RESUMEN
Objective To explore the diagnostic value of GRE T2 ? WI sequences in low field strength MR with oblique coronal plane in patients with acute anterior cruciate ligament (ACL)injury.Methods 68 cases of acute traumatic hemarthrosis of the knee joint proved surgically were reviewed.The cases were divided into two groups:conventional MR group (axial image,standard coro-nal image and sagittal oblique image),and conventional with oblique coronal MR group.The diagnostic results with surgical and path-ological results were compared.The diagnostic accuracy of two images were evaluated respectively.Results For conventional MR group and conventional with oblique coronal MR group,the sensitivities in diagnosing ACL were 72.9% and 97.9%,the specificities were 80% and 85%,the positive predictive values were 89.7% and 94%,the negative predictive values were 55.2% and 85%,the accuracies were 52.9% and 82.9%,the misdiagnosis rates were 20% and 1 5%,the missed diagnosis rates were 27.1% and 2.1%, and the coincidence rates was 75% and 94.1%,respectively.The difference in diagnosis rates between two groups were statistically significant(P <0.05).Conclusion GRE T2 ? WI sequences with oblique coronal plane can significantly improve the diagnostic rate of anterior cruciate ligament injury.