Smith D K
Department of Diagnostic Radiology/SGHRD, Wilford Hall United States Air Force Medical Center, Lackland Air Force Base, TX 78236.
AJR Am J Roentgenol. 1993 Jul;161(1):119-25. doi: 10.2214/ajr.161.1.8517289.
Three-dimensional Fourier transform MR imaging techniques can produce much thinner contiguous slices than are obtainable with standard two-dimensional Fourier transform MR imaging techniques. The improved spatial resolution and capabilities for interactive multiplanar displays allow improved visualization of small, complex anatomic structures such as the carpal ligaments. The purposes of this study were twofold: (1) to determine if the dorsal carpal ligaments can be visualized consistently with three-dimensional Fourier transform MR imaging techniques with multiplanar reconstructions and (2) to evaluate the size, shape, orientation, and right-to-left symmetry of the dorsal carpal ligaments in both wrists of 25 asymptomatic volunteers as a basis for future comparison when patients with suspected ligament injuries are seen.
Both wrists of 25 asymptomatic volunteers were imaged with a three-dimensional Fourier transform MR imaging technique with commercially available equipment. A three-dimensional graphic workstation was used to reconstruct oblique two-dimensional images in the long axes of the radiotriquetral and dorsal intercarpal ligaments in all 50 wrists. The size, shape, orientation, and right-to-left symmetry were determined by the author using the reconstructed two-dimensional images.
The radiotriquetral ligament and dorsal intercarpal ligament were visualized in all 50 wrists. The radiotriquetral ligament consisted of a single band arising from the distal radius (next to Lister's tubercle) in 84% and had dual origins from the styloid process of the radius and Lister's tubercle in 16%. The dorsal intercarpal ligament consisted of a single broad band in 14% of wrists, was a branched structure with separate triquetroscaphoid and triquetrotrapezial fascicles in 44%, had completely separate triquetroscaphoid and triquetrotrapezial fascicles in 38%, and had a triquetrotrapezial fascicle larger than the triquetroscaphoid fascicle in 4%. The dorsal intercarpal ligamentous anatomy was symmetric in 16 of 25 volunteers.
The major dorsal carpal ligaments can be visualized consistently when using three-dimensional Fourier transform MR imaging techniques and multiplanar reconstructions. The dorsal carpal ligaments are usually symmetric in size and morphology; therefore, MR images of the contralateral wrist may be used for comparison with MR images of a patient's injured wrist. The size and shape of the dorsal carpal ligaments are described for comparison with findings in patients who have suspected ligamentous injuries.
与标准的二维傅里叶变换磁共振成像技术相比，三维傅里叶变换磁共振成像技术能够生成更薄的连续层面。空间分辨率的提高以及交互式多平面显示功能，使得诸如腕关节韧带等小而复杂的解剖结构能够得到更好的显示。本研究有两个目的：（1）确定采用三维傅里叶变换磁共振成像技术及多平面重建能否始终清晰显示腕背侧韧带；（2）评估25名无症状志愿者双腕腕背侧韧带的大小、形态、走行及左右对称性，为日后观察疑似韧带损伤患者时进行对比提供依据。
使用市售设备，采用三维傅里叶变换磁共振成像技术对25名无症状志愿者的双腕进行成像。利用三维图形工作站，在所有50个腕关节中重建桡三角韧带和腕背间韧带长轴方向的斜位二维图像。作者通过重建的二维图像确定韧带的大小、形态、走行及左右对称性。
50个腕关节中均清晰显示了桡三角韧带和腕背间韧带。84%的桡三角韧带由一条起自桡骨远端（靠近Lister结节）的束带构成，16%的韧带起自桡骨茎突和Lister结节。14%的腕关节中腕背间韧带由一条宽束带构成，44%为分支结构，有单独的三角舟韧带和三角大多角骨韧带束，38%的三角舟韧带和三角大多角骨韧带束完全分开，4%的三角大多角骨韧带束大于三角舟韧带束。25名志愿者中，16人的腕背间韧带解剖结构对称。
采用三维傅里叶变换磁共振成像技术及多平面重建能够始终清晰显示主要的腕背侧韧带。腕背侧韧带的大小和形态通常是对称的；因此，对侧腕关节的磁共振图像可用于与患者受伤腕关节的磁共振图像进行对比。描述了腕背侧韧带的大小和形态，以便与疑似韧带损伤患者的检查结果进行对比。
