In a prospective consecutive investigation radiologic tests for lateral and anterior instability in acute ankle distortion were found to be reliable indications of lateral ligament ruptures. Arthrography of the ankle joint was used as reference. Absence of instability, however, gives little information as to the ligamental status. The size of this group constitutes a clinical problem. Better results are achieved by combining lateral and anterior instability tests. If only one test is used, the anterior instability test should be preferred. The results of the two tests bare no relation to the degree of ligament ruptures found at operation.
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