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 .
The effect of early weight bearing on migration pattern of the uncemented CLS stem in total hip arthroplasty.
Forty-two patients ( younger than 65 years ) with osteoarthritis were operated on with an uncemented CLS stem and r and omized to early unrestricted weight bearing combined with intensive physiotherapy or to partial weight bearing combined with self-training . Radiostereometric analysis showed 1.2 ( + 0.11 to -6.76 ) mm subsidence of the stem at 24 months in both groups . There was no significant difference in the migration pattern between the unrestricted and partial weight bearing groups . Actual loading on the operated leg , measured with the F-scan system , did not influence the migration of the stem . There was a strong correlation between the average subsidence at 3 and 24 months ( r = 0.96 ) . Early full weight bearing and active rehabilitation can be used for the uncemented CLS stem without increased risk of early loosening
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 .