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 .
Acetabular reconstruction in developmental hip dysplasia using reinforcement ring with a hook
We followed prospect ively 27 patients with severe acetabular bone-stock deficiencies due to developmental dysplasia of the hip . Mean preoperative patient age was 56 ( 34–78 ) years , mean Harris hip score was 31 ( 16–66 ) points and pre-operative mean acetabular angle of Sharp was 47 ° ( 34 ° –61 ° ) . Operative acetabular reconstruction was performed in 28 hips using reinforcement ring with a hook placed in the true acetabulum and autologous bone grafting . A 2-year clinical and radiological follow-up was available in 27 hips . Mean Harris hip score improved to 91 ( 70–100 ) points . There were no clinical or radiological signs of aseptic loosening in 25 hips , and the bone graft was radiologically incorporated in all hips . In 24 hips , a radiostereometric analysis showed low rates of non-progressive translation and rotation in 21 reinforcement rings . Three rings showed progressive translation and /or rotation at the 2-year follow-up and were rated probably loose . RésuméNous avons suivi 27 malades avec des déficiences acétabulaires sévères dû à une dysplasie de développement de la hanche . L’âge moyen préopératoire des malades était de 56 ans ( 34–78 ) , le score moyen de Harris était de 31 points ( 16–66 ) et l’angle moyen de Sharp préopératoire était de 47 ° ( 34 ° –61 ° ) . La reconstruction acétabulaire a été exécutée dans 28 hanches en utilisent un anneau de renforcement avec crochet , placé dans le paléo-cotyle , avec greffe osseuse autologue . Un suivi clinique et radiologique de 2 années était disponible pour 27 hanches . Le score moyen de Harris a été amélioré à 91 points ( 70–100 ) . Il n’y avait pas de signe clinique ou radiologique de descellement aseptique dans 25 hanches et la greffe osseuse était incorporée dans toutes les hanches . Dans 24 hanches une analyse radiostéréométrique a montré un faible taux de translation et de rotation , non progressive , de 21 anneaux de renforcement . Trois anneaux ont montré une translation et/ou une rotation progressive au cours du suivi de 2 années et ont été considérés comme descellés
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 .