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 the uncemented Cone and the cemented Bimetric hip prosthesis in young patients with osteoarthritis: An RSA, clinical and radiographic study
Background There is no consensus as to whether uncemented or cemented femoral stems should be used in younger patients . We compared the uncemented Cone stem to the cemented Bimetric stem in young patients with osteoarthritis . Patients and methods We r and omized 45 relatively young patients ( < 65 years old , mean age 54 years ) with osteoarthritis to either an uncemented Cone stem or a cemented Bimetric stem . All patients were followed for 2 years . Outcome was assessed by the Merle d’Aubigné score , conventional radiography and repeated radio-stereometric analysis ( RSA ) . We also followed 81 Cone stems for 8 ( 7–12 ) years with revision as endpoint . Results The clinical outcome was excellent . No patient had postoperative thigh pain . The migration was small . The Bimetric stem was stable during the whole observation period , while the Cone stem  subsided and rotated to retroversion during the first 3 months post-operatively , and then remained stable . In the follow-up study of 81 Cone stems , 1 stem was revised . Interpretation We conclude that both the cemented Bimetric stem and the uncemented Cone stem are stable and give excellent clinical results after 2 years in relatively young patients with osteoarthritis . Although design ed for CDH hips , the Cone stem appears to be suitable also for patients with osteoarthitis .
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 .