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 .
Palamed G compared with Palacos R with gentamicin in Charnley total hip replacement. A randomised, radiostereometric study of 60 HIPS.
We performed a r and omised , radiostereometric study comparing two different bone cements , one of which has been sparsely clinical ly documented . R and omisation of 60 total hip replacements ( 57 patients ) into two groups of 30 was undertaken . All the patients were operated on using a cemented Charnley total hip replacement  , the only difference between groups being the bone cement used to secure the femoral component . The two cements used were Palamed G and Palacos R with gentamicin . The patients were followed up with repeated clinical and radiostereometric examinations for two years to assess the micromovement of the femoral component and the clinical outcome . The mean subsidence was 0.18 mm and 0.21 mm , and the mean internal rotation was 1.7 degrees and 2.0 degrees at two years for the Palamed G and Palacos R with gentamicin bone cements , respectively . We found no statistically significant differences between the groups . Micromovement occurred between the femoral component and the cement , while the cement mantle was stable inside the bone . The Harris hip score improved from a mean of 38 points ( 14 to 54 ) and 36 ( 10 to 57 ) pre-operatively to a mean of 92 ( 77 to 100 ) and 91 ( 63 to 100 ) at two years in the Palamed G and Palacos R groups , respectively . No differences were found between the groups . Both bone cements provided good initial fixation of the femoral component and good clinical results at two years
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 .