Table 2 Comparisons of lesion characteristics between false negative and true positive MRI for the meniscus and articular cartilage

Medial meniscus tear

n = 7

n = 122

 ^*Short peripheral tear of posterior horn

n = 7

n = 1

<  0.01

 Root tear

n = 0

n = 7

ns

 Flap/ vertical oblique/ complex tear

n = 0

n = 63

0.01

 Bucket handle tear

n = 0

n = 27

ns

 Radial tear

n = 0

n = 7

ns

 Horizontal split and other degenerative tears

n = 0

n = 17

ns

 Concomitant ACL tear

n = 5

n = 24

<  0.01

Lateral meniscus tear

n = 32

n = 47

 ^*Short peripheral tear of posterior horn

n = 3

n = 1

ns

 Posterior horn partial thickness stable tear

n = 18

n = 4

<  0.01

 Full thickness longitudinal or flap tear

n = 5

n = 30

<  0.01

 Bucket handle tear

n = 0

n = 3

ns

 Radial tear with or without horizontal split

n = 5

n = 9

ns

 Root tear (underwent repair)

n = 1

n = 0

ns

 Concomitant ACL tear

n = 20

n = 22

ns

Cartilage lesion (all areas)

n = 56

n = 53

 Grade [1 or 2] vs. Grade [3 or 4] on arthroscopy

n = 41 vs. 15

n = 21 vs. 32

<  0.01

Cartilage lesion Grade [3 or 4] on arthroscopy

n = 15

n = 32

 Femoral condyle lesions

n = 12

n = 26

ns

 Tibial condyle lesions

n = 2

n = 14

ns

 Patella lesions

n = 2

n = 9

ns

 Trochlea lesions

n = 4

n = 13

ns