Hemarthrosis is the American spelling of haemarthrosis.

Knee swollen with haemarthrosis

Swollen knee secondary to haemarthrosis.



The blood is contained within the knee capsule, giving the haemarthrosis a balloon-like quality.


Bleeding inside the knee joint

Haemarthrosis may be a result of trauma, such as a torn cruciate ligament, or it may be a complication of knee surgery, such as a lateral release, where the blood vessels have not been sealed prior to release of the tourniquet.


Enclosing the articulating part of the knee joint is a water-tight capsule made of a strong fibrous material lined on the inside with a thin layer of secretory cells.



Recurrent hemarthrosis after total knee arthroplasty. Rukavina A, Kerkhoffs GMMJ, Schneider P and Kuster MS. Knee Surg Sports Traumatol Arthrosc. 2010 Jul; 18(7): 898–900.

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