A 72-year-old man was admitted complaining of long-standing pain in the right knee joint. The symptoms had started 5 years ago. Initially They were discontinuous with discomfort in the right knee joint which was brought about by activity and disappeared with rest. The pain had become worse in the last 3 years and limited the patient’s movements considerably. The movement of the joint was now very limited and he had difficulty in walking. He had no other disease and his past medical history was unremarkable.
on examination the right knee joint was painful when moved and the movement capacity was very limited. Other physical signs were unremarkable. Peripheral blood count, ESR and blood chemistry were within normal limits.
Radiographs of the right knee showed loss of joint space, osteophytes formation and subchondral sclerosis.
As the pain persisted despite medical treatment and the movement of the joint was severely limited, a right knee-joint replacement was performed.