INTERPRETATION The guidelines have improved method ological reporting in RSA studies , but adherence to these guidelines is still relatively low .
BACKGROUND AND PURPOSE Guidelines for st and ardization of  radiostereometry ( RSA )  of implants were published in 2005 to facilitate comparison of outcomes between various research groups .
In this systematic review , we determined how well studies have adhered to these guidelines .
Tibial component fixation in porous- and hydroxyapatite-coated total knee arthroplasty: a radiostereo metric evaluation of migration and inducible displacement after 5 years.
A total of 51 knees ( 45 patients ) with osteoarthrosis were stratified in a r and omized study to receive a hydroxyapatite-coated Freeman-Samuelson ( FS HA ) or a porous-coated Miller-Galante II ( MG II ) uncemented total knee arthroplasty . Repeated clinical , radiographic  , and  radiostereometric analysis (  RSA ) evaluations of the tibial components were done for 5 years . The clinical outcome was equal at the 5-year follow-up ( mean Hospital for Special Surgery score , 93 ) . St and ard radiographs displayed more zones around the tibial stem in the MG II group . RSA revealed that the FS HA components migrated less ( smaller maximum total point motion and maximum subsidence ) after 5 years and showed less inducible displacements at the 1-year follow-up . The stability of the implants obtained is equal to or better than cemented implants after 5 years . Key words : knee prosthesis , cementless , hydroxyapatite , radiostereometry , inducible displacement
INTERPRETATION The guidelines have improved method ological reporting in RSA studies , but adherence to these guidelines is still relatively low .
BACKGROUND AND PURPOSE Guidelines for st and ardization of  radiostereometry ( RSA )  of implants were published in 2005 to facilitate comparison of outcomes between various research groups .
In this systematic review , we determined how well studies have adhered to these guidelines .