We have reviewed 100 Attenborough total knee replacements in eighty-two patients with a follow-up of one to four years and conclude that this prosthesis has a valuable place in the surgical management of patients suffering from rheumatoid arthritis and osteoarthritis with severe involvement of the knee. In 85 per cent of these knees a good result was obtained with relief from pain, and in 77 per cent a useful range of movement with a stable knee. Only two patients with loosening and three with deep infection were seen in this series.