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 .
Migration of the femoral stem after impaction bone grafting. First results of an ongoing, randomised study of the exeter and elite plus femoral stems using radiostereometric analysis.
We report the initial results of an ongoing r and omised , prospect i ve study on migration of the Exeter and Elite Plus femoral stems after impaction allografting  , as measured by radiostereometry . Clinical ly , the impaction technique gave good results for both stems . The mean subsidence in the first year was 1.30 mm and 0.20 mm for the Exeter and the Elite Plus stems , respectively . In the second year , the Exeter stem continued to subside further by a mean of 0.42 mm , while the Elite Plus stem did not do so . Subsidence of the Exeter stem correlated with deficiency of bone stock as grade d on the Gustilo and Pasternak scale . This correlation was not found for the Elite Plus stem . None of the other parameters which were studied predisposed to subsidence . There was no significant association between the amount of subsidence and the radiological appearance of the graft for either stem . Our findings do not support the theory that radial compression , due to subsidence of the Exeter stem , is the essential stimulus for remodelling in impaction allografting
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 .