Hematoma is the American spelling of haematoma, which is an abnormal swelling of clotted blood within a muscle or tissue layer.


Causes of hematoma

A hematoma may occur after blunt trauma, especially if the person is on anticoagulants. It may also occur after injections or after surgery.


An overview of acute muscle and tendon injury around the knee.



Chronic expanding hematoma might be a potential insidious challenge for orthopedic surgeon. Pignatti G, Rani N and Carubbi C. Musculoskelet Surg. 2012 Aug;96(2):137-40. doi: 10.1007/s12306-011-0153-4. Epub 2011 Jun 24.

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