Background The annual incidence of ankle fractures is 122 per 100,000 people. They usually affect young men and older women. The question of whether surgery or conservative treatment should be used for ankle fractures remains controversial. Objectives To assess the effects of surgical versus conservative interventions for treating ankle fractures in adults. Search methods We searched the Cochrane Bone, Joint and Muscle Trauma Group Specialised Register, the Cochrane Central Register of Controlled Trials (The Cochrane Library, 2012 Issue 1), MEDLINE, EMBASE, CINAHL and the WHO International Clinical Trials Registry Platform and Current Controlled Trials. Date of last search: 6 February 2012. Selection criteria Randomised and quasi-randomised controlled clinical studies comparing surgical and conservative treatments for ankle fractures in adults were included. Data collection and analysis Two review authors independently performed study selection, risk of bias assessment and data extraction. Authors of the included studies were contacted to obtain original data. Main results Three randomised controlled trials and one quasi-randomised controlled trial were included. These involved a total of 292 participants with ankle fractures. All studies were at high risk of bias from lack of blinding. Additionally, loss to follow-up or inappropriate exclusion of participants put two trials at high risk of attrition bias. The trials used different and incompatible outcome measures for assessing 1 Surgical versus conservative interventions for treating ankle fractures in adults (Review)