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MRI of the Popliteomeniscal Fasciculi

Hiroki Sakai1, Takahisa Sasho1, Yu-ichi Wada1, Sakae Sano1, Jun-ichi Iwasaki1, Fuminori Morita2 and Hideshige Moriya1

1 Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8677 Japan.
2 Department of Radiology, Graduate School of Medicine, Chiba University, Chuo-ku, Chiba 260-8677, Japan.


Figure 1
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  		Fig. 1 —Slice angle with respect to reference line. Arrowhead indicates reference line, {alpha} indicates slice angle.

 

Figure 2
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  		Fig. 2 —Effects of MRI sequence for depicting popliteomeniscal fasciculi (PMF). Four sets of sequences were applied for depicting PMF. From left column to right: T1-weighted, T2-weighted, proton density-weighted, and proton fat-saturation images. Posterosuperior fasciculi are depicted in upper four images and anteroinferior fasciculi are depicted in lower four.

 

Figure 3
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  		Fig. 3A —Effects of MRI matrix size on popliteomeniscal fasciculi (PMF) depiction. Three sets of matrices applied for depicting PMF were 256 x 128 (A), 256 x 256 (B), and 512 x 256 (C).

 

Figure 4
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  		Fig. 3B —Effects of MRI matrix size on popliteomeniscal fasciculi (PMF) depiction. Three sets of matrices applied for depicting PMF were 256 x 128 (A), 256 x 256 (B), and 512 x 256 (C).

 

Figure 5
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  		Fig. 3C —Effects of MRI matrix size on popliteomeniscal fasciculi (PMF) depiction. Three sets of matrices applied for depicting PMF were 256 x 128 (A), 256 x 256 (B), and 512 x 256 (C).

 

Figure 6
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  		Fig. 4 —Effects of slice thickness on popliteomeniscal fasciculi (PMF) depiction. Four sets of slice thickness were used to depict PMF. Images from top row to bottom row show slice thicknesses of 2, 3, 4, and 5 mm, respectively.

 

Figure 7
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  		Fig. 5A —Effects of obliquity on popliteomeniscal fasciculi (PMF) depiction. Single representative image was selected from each of 11 sets of images from a single knee (10 sets of images were taken at every 10° from 0° to 90°, with respect to reference line, and an additional set of 45° oblique coronal images was taken) to show effects of oblique angle on appearance of PMF. Images show anteroinferior (arrows, A) and posterosuperior (arrowheads, B) fasciculi from various angles.

 

Figure 8
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  		Fig. 5B —Effects of obliquity on popliteomeniscal fasciculi (PMF) depiction. Single representative image was selected from each of 11 sets of images from a single knee (10 sets of images were taken at every 10° from 0° to 90°, with respect to reference line, and an additional set of 45° oblique coronal images was taken) to show effects of oblique angle on appearance of PMF. Images show anteroinferior (arrows, A) and posterosuperior (arrowheads, B) fasciculi from various angles.

 

Figure 9
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  		Fig. 6A —Classification for depiction of popliteomeniscal fasciculi (PMF). Optimal images show depiction of anteroinferior fasciculi (arrows) classified A, depicted with obvious continuity and with a low-intensity band (A); classified B, depicted with continuity but with ambiguous intensity structure (B); and classified C, depicted with discontinuity or not visible in any images (C).

 

Figure 10
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  		Fig. 6B —Classification for depiction of popliteomeniscal fasciculi (PMF). Optimal images show depiction of anteroinferior fasciculi (arrows) classified A, depicted with obvious continuity and with a low-intensity band (A); classified B, depicted with continuity but with ambiguous intensity structure (B); and classified C, depicted with discontinuity or not visible in any images (C).

 

Figure 11
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  		Fig. 6C —Classification for depiction of popliteomeniscal fasciculi (PMF). Optimal images show depiction of anteroinferior fasciculi (arrows) classified A, depicted with obvious continuity and with a low-intensity band (A); classified B, depicted with continuity but with ambiguous intensity structure (B); and classified C, depicted with discontinuity or not visible in any images (C).

 

Figure 12
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  		Fig. 6D —Classification for depiction of popliteomeniscal fasciculi (PMF). Optimal images show depiction of posterosuperior fasciculi (arrowheads) classified A, depicted with obvious continuity and with a low-intensity band (D); classified B, depicted with continuity but with ambiguous intensity structure (E); and classified C, depicted with discontinuity or not visible in any images (F).

 

Figure 13
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  		Fig. 6E —Classification for depiction of popliteomeniscal fasciculi (PMF). Optimal images show depiction of posterosuperior fasciculi (arrowheads) classified A, depicted with obvious continuity and with a low-intensity band (D); classified B, depicted with continuity but with ambiguous intensity structure (E); and classified C, depicted with discontinuity or not visible in any images (F).

 

Figure 14
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  		Fig. 6F —Classification for depiction of popliteomeniscal fasciculi (PMF). Optimal images show depiction of posterosuperior fasciculi (arrowheads) classified A, depicted with obvious continuity and with a low-intensity band (D); classified B, depicted with continuity but with ambiguous intensity structure (E); and classified C, depicted with discontinuity or not visible in any images (F).

 

Figure 15
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  		Fig. 7A —Graphs show scores for depicting fasciculi as a function of angle. Average score for depicting anteroinferior (A) and posterosuperior (B) fasciculi as a function of angle. Best angle for imaging both fasciculi was between 45° and 50°. Asterisks indicate statistical significance (p < 0.05).

 

Figure 16
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  		Fig. 7B —Graphs show scores for depicting fasciculi as a function of angle. Average score for depicting anteroinferior (A) and posterosuperior (B) fasciculi as a function of angle. Best angle for imaging both fasciculi was between 45° and 50°. Asterisks indicate statistical significance (p < 0.05).

 

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