Black Colouration of the Knee Articular Cartilage after Spontaneously Recurrent Haemarthrosis

Figure 2

Surgical findings. (a) Macroscopic findings during total knee replacement reveal that the femoral and tibial articular cartilage exhibit brown, grey, and black pigmentation and that the synovial membranes also exhibited reddish-brown discolouration. (b) After cutting the distal femur, we observed that only the joint surface cartilage, not the subchondral bone, exhibited the black colouration.

(a)

(b)