INTERPRETATION There was a clinical ly relevant association between early migration of TKPs and late revision for loosening .
PURPOSE We performed two parallel systematic review s and meta-analyses to determine the association between early migration of tibial components and late aseptic revision .
Evaluation of micromotion in cemented vs uncemented knee arthroplasty in osteoarthrosis and rheumatoid arthritis. Randomized study using roentgen stereophotogrammetric analysis.
Twenty-four patients ( 25 knees ) with osteoarthrosis ( OA ) and 19 patients ( 20 knees ) with rheumatoid arthritis ( RA ) were operated with bi-tricompartmental knee arthroplasty .  The patients were r and omized to cemented or cementless fixation of the tibial component . The fixation of the tibial components was examined with roentgen stereophotogrammetric analysis ( RSA ) up to 24 months after operation . The following parameters representing tibial component micromotion were measured : ( 1 ) maximum migration of the prosthetic edge ( maximum total point motion , MTPM ) ; ( 2 ) distal migration of the prosthetic center ( subsidence ) ; ( 3 ) maximum proximal movements of the prosthetic edge ( " lift-off " ) ; and ( 4 ) prosthetic rotations , corresponding to internal/external rotation , adduction/abduction , and forward/backward tilt of the tibial component . All prostheses displayed significant micromotions , which tended to decrease 3 - 6 months after the operation . The average migration after 2 years , when measured as maximum single axis rotation , and MTPM were about 0.9 degrees-1.5 degrees and 1.0 - 1.5 mm , respectively , in all four groups . There were no statistically significant differences between cemented and cementless prostheses in either the OA or the RA group . The fixation in the RA patients did not significantly differ from that of the OA patients , perhaps because the RA patients had lower weight and were living a more sedentary life
INTERPRETATION There was a clinical ly relevant association between early migration of TKPs and late revision for loosening .
PURPOSE We performed two parallel systematic review s and meta-analyses to determine the association between early migration of tibial components and late aseptic revision .