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Year :2020
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Month :
October
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Volume :
9
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Issue :
4
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Page :
RO06 - RO11
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Intra-articular Traumatic Knee Joint Evaluation using 3T MRI: A Prospective Study
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Correspondence Address :
Vineela Rekha Vidavaluru, Swarnalatha Seelam, Praveena Goura, Vinay Kumar Ravilala,
Dr. Swarnalatha Seelam,
Assistant Professor, Department of Radiology, ESIC Medical College, Sanathnagar, Hyderabad-500038, Telangana, India.
E-mail: swarnal.seelam@esic.nic.in
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Introduction: Numerous studies have been performed in the past for assessing diagnostic efficacy of Magnetic Resonance Imaging (MRI) against arthroscopy in evaluating meniscal and cruciate ligament injuries of knee joint and adequate correlation was observed. However, many of these studies have been performed on scanners of 1.5 T (Tesla) or lower field strengths.
Aim: To assess the incidence and characterise the primary and secondary signs of intra-articular traumatic knee injuries and to assess the accuracy of 3T MRI by comparing the imaging findings with arthroscopy.
Materials and Methods: A cross-sectional prospective study was conducted between November 2017 to March 2020. During this period, a total of 287 patients with clinical suspicion of traumatic cruciate ligament/meniscal injuries who were referred for MRI at ESIC Super Speciality Hospital, Sanath Nagar, Hyderabad, Telangana, India, were included in the study. Among those who underwent the procedure, operative findings of 60 patients who revisited the hospital were obtained and compared to preoperative 3T MRI findings. Correlation between 3T MRI and arthroscopy findings was obtained by calculating sensitivity, specificity, Positive Predictive Value (PPV), Negative Predictive Value (NPV), accuracy, positive and negative likelihood ratios for Anterior Cruciate Ligament (ACL), Posterior Cruciate Ligament (PCL), Medial Meniscus (MM) and Lateral Meniscus (LM) tears individually.
Results: Sensitivity, Specificity, PPV, NPV and Accuracy were calculated for respective categories. For ACL tears it was 95.45%, 81.25%, 93.3%, 86.6%, 91.6%; For PCL tears it was 100%, 96.3%, 97%, 100%, 98.33%; For MM tears it was 97.1%, 88%, 91.8%, 95.6%, 93.3%; and for LM tears it was 95.65 %, 94.59%, 91.6%, 97.22%, 95%.
Conclusion: A 3T MRI improves the diagnostic accuracy of cruciate and meniscal injuries due to improved Signal-to-Noise Ratio (SNR), spatial resolution, better anatomical depiction of structures that are usually blind spots on arthroscopy (inferior surface and intrasubstance tears, posterolateral corner injuries, displaced small fragments into the recesses etc.).
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