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 .
Two-year migration results of the ReCap hip resurfacing system—a radiostereometric follow-up study of 23 hips
There has been renewed interest for metal-on-metal hip resurfacing due to improved design and manufacturing of implants , better material s , and enhanced implant fixation . In contrast to conventional total hip replacements , only a few clinical hip resurfacing trials using radiostereometry ( RSA ) have been reported , and solely for the Birmingham hip resurfacing arthroplasty . The purpose of this RSA trial was to describe the migration pattern of a  new hip resurfacing system ( ReCap ) within the first two years after primary surgery . Twenty-six patients underwent total hip replacement .  The patients were followed-up for up to 24 months and were evaluated with the use of radiostereometric measurements .  The prosthesis showed mean translations and rotation close to zero . Maximum translation was seen along the transverse axis in the medial direction ( 0.13 mm ) . No statistically significant translation or rotation was seen at two-years follow-up , ( t-test , p < 0.05 , translation or rotation )
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 .