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 .
The introduction period of unicompartmental knee arthroplasty is critical: a clinical, clinical multicentered, and radiostereometric study of 251 Duracon unicompartmental knee arthroplasties.
One hundred twenty-eight consecutive knees were operated on with the Duracon unicompartmental knee arthroplasty . Of 111 knees , followed 3 years ( range , 1 - 6 years ) , 109 knees were satisfactory . Two knees were revised because of progression of osteoarthritis and inexplicable pain . Radiostereometric analysis in 49 knees showed a migration of 0.6 mm after 2 years . The magnitude of migration was lower in comparison with published series . In a multicenter study comprising 4 other hospitals , there were 8 revisions in 123 operated knees . The reasons were loosening , subsidence , or fracture . These revisions were within 1 year and mostly related to operative technique . Unicompartmental knee arthroplasty is a dem and ing procedure that needs special experience and includes a risk of early failures during the introduction of a system
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 .