Synovium is an essential component of the joint and plays a critical r
ole in maintaining a balance between physiological processes and patho
logical changes in the joint. Recurrent intra-articular bleeding as oc
cur in haemophilia induce pathological synovial changes in the joint.
From a certain point on, synovitis inevitably plays a major role in jo
int destruction, although in the early phase of haemophilic arthropath
y its role may be secondary to cartilage damage as a result of the dir
ect effects of blood on cartilage. The changed haemosiderotic, synovia
l tissue produces catabolic cytokines and enzymes harmful for cartilag
e.