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Table 2 Characteristic MRI findings in partial/complete MMPRTs

From: A characteristic MRI finding to diagnose a partial tear of the medial meniscus posterior root: an ocarina sign

 

Partial MMPRTs

Other MM tears

P value

Coronal images

 Cleft sign (%)

4 (17.4)

0 (0.0)

0.109a

 Giraffe neck sign (%)

5 (21.8)

0 (0.0)

0.049*a

 MM extrusion (mm)

3.21 ± 1.07

2.84 ± 1.21

0.142b

 MM extrusion > 3 mm (%)

13 (56.5)

12 (52.2)

1.000a

 Root irregularity (%)

11 (47.8)

2 (8.70)

0.007*a

 Bone marrow spot (%)

11 (47.8)

3 (13.0)

0.023*a

Sagittal images

 Ghost sign (%)

1 (4.3)

0 (0.0)

1.000a

 Ocarina sign (%)

16 (69.6)

3 (13.0)

< 0.001*a

 Bone marrow spot (%)

8 (34.8)

2 (8.70)

0.071a

Axial images

 Radial tear sign (%)

3 (13.0)

0 (0.0)

0.233a

  1. Data of medial meniscus (MM) extrusion are displayed as mean ± standard deviation. MRI magnetic resonance imaging, MMPRT medial meniscus posterior root tear. aFisher’s exact test. bMann–Whitney U test. *Significant difference