Ultrasound is an imaging method that allows you to visualize bone contours and superficial soft tissues. The knee ultrasound allows the assessment of tendons, collateral ligaments, bursae and the vessels of the popliteal fossa. Ultrasound examination of the knee joint shows some limitations in the diagnosis of meniscus and cruciate ligament injuries. Knee magnetic resonance imaging is a test that enables a precise assessment of intra-articular structures.