Acetabular Labrum

Classification of the acetabular labra according to their shape on MR images and corresponding fast spin-echo MR images (2,000/16; echo train length, nine; matrix, 512 × 384; 4-mm-thick sections; field of view, 20 cm; three signals acquired). Acetabular labra were classified into four groups according to shape: triangular with a sharp edge of the labrum (arrow), round with a round edge (arrow), irregular (arrow) when they could not be classified into either of the first two categories, and absent when they could not be identified.
Classification of the acetabular labra according to their signal intensity on MR images and corresponding fast spin-echo MR images (2,000/16; echo train length, nine; matrix, 512 × 384; 4-mm-thick sections; field of view, 20 cm; three signals acquired). Acetabular labra were classified into five grades: grade 1 included those having a homogeneous low signal intensity, grade 2A included those having an intralabral area of moderate signal intensity (arrow), grade 2B included those having an intralabral area of high signal intensity (arrow), grade 3A included those having an area of high signal intensity that communicated with the free surface (arrow), and grade 3B included those that appeared as a whole area of diffuse high signal intensity.


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