Low field MRI for the detection of acute knee injuries shows good diagnostic accuracy and interobserver agreement

In comparison to high field MR-scanners, the main disadvantages of low field MR-scanners are reduced signal-to-noise Ratio (SNR) and resolution in comparison with higher magnetic field strength. Despite these limitations, several publications which compared low field MRI to arthroscopy showed good sensitivity and specificity for the detection of cruciate ligament ruptures and meniscus lesions. Since there are no publications using low field MR-scanners of the newest generation so far, the objective of this study was to analyze the capabilities of low field MR-scanner of the newest generation in the detection of musculoskeletal knee injuries of acute trauma patients in comparison to the gold standard (arthroscopy and CT). In our study we observed very good sensitivity and specificity in the diagnosis of traumatic meniscal tears, ACL tears as well as fractures with low field MRI. Advantages of low field MRI are the reduced costs for purchasing and maintenance. It follows that high patient throughput based on economic pressure is not necessary, allowing to keep examination slots free for acute trauma patients.

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