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 .
A new uncemented hydroxyapatite-coated femoral component for the treatment of femoral neck fractures: two-year radiostereometric and bone densitometric evaluation in 50 hips.
Our aim in this pilot study was to evaluate the fixation of , the bone remodelling around , and the clinical outcome after surgery of a new , uncemented , fully hydroxyapatite-coated , collared and tapered femoral component , design ed specifically for elderly patients with a fracture of the femoral neck . We enrolled 50 patients , of at least 70 years of age , with an acute displaced fracture of the femoral neck in this prospect i ve single-series study . They received a total hip replacement using the new component and were followed up regularly for two years . Fixation was evaluated by radiostereometric analysis and bone remodelling by dual-energy x-ray absorptiometry .  Hip function and the health-related quality of life were assessed using the Harris hip score and the EuroQol-5D . Up to six weeks post-operatively there was a mean subsidence of 0.2 mm ( -2.1 to + 0.5 ) and a retroversion of a mean of 1.2 ° ( -8.2 ° to + 1.5 ° ) . No component migrated after three months . The patients had a continuous loss of peri-prosthetic bone which amounted to a mean of 16 % ( -49 % to + 10 % ) at two years . The mean Harris hip score was 82 ( 51 to 100 ) after two years . The two-year results from this pilot study indicate that this new , uncemented femoral component can be used for elderly patients with osteoporotic fractures of the femoral neck
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 .