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What are the sonographic characteristics of complete tendon tears?
Hematoma or collection interrupting the course of the tendon - Lost muscle action by dynamic examination
A longitudinal view of the forearm shows the extensor digiti minimi tendon (interrupted by a hematoma) superficial to the extensor digitorum tendon. Dynamic examination was done by asking the patient to flex and extend the fingers. The extensor digiti minimi tendon shows lost contractile function, while the extensor digitorum tendon shows normal contractility. Note the sliding movement of the normal tendon contractile fibres.