Background: Distinguishing stable supination-external rotation (SER) 2 from unstable SER 4 ankle fractures, using standard radiographs, is controversial. Examination under anaesthesia (EUA), gravity-stress (GS) and weight-bearing (WB) radiographs can aid surgical decision-making. We evaluated the effect of three methods of fracture stability assessment.
Methods: Radiographs and case-notes of 312 consecutive patients with SER 2/4 fractures were reviewed. We recorded ankle stability assessment (plain film (PF) and EUA vs. GS vs. WB radiographs), management (conservative vs. operative), unplanned surgery and complications.
Results: Forty five percent assessed with GS underwent surgery (6% for PF/EUA, 4% for WB; P=0.0001). Amongst GS patients, 11% underwent additional surgery (0.1% PF/EUA, 0% WB; P=0.0001). Complications occurred in 2% of the WB group (8% for PF/EUA, 22% for GS; P=0.007).
Conclusion: This study associates GS assessment with higher rates of surgery and complications. Subsequent studies may determine the longer term effect stability assessments have on post-traumatic arthritis.
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