Abstract
Introduction: Internal derangements of knee joint constitute a major source of morbidity in patients attending orthopaedic outpatients department of our hospital. It includes a group of disorders due to disruption of normal functioning of ligaments and menisci of knee joint leading to persistent or intermittent signs and symptoms such as pain, instability, or abnormal mobility of the knee. MRI would be a noninvasive, nonoperator dependent effective modality for early detection of these pathologies and has very high negative predictive value.
 Material and Methods: The study was carried out over a period of one year from April 2018 to April 2019. Fifty patients with clinically suspected internal derangement of knee were included in this prospective study. They were evaluated with detailed clinical history and clinical examinations and were subsequently subjected to imaging of knee using 1.5 T HDxt 8 Channel GE MRI machine.
 Results: ACL was the commonest ligament to be injured with partial tear being more common than complete tear. MCL was the commonest ligament to be torn in association with ACL. Indirect signs of ACL injury were evaluated and helped to corroborate the tears. Meniscal injury was common in medial meniscus and predominantly involved the posterior horn. In lateral meniscus anterior horn was involved more than posterior horn. In both the meniscus horizontal tear was the most common. Certain pattern of associations of injuries was found such as ACL tear with posterolateral corner injury. 
 Interpretation and Conclusion: MR is an excellent tool for evaluation of ligaments, menisci and osseous structures of knee joint. Various clinical tests and appropriate clinical history complements MR examination. Similarly MR imaging of knee complements therapeutic arthroscopies and would greatly reduce the need of diagnostic arthroscopies. Thus MR is a non-invasive, painless and morbidity-free modality for accurate preoperative assessment that is well accepted by patients.
Highlights
Introduction: Internal derangements of knee joint constitute a major source of morbidity in patients attending orthopaedic outpatients department of our hospital
It includes a group of disorders due to disruption of normal functioning of ligaments and menisci of knee joint leading to persistent or intermittent signs and symptoms such as pain, instability, or abnormal mobility of the knee
Meniscal injury was common in medial meniscus and predominantly involved the posterior horn
Summary
Internal derangements of knee joint constitute a major source of morbidity in patients attending orthopaedic outpatients department of our hospital. It includes a group of disorders due to disruption of normal functioning of ligaments and menisci of knee joint leading to persistent or intermittent signs and symptoms such as pain, instability, or abnormal mobility of the knee. Fifty patients with clinically suspected internal derangement of knee were included in this prospective study They were evaluated with detailed clinical history and clinical examinations and were subsequently subjected to imaging of knee using 1.5 T HDxt 8 Channel GE MRI machine. The MRI is sensitive for the diagnosis of medial meniscal tears and anterior cruciate ligament tears but has lower sensitivity for injuries to the lateral meniscus, medial collateral ligament, patellar retinaculum, and articular cartilage.[2,3,4,5]
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