MR imaging of the knee: preliminary results with a 3DFT GRASS pulse sequence

AJR Am J Roentgenol. 1988 Mar;150(3):597-603. doi: 10.2214/ajr.150.3.597.

Abstract

The knees of 17 patients (18 extremities) with possible meniscal, cruciate ligament, and articular cartilage abnormalities were examined with a three-dimensional Fourier transform (3DFT), gradient-refocused acquisition in a steady state (GRASS) pulse sequence. Arthroscopic confirmation was available in all cases and was the standard for comparison. Thirteen of these extremities were also examined by using a two-dimensional Fourier transform spin-echo pulse sequence with a 2000-msec repetition time and 20- and 80-msec echo time. In these 13 cases, both pulse sequences correctly identified seven of eight meniscal abnormalities. However, interpretation of the 3DFT GRASS images resulted in fewer false-positive meniscal tears (three vs six). Cruciate ligament tears were detected more readily on the 3DFT GRASS images (six vs three with two possible tears on the spin-echo images). These preliminary findings suggest that the overall accuracy of MR imaging of the knee could be improved by including 3DFT gradient-refocused pulse sequences.

Publication types

  • Comparative Study

MeSH terms

  • Adolescent
  • Adult
  • Arthroscopy
  • Female
  • Humans
  • Joint Diseases / diagnosis
  • Knee Injuries / diagnosis
  • Knee Joint / anatomy & histology
  • Knee Joint / pathology*
  • Magnetic Resonance Imaging* / methods
  • Male
  • Middle Aged