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 .
Comparison of micromotion in mobile bearing and posterior stabilized total knee prostheses
Background On theoretical grounds mobile bearing total knees should reduce the micromotion of the tibial component relative to the bone . Patients and methods We used radiostereometric analysis to measure the three-dimensional micromotion in  42 tibial components  during 2 years of follow-up . The patients had been r and omized as to whether they would receive a mobile bearing ( MB ) or posterior stabilized ( PS ) design .  We expected that the MB knee would facilitate dissipation of forces from the prosthesis-bone interface by the motion of the bearing and by load sharing with the soft tissues , leading to less micromotion . In the PS design s , limited free rotation caused by the campost articulation might cause additional stress at the bone-prosthesis interface . Results We found no significant differences between the MB and PS group at the 2-year follow-up evaluation with respect to Knee Society scores and radiographic results . The PS group had a higher variability in subsidence and anterior-posterior tilting of the component than the MB group . Interpretation The low variability of the data in the MB knee prosthesis group suggests that this design is more predictable and forgiving with respect to micromotion of the tibial component
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 .