MRI findings Negative Positive 97.8% 45 28 100.0% 73 98.6% Total 100.0% 100.0% 46 28 74 100.0% 1 0 1 2.2% 0.0% 1.4% 5.9% 0.0% 1 0 1 1.4% Negative MRI ngings Positive MRI findings Negative Positive Total 17 57 74 16 57 73 94.1% 100.0% 100.0% 100.0% 98.6% 100.0% n %n %n n n %n 1 0 1 4.2% 0.0% 1.4% MRI findings Negative Positive Total 100.0% 24 50 74 23 95.8% 50 73 100.0% 100.0% 98.6% 100.0% C Negative Positive b=800 Total Sensitivity=%68 Specificity=%100 PPV=1 NPV=0.04 Fisher's test P=0.230 A 50 )45 (n40 ts35 ite30 n ap25 f ro20 eb15 um10 N 5 0 b=800 negative b=800 positive © Pol J Radiol, 2011; 76(1): 30-40 Aydin H et al – Is the quantitative diffusion-weighted MR Imaging… Table 3A–C. Results of ADC mapping for all meniscal tears, with b-values of 50, 400, and 800 sec/mm2. Negative MRI ngings Positive A Negative Positive b=50 Total Sensitivity=%38 Specificity=%100 PPV=1 NPV=0.02 Fisher's test P=1.000 b=50 negative b=50 positive B Negative Positive b=400 Total Sensitivity=%78 Specificity=%100 PPV=1 NPV=0.06 Fisher's test P=0.230 b=400 negative b=400 positive 45 )n40 ( ts35 ien30 a25 t fo20 p re15 m10 b u N 5 0 60 (n50 ) s ien40 t t a fp30 o re20 b um10 N 0 %n %n n n n %n %n n n %n n %n Negative Positive MRI ngings B Figure 2. Medial horizontal meniscal tear visualised with coronal ADC mapping with b-value of 400 (A) and 800 (B). MR imaging findings, we find no significant statistical differences in the evaluation of any of the meniscal tears (p>0.05): for medial meniscal tears, the sensitivity of 87%, with a lower specificity – of 27% (p value of 0.352). PPV and NPV for all matched sequences: 0.87/0.27. For lateral tears, 73% sensitivity with a very low specificity, of 13%, is observed (p: 0.352). PPV and NPV for all matched sequenc- es for the lateral menisci: 0.13/0.73 (Table 8). As shown above, matching of DWI plus ADC mapping correlated with MRI shows a very low specificity and a higher NPV, espe- cially in visualisation of lateral meniscal tears. Discussion The menisci serve several important biomechanical func- tions in the knee: absorb shock, distribute load during dynamic loading and assist in joint lubrication [2,3,9]. Both menisci are also mobile and allow movement in either ante- rio-posterior or lateral-medial direction. They provide sta- bility to the knee in weight-bearing or non-weight-bearing 35