Hydroxyapatite-Coated total knee arthroplasty in rheumatoid artritis patients: a short-term follow-up study

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 161, 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