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

From: Accuracy measures of 1.5-tesla MRI for the diagnosis of ACL, meniscus and articular knee cartilage damage and characteristics of false negative lesions: a level III prognostic study

Lesion FN MRI group TP MRI group P value
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
  1. FN False Negative, TP True Positive, ns Non-significant; *, This lesion induced instability of the posterior horn and was repaired using 1 or 2 sutures. For the medial meniscus, this lesion is also termed “Ramp lesion” or “Small medial meniscocpasular lesion”