The acceptable range of the changes of tibiofemoral and patellofemoral joint position in PCL retaining TKA for improved clinical results / 대한정형외과학회잡지

ABSTRACT

PURPOSE: to find out the change and limit of the changes of tibiofemoral joint line, patellar position and other related variables for improved postoperative knee function after PCL retaining TKRA. MATERIALS AND METHODS: The variables mentioned above were measured from the plain radiographs of 101 knees with PCL retaining TKRAs, correlated with clinical outcomes such as HSS score, range of motion and anterior knee pain. Then they were analyzed statistically. RESULTS: Tibiofemoral joint line, patellar height and femoral condylar size affected clinical outcomes. Excellent postoperative knee function resulted when the shift of tibiofemoral joint line position was between 5mm inferiorly to 5mm superiorly, postoperative patellar height between 15mm to 30mm, and the change of the femoral condylar size between 10mm decrease and 5mm increase. CONCLUSION: Excellent clinical results would be expected if the changes of the joint line position are kept within the range suggested in this paper.