Miller-Galante TKA (MG: 1986-1990 and MG II: 1991-1993) were performed on 119 knees affected by osteoarthritis or rheumatoid arthritis. Forty four MG and 32 MG II were available for follow up. Wear of patellar component was seen in 3 MG knees and revision surgery was performed for these three cases. Patellar dislocation occurred in 3 cases (4 MG knees) and proximal realignment was performed in 3 of these knees. There has been no patellar dislocation and wear on patellar component with MG II.
Three knees which required revision of the patellar component had a wide range of motion and high activity. They also had good congruity of the patellar and femoral components. The patellar component of MG II was strongly constrained in the groove of the femoral component by their design and shape. Therefore the eccentric high contact pressure of the patella is likely to be on the femoral component. The problem of wear of the patellar component has not been resolved but the metal backed patellar component should not be used.