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 .
Hydroxyapatite augmentation of the porous coating improves fixation of tibial components. A randomised RSA study in 116 patients.
In a single-blind , r and omised series of knee replacements in 116 patients , we used radiostereometric analysis ( RSA ) to measure micromotion in three types of tibial implant fixation for two years after knee replacement . We compared hydroxyapatite-augmented porous coating , porous coating , and cemented fixation of the same design of tibial component . At one to two years , porous-coated implants  migrated at a statistically significantly higher rate than hydroxyapatite-augmented or cemented implants . There was no significant difference between hydroxyapatite-coated and cemented implants . We conclude that hydroxyapatite augmentation may offer a clinical ly relevant advantage over a simple porous coating for tibial component fixation , but is no better than cemented fixation
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 .