Improving Quality Based on the Joint Registry

\- Give monthly feedback from LROI-data (revision rate \& patient reported outcome measures) as well as other outcomes from the participating hospital (length-of-stay, readmission and complications), combined with education on how to use this information for improvement. This will be send monthly by email to the intervention group. Further, hospitals with worse performance for a certain outcome will be linked to hospitals with good performance for this outcome.