Impact of a national enhanced recovery after surgery programme on patient outcomes of primary total knee replacement: an interrupted time series analysis from “The National Joint Registry of England, Wales, Northern Ireland and the Isle of Man”

ObjectiveWe aimed to test whether a national Enhanced Recovery After Surgery (ERAS) Programme in total knee replacement (TKR) had an impact on patient outcomes.DesignNatural-experiment (April 2008–December 2016). Interrupted time-series regression assessed impact on trends before-during-after ERAS implementation.SettingPrimary operations from the UK National Joint Registry (NJR) were linked with Hospital Episode Statistics (HES) data which...