Fig. 3.

A 69-year-old woman with Kashin-Beck disease (KBD) of the right knee received total knee arthroplasty (TKA). a, b The X-ray film before operation showed the knee joint was characterised by severe joint narrowing, marked osteophyte formation at the joint margin, as well as sclerosis of subchondral bone at the femoral condyle and tibial plateau. c, d Four years after surgery, there was no radiographic evidence of loosening or change in component positioning