PATELLA - Haemophilia

The central area of the articular surface shows irregular pitting with iron staining of the floor. The depth of the erosions suggests that they extend to expose bone. At the periphery there are irregular areas where the cartilage has been lost and around the articular surface there is haemosiderin impregnated synovium.
This young man had a Factor VIII of 2%. Over some 9 years he had had several episodes of bleeding into the left knee joint with pain and limitation of movement and ultimately, at the age of 21, the patella was removed.