ANKLE PROSTHESES - MIDTERM RESULTS AFTER THOMPSON-RICHARDS AND STAR PROSTHESES

Thirty-seven patients with 20 cemented Thompson-Richards prostheses an d 19 cementless S.T.A.R. prostheses (2 bilateral cases) were followed up after 1-12 years. Rheumatoid arthritis was the main diagnosis in bo th populations, with females dominating. The investigation was based o n the Kofoed ankle score. At follow-up the total scoring improved to 8 6.9 pts. in S.T.A.R. and to 77.7 pts, in T.R.P. replacement. The radio logical examination showed a high rate of radiolucency for the tibial component (53.3%) in cemented T.R.P.; subsidence of talar component wa s seen in 3 cases with T.R.P. In cementless S.T.A.R. prosthesis only 3 cases showed small radiolucent lines of the flat tibial component. Ta lar subsidence was not seen at all. In T.R.P. we had two revisions due to prosthesis loosening and one malleolar fracture, giving a cumulati ve estimated survival rate of 87% at 12 years. In the S.T.A.R. prosthe sis group two revisions had to be performed because of one meniscal br eakage and correction of meniscal height. The estimated survival rate at 6 years was 94.3%.