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 .
Addition of Fluoride to Acrylic Bone Cement Does Not Improve Fixation of a Total Hip Arthroplasty Stem
Improved fixation to bone is vital for improving the long term success of cemented implants . Addition of fluoride to acrylic bone cement may be one way to improve the quality of the bone cement interface and thereby reduce the risk of loosening .  Ninety patients ( 97 hips ) with a median age of 70 years ( range , 31 - 81 years ) scheduled for total hip arthroplasty were r and omized to receive a stem fixed with fluoride-containing acrylic bone cement or conventional acrylic bone cement . Fixation and bone remodeling around the femoral component was studied with radiostereometry and dual-energy xray absorptiometry up to 5 years after the operation in 73 patients ( 77 hips ) . Radiostereometric evaluation at 5 years revealed no differences in stem migration ( subsidence/lift-off ) or rotations . The stem subsidence inside the mantle was similar in the two groups . At 5 years the study group had lost more bone mineral in Gruen regions 5 and 7 than the controls . The Harris hip and pain score did not differ . Use of fluoride containing bone cement did not improve the stem fixation compared with a conventional cement used up to 5 years , but result ed in more pronounced loss of bone mineral density in the medial cortex . Level of Evidence : Therapeutic Level I. See Guidelines for Authors for a complete description of levels of evidence
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 .