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 .
No difference in migration or wear between cemented low-profile cups and standard cups : A randomized radiostereographic study of 53 patients over 3 years
Background Minor design changes may cause major changes in implant performance . Thus , as part of a stepwise introduction of a new low-profile cup , we performed a r and omized trial comparing it to a well-docu-mented st and ard cup . Patients and methods 60 patients , stratified according to sex , weight , and age , underwent cemented total hip arthroplasty using a Lubinus SP2 stem with ceramic head  and were r and omized to either the new low-profile Lubinus Flanged Anti-Luxation cup ( FAL ) or the Lubinus St and ard Eccentric cup ( St and ard ) .  7 patients were excluded and 53 ( 28 FAL ) were evaluated at 3 , 6 , 12 , and 36 months postoperatively . Primary outcome variables , cup migration ( MTPM ) , and wear ( total 3-dimensional femoral head penetration ) were measured with radiostereometry ( RSA ) . Clinical outcome was evaluated with the western Ontario and McMaster osteoarthritis index ( Womac ) and the visual analog pain score ( VAS ) . Results We found no difference in migration between the FAL and St and ard cups . There was no difference in wear between the two cups and there was no correlation between wear and migration . 3 cups ( 2 FAL and 1 St and ard ) showed continuous migration of a magnitude that indicated an increased risk of early loosening . Clinical outcome was excellent , without any difference between the 2 groups
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 .