Department of Radiology, National Institute for Cancer Research, 16132 Genoa, Italy.
Magn Reson Imaging. 2010 Nov;28(9):1319-26. doi: 10.1016/j.mri.2010.06.009. Epub 2010 Aug 4.
This study was done to test a series of MR sequences for evaluating the sciatic nerve after total hip arthroplasty (THA).
The study protocol was approved by the institutional review board. Informed consent was obtained from all patients. Twenty-five patients (11 men and 14 women mean age: 62.3±5.7 years) with THA were included in this prospective study. MRI protocol included sequences that were preliminarily tailored for nerve imaging in patients with THA: proton density (PD)-weighted turbo SE, T1-weighted turbo SE (TSE) 3 mm thickness, T1-weighted turbo SE (TSE) 6 mm thickness, T1-weighted turbo SE with high bandwidth (TSE hBW), T2- weighted TSE, T2-weighted with fat saturation and short-tau inversion recovery (STIR). For each sequence, we evaluated the visibility of the sciatic nerve using a semiquantitative score (0=total masking; 1=insufficient visibility; 2=sufficient visibility; 3=optimal visibility). The sum of the scores given to each sequence was divided by the maximal sum, obtaining a percentage visibility index. Friedman and sign tests were used for statistical analysis.
MR examination time was approximately 40 min. No patients reported pain, heat or symptoms related to nerve stimulation. The visibility index ranged between 88% and 70% for the first four sequences. The T1-weighted TSE hBW sequence had the best visibility index (P<.05). The visibility indexes of the first four sequences were significantly higher (P<.004, sign test) than those of the remaining three sequences.
The sciatic nerve could be studied at 1.5 T in patients following THA. The nerve is better visualized with T1-weighted TSE hBW sequences. On T2-weighted sequences and STIR, the visibility of the nerve is low.
本研究旨在测试一系列磁共振（MR）序列，以评估全髋关节置换术（THA）后坐骨神经。
本研究方案获得了机构审查委员会的批准。所有患者均获得了知情同意。本前瞻性研究纳入了 25 例接受 THA 的患者（11 名男性，14 名女性；平均年龄：62.3±5.7 岁）。MRI 方案包括初步针对 THA 患者神经成像定制的序列：质子密度（PD）加权涡轮 SE、T1 加权涡轮 SE（TSE）3mm 厚度、T1 加权涡轮 SE（TSE）6mm 厚度、高带宽 T1 加权涡轮 SE（TSE hBW）、T2 加权 TSE、T2 加权带脂肪饱和和短回波反转恢复（STIR）。对于每个序列，我们使用半定量评分（0=完全遮蔽；1=不足够可视；2=足够可视；3=最佳可视）评估坐骨神经的可视性。将每个序列的评分总和除以最大总和，得到可视性指数。采用 Friedman 和符号检验进行统计学分析。
MR 检查时间约为 40 分钟。没有患者报告疼痛、发热或与神经刺激相关的症状。前四个序列的可视性指数在 88%至 70%之间。T1 加权 TSE hBW 序列具有最佳的可视性指数（P<.05）。前四个序列的可视性指数显著高于（P<.004，符号检验）其余三个序列。
在接受 THA 的患者中，1.5T 可研究坐骨神经。T1 加权 TSE hBW 序列可更好地显示神经。在 T2 加权序列和 STIR 上，神经的可视性较低。
