Abstract
MR imagings (0.5 Tesula 5mm slice, TR/TE : 510-6 2 0 msec/ 27-30) of the injured menisci in 38 knees of 38 patients (28 men and 10 women, with an average age of 25.9) were compared with their arthroscopic findings and classified into two types, the one with linear high-density area and the non-linear one.
Menisci with longitudinal tears in 10 knees of 17 and with horizontal tears in 4 of 8 showed a linear high-density area in MRI, but the others including menisci with transverse tears (in 8 knees) or bucket-handle tears (in 7 knees) showed a non-linear high density area. These results may be due to both the angle between the tear and the slice lines of MR imaging, and the degeneration of menisci.
The MRI of normal menisci in 10 knees were also investigated. A false-positive. high-density area was often seen at the synovia-meniscal junction in the coronal plane of MR imaging and was seen at the posterior or anterior menisci in the saggital plane.
