Date	Event	Description
27 January 2021	Amended	Correction to the format of the Risk of Bias figures.
19 February 2020	New citation required and conclusions have changed	In this update, the conclusions and the certainty of evidence have changed for one outcome. There is now high certainty evidence for a reduction in acute confusional state with the use of peripheral nerve blocks. Previously (2017 update), there was very low certainty evidence of no difference in this outcome.
16 November 2019	New search has been performed	The search was updated on 16 November 2019. Since the last version of this review (published in 2017), 18 new relevant randomized controlled trials including 1301 participants were published and have been included in this update. This review differs from the 2017 version by assessing the risk of bias of included trials with the risk of bias 2 tool. Two of the authors involved in the 2017 update withdrew from this update.
1 December 2018	Amended	We reran the search 1 December 2018
16 August 2016	New citation required and conclusions have changed	Two new authors joined the review We updated the search in June 2015 We updated the review and brought the methods up‐to‐date We found 55 new studies: 20 included, 13 excluded and 22 ongoing. We left no studies awaiting classification
16 August 2016	New search has been performed	We reran the search in August 2016
6 May 2015	New search has been performed	This review has been transferred to the Anaesthesia, Critical and Emergency Care Group by the Bone, Joint and Muscle Group
17 February 2009	New search has been performed	For the second substantive update (Issue 2, 2009), we made the following changes. 1. We included the following newly identified studies: Cuvillon 2007, Fletcher 2003, Foss 2005, Foss 2007, Gille 2006, Kullenberg 2004, Matot 2003, Murgue 2006 and Tuncer 2003. 2. We excluded the following studies: Gorodetskyi 2007, Mannion 2005, Marhofer 1998, Mutty 2007, Schiferer 2007, Turker 2003 and Piangatelli 2004. We made no changes to the conclusions of the review
6 November 2008	Amended	We converted the review to new review format
21 November 2001	New citation required and conclusions have changed	In this substantive update (Issue 1, 2002), we included one newly identified study (Scheinin 2000). We made no changes to the conclusions of the review For details on all updates, please see 'Notes'