Ultrasonography as a diagnostic tool for posteromedial corner pathologies: a pictorial essay

The posteromedial corner (PMC) is a common location for knee joint pain, and accurate diagnosis is essential for appropriate treatment. The frequent causes of pain in the PMC include pathologies of the posterior part of the medial meniscus, damage to articular cartilage, popliteal cysts and the semimembranosus tendinopathy. Currently, magnetic resonance imaging is the gold standard for assessing knee joint disorders, but its availability and cost can limit its use in some cases. In this pictorial essay, we presented the use of ultrasonography as an alternative method for assessing PMC. We present a series of images to demonstrate the value of ultrasonography and describe the methods used for assessing PMC with a particular focus on semimembranosus tendinopathy.