Background: the menisci of the knee are complex structures with various important functions within the knee. Loss of the menisci leads to a significantly increased risk of developing degenerative changes in the long term. Purpose: this study aimed to investigate the role of Ultrasound (US) in diagnosis of meniscus tears as compared to Magnetic Resonance Imaging (MRI) Patients and Methods: this study included 50 patients, presented by pain, swelling, stiffness/limitation of movement or a history of acute/chronic knee trauma, in the duration between November 2017 and July 2018. The research was carried on the Radiology Department, Al Azhar General Hospital, Zagazig, Sharkia Governorate, Ministry of Health. All patients underwent musculoskeletal ultrasound in different position then underwent magnetic resonance imaging included different pulse sequences and scanning planes. Results: this study included 50 patients, 31 (62%) males and 19 (38%) females. The patient's age ranged between 10 and 67 years with a mean of 37.65 ± 10.24 SD. Male patient's age ranged between 10 and 67 years with a mean of 36.35 ± 11.03 SD, while female patient's age ranged between 29 and 55 years with a mean of 40 ± 8.34 SD. Conclusion: high resolution ultrasonography had high accuracy in detecting presence of tears in both the medial and lateral menisci. MRI is more sensitive in detection and determines types of tears than US.