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 .
Concave versus posterior-stabilized tibial joint surface in total knee arthroplasty: randomized evaluation of 47 knees.
Forty-seven knees in 43 patients with severe deformities r and omly received AMK total knee arthroplasty with concave ( C , n = 25 ) or posterior-stabilized ( PS , n = 22 ) polyethylene insert and with resection of the posterior cruciate ligament . Radiostereometric examinations were done postoperatively and after 3 , 12 , and 24 months . Two patients ( 1 C , 1 PS ) underwent revision surgery . At the 2-year follow-up , the median absolute rotations of the tibial inserts ranged from 0.13 degrees to 0.26 degrees ( C vs PS ; P = .1-.7 ) . The maximum total point motion was almost identical in the 2 groups ( C , 0.38 ; PS , 0.39 ; P = .9 ) . Maximum subsidence , lift-off , and Hospital for Special Surgery scores did not differ ( P = .1-.6 ) . Recipients of 20 of 24 knees with concave design and 14 of 19 knees with posterior-stabilized design reported that their knee could be regarded as normal or almost normal . Variations of the configuration of the polyethylene insert did not alter the outcome in the short term
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 .