ABSTRACT
To determine the outcome of cementless hydroxyapatite-coated total knee prosthesis in rheumatoid patients. Analytical. University of Yamanashi Hospital, Japan, from October 1999 to September 2002. Twenty total knee arthroplasties using HA-coated Scorpio Superflex CR and Delta 7000 series were performed in 17 rheumatoid patients. Pre and postoperative results were compared using JOA scores. Male: female ratio was 16:1, average age was 67 years and mean duration of follow-up was two years. JOA scores improved significantly [p<0.05] postoperatively from an average of 37 to 80. Varus and valgus angular deformities improved significantly and 90% of the knees had alignment between zero and 5 degrees of valgus angulation with an average tibiofemoral angle [FTA] of 172. The radiographic findings revealed no radiolucent lines at two years follow-up. Distal femur osteolysis was not observed. The clinical results were excellent at 2-year follow-up, which are in agreement with other reports using hydroxyapatite-coated knee prosthesis