|
Objective: To study the knee anterior cruciate ligament ( ACL ) tear diagnostic value of MRI , Failures and improve the diagnostic accuracy of the method . Methods: prospective study of 44 cases of patients with knee injuries , arthroscopy as the gold standard , MRI findings and diagnostic accuracy analysis ACL tear . Line and important indirect signs of posterior cruciate ligament ( PCL ) , PCL angle and index measurement and statistical analysis . Results: Arthroscopic ACL tears confirmed in 23 patients , 21 normal , the ACL tear the patients partially torn in two cases , completely torn of 21 cases , MRI diagnosis of ACL tears a sensitivity of 95.7% , specificity of 85.7% an accuracy of 90.9% , a positive predictive value of 88.5 % , negative predictive value of 94.7% . 19 cases of 15 cases of ACL tears in patients with posterior cruciate ligament line positive, 20 cases of ACL patients with normal patients with posterior cruciate ligament line , the positive posterior cruciate ligament -ray diagnosis of ACL tears sensitivity of 78.9% and a specificity of 95.0% , accuracy 90.9% , positive predictive value of 93.8% , negative predictive value of 87.2% . The average PCL corner of ACL tear group ( 100 ± 5.9 ) ° the ACL the normal group ( 120 ± 8.9 ) ° , the difference between the two groups was statistically significant ( P < 0.05 ) . ACL tear group, the average PCL index 2.64 ± 0.27 , the ACL the normal group averaged 3.12 ± 0.31 , the difference between the two groups was statistically significant ( P > 0.05 ) . Conclusion : MR1 is the ideal screening method for the diagnosis of ACL tear . ACL chronic or partial tear , its diagnostic accuracy is reduced. Positive PCL line high specificity for the diagnosis of ACL tear index in the diagnosis of ACL tear PCL angle and PCL , the smaller its value , the greater the likelihood of ACL injury .
|