Ankle arthrography, by direct puncture of joint cavity, is considered to be a simple and accurate diagnosticmethod for a precise evaluation of ligamentous injury. Forty-seven cases of ankle arthrography were successivelyperformed in the patients of acute ankle sprains. The purpose of this study is to demonstrate how anklearthrography can delineate the pathologic anatomy in such cases. The results are as follows; 1. Thirty cases amongforty seven revealed the findings of ligament tears. 2. For better diagnostic accuracy, the arthrography sholud beperformed within 72 hrs. after injury. 3. The anterior talofibular ligament tears were the most common(twenty-nine cases) of all and seventeen of them revealed tears without association of any other ligament terars.4. There were ten cases of calcaneofibular ligament tears and nine of them were associated with anteriortalofibular ligament tears. 5. Three cases of anterior tibiofibular and one deltoid ligament tears were demonstrated.