The new simplified-robust geotechnical design method is illustrated with a real-world excavation case study. 相似文献