Date	Event	Description
26 January 2016	New search has been performed	We reran the search to March 2014
26 January 2016	New citation required and conclusions have changed	Compared to the previous version (Parker 2004) , we withdraw one study (Adams 1990; quasi‐randomized trial) and added five new studies (Biboulet 2012; Cao 2008; Heidari 2011; Hoppenstein 2005; Messina 2013). Compared to general anaesthesia, using a neuraxial block for the surgery decreases the rate of thrombosis only if a prophylaxis with low molecular weight heparin is not used. We did not find a difference for mortality, pneumonia, myocardial infarction, cerebrovascular accident, acute confusional state or chances of returning home after the surgery. Change in authors: Helen HG Handoll and Richard Griffiths left the review. Joanne Guay, Pushpaj R Gajendragadkar and Sandra Kopp joined the review for this update.
23 January 2014	Amended	This review has been transferred from the Bone, Joint and Muscle Trauma Group to the Cochrane Anaesthesia Group.
4 September 2008	Amended	Converted to new review format.
11 June 2004	New citation required and conclusions have changed	For the third update, first appearing in Issue 4, 2004, the trial search was updated to February 2004. The following changes were made. (1) Five studies comparing spinal versus general anaesthesia were newly included (Biffoli 1998; Casati 2003; Kamitani 2003; Svarting 1986; Wajima 1995). (2) Additional data were obtained for McLaren 1978 resulting in the number of patients being increased from 55 to 116 for some of the outcomes. (3) Seven studies were newly excluded and two added to 'Studies awaiting assessment'. (4) Format changes to conform to the revised Cochrane Style Guide. (5) There were substantive changes to the conclusions of the review, reflecting new findings on postoperative acute confusional state and in response to editorial comments.