Date	Event	Description
7 May 2010	New search has been performed	New searches have been conducted and two new studies added to the review (Dolibog 2008; Taradaj 2008). Two previously included trials have now been excluded as they were quasi‐randomised (Dyson 1976; Roche 1984).
7 May 2010	New citation required and conclusions have changed	Second update. The review has been substantially re‐written and re‐structured. We have re‐structured the review to distinguish high and low frequency ultrasound. We have also added a Summary of Findings table.
30 April 2008	Amended	Converted to new review format.
2 November 2007	New citation required and conclusions have changed	Substantive amendment. For this first update, new searches were carried out in August 2007 and one new trial met the inclusion criteria for the review (Franek 2004). Additional citations were identified for existing trials and these were added to the appropriate reference lists. One trial (Franek 2006a) is currently awaiting assessment, it has been translated but clarification has been sought from the author as to whether this trial is a further publication of Franek 2004.