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 .
Less wear with aluminium-oxide heads than cobalt-chrome heads with ultra high molecular weight cemented polyethylene cups: A ten-year follow-up with radiostereometry
Purpose Wear is a major contributor to osteolysis and aseptic loosening of total hip replacements ( THR ) . Both alumina ( Al2O3 ) and cobalt-chrome ( CoCr ) femoral heads are commonly used . We investigated wear comparing alumina heads to cobalt-chrome heads against conventional cemented polyethylene ( PE ) cups for up to ten years . Methods Linear wear was measured with radiostereometry ( RSA ) . Our material was derived from two prospect i ve r and omised trials that investigated fixation of femoral stems , not wear , and was evaluated retrospectively ( Level III ) . Results The mean ( 95 % CI ) proximal head penetration was 0.96 mm ( 0.68–1.23 ) in the cobalt-chrome group and 0.42 mm ( 0.30–0.53 ) in the alumina group at ten years ( P = 0.001 ) . The mean ( 95 % CI ) 3D penetration was 1.07 mm ( 0.79–1.35 ) and 0.53 mm ( 0.38–0.63 ) , respectively , at ten years ( P = 0.001 ) . Conclusion Alumina heads performed better than cobalt-chrome heads in this study after ten-year follow-up
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 .