Pain in the knee joint has become one of the most common pathologies that are affecting humans of all age groups in the modern world. Many of the arthropathies are resolved with supportive care and complete tests but some of the diseases require early diagnosis and prompt treatment to prevent any long time effects. Doppler ultrasonography has revolutionized our way of approaching these diseases. It has several advantages over other imaging techniques. It is non-invasive and there is no use of a contrast dye which permits us to use this technique even in those patients who are hyper allergic. There is no use of radiations in ultrasonography. It can detect various minor abnormalities like cartilage thinning, partial or complete tears, synovial joints, abnormalities in the bony structure, inflammation debris in the joint, hematoma, and any ligamentous injury. It also helps us in the localization of the injury which further assist us in several aspects, one of which being the administration of the drugs with the help of an injection at the most optimal site.