Abstract
In 18 patients with osteoarthritis of the knee, 28 ACG-S total knee prostheses were implanted without using cement. Clinical results and roentgenographic features were assessed with mean follow-up of 2.9 years. On the femoral side, no radiolucent lines were seen at the interface between bone and the implant. On the tibial side, radiolucent lines were noted in 9 knees (32.1%). These lines were seen only around the non-porous coated stem. In 6 knees, the radiolucent lines were less than 2mm thick and not progressive. In one knee a progressive radiolucent line of more than 2mm in thickness was noted. There was no statistically significant correlation between the occurrence of radiolucent lines and postoperative clinical results. The postoperative axial alignment and the placement of the prosthetic component had no significant influence on the occurrence of radiolucent lines. The occurrence of radiolucent lines was closely associated with preoperative contracture and malalignment of the knee. The porous-coated cementless total knee arthroplasty is a valuable procedure for the treatment of osteoarthritis, however, fixation with cement is recommended in severely deformed knees in which ligamentous balance cannot be maintained at the operation.
