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 .
Cemented versus hydroxyapatite fixation of the femoral component of the Freeman-Samuelson total knee replacement: a radiostereometric analysis.
We have carried out a radiostereometric study of 50 patients ( 54 knees ) with osteoarthritis of the knee who were r and omly allocated to receive a cemented or a hydroxyapatite-coated femoral component for total knee replacement . The patients were also stratified to receive one of three types of articulating surface ( st and ard , rotating platform , Freeman-Samuelson (FS)1000 ) all based on the Freeman-Samuelson design . The tibial components were cemented in all cases .  Radiostereometry  was performed post-operatively and at 3 , 12 and 24 months . The analysis was restricted to rotation of the femoral component over time . After two years , rotation of the femoral components in the transverse , longitudinal and sagittal planes did not differ between the cemented and the hydroxyapatite-coated implants ( p = 0.2 to 0.9 ) . In total knee replacements with a rotating platform , the femoral component tended to tilt more posteriorly than in the other two design s , regardless of the choice of fixation ( cemented or hydroxyapatite-coated , p = 0.04 ) . The st and ard version of the femoral component , whether cemented or hydroxyapatite-coated , rotated more into valgus than was observed with the rotating-platform and FS1000 design s ( p = 0.005 ) . The increased constraint provided by the FS1000 component did not appear to have any adverse effect on fixation of the femoral component
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 .