A 30-day re-admission period was chosen to detect complications that could be assumed to have occurred as a consequence of the potential earlier PACU discharge The study will also investigate Length of stay, incidence of failed anesthesia, and reason for stay in PACU after THA and TKA 24.11.2016 A substudy based upon the un-published data from the time in PACU will be performed to analyse factors related to adverse events occuring during the PACU stay, and description of specific organdysfunction based upon the recordings from the modifed Aldrete discharge criteria.