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首页> 外文期刊>Osteoarthritis and cartilage >Effects of ACL interference screws on articular cartilage volume and thickness measurements with 1.5 T and 3 T MRI.
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Effects of ACL interference screws on articular cartilage volume and thickness measurements with 1.5 T and 3 T MRI.

机译：ACL干扰螺钉对1.5 T和3 T MRI测量关节软骨体积和厚度的影响。

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摘要

OBJECTIVE: To assess the effects of interference screws, which are commonly used to surgically fix an anterior cruciate ligament (ACL) graft in the ACL-deficient knee, and magnetic field strength on cartilage volume and thickness measurements with quantitative magnetic resonance imaging (qMRI). METHODS: Five cadaver knees were imaged using a cartilage-sensitive sequence (T1-weighted water-excitation, three-dimensional (3D) fast low-angle shot) on 1.5T and 3T scanners with and without interference screws implanted. The tibiofemoral articular cartilage was segmented and reconstructed from the magnetic resonance images, and volume and thickness measurements were made on the resulting 3D models. RESULTS: Although several load-bearing regions showed significant differences in volume and thickness between magnet strengths, most showed no significant difference between screw conditions. The medial tibial cartilage showed a mean decrease in volume of 5.9% and 8.0% in the presence of interference screws at 3T and 1.5T, respectively. At 3T and 1.5T, the medial tibial cartilage showed a mean decrease in thickness of 7.0% and 12.0%, respectively, in the presence of interference screws. CONCLUSIONS: Caution should be used when interpreting thickness and volume of cartilage at 3T in the presence of interference screws, particularly in the medial tibial compartment. Additionally, 3T and 1.5T qMRI should not be used interchangeably to assess structural changes in tibiofemoral articular cartilage during longitudinal studies.
机译：目的：评估通常用于外科手术将前交叉韧带（ACL）移植物固定在ACL缺损的膝盖中的干涉螺钉的影响，以及通过定量磁共振成像（qMRI）来测量磁场强度对软骨体积和厚度的影响。方法：在1.5T和3T扫描仪上使用软骨敏感序列（T1加权水激发，三维（3D）快速低角度拍摄）对五个尸体膝盖进行成像，无论是否植入干扰螺钉。从磁共振图像中分割并重建胫股关节软骨，并在所得的3D模型上进行体积和厚度测量。结果：尽管几个承重区域在磁体强度之间的体积和厚度方面存在显着差异，但大多数区域在螺杆条件之间均没有显着差异。当在3T和1.5T处有干涉螺钉时，胫骨内侧软骨的体积平均减小了5.9％和8.0％。在3T和1.5T时，在存在干涉螺钉的情况下，胫骨内侧软骨平均厚度分别减小7.0％和12.0％。结论：在存在干涉螺钉的情况下，特别是在胫骨内侧腔中，在解释3T时软骨的厚度和体积时应谨慎。此外，在纵向研究过程中，不应将3T和1.5T qMRI互换使用来评估胫股关节软骨的结构变化。

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