The author has performed double contrast arthrography of knee in 96 cases at Busan National UniversityHospital for about 4 years from May 1976 to April 1980. The 31 cases of them were analyzed both clinically andradiographycally with the background of definite diagnosis confirmed by operation. The results are as follows. 1.Of the 31 cases, 25 cases were male (80.6%), and 6 cases were female (19.4%). Male exceeded female in ratio of5:1. 2. 22 cases (70.1%) were distributed from 15 to 26 years of age. 3. The left knee joint was a more prevalentsite. The ratio of left to right was 16:14. One case was bilateral. 4. In 17 cases (45.2%) of the 31 cases, therewas a positive history of trauma. 14 cases had no specific history (54.8%). 5. The operative findings showedlateral meniscus lesion in 25 cases (80.6%) : medical meniscus lesion in 2 cases (6.5%); discoid meniscus in 2case (6.5%); lateral menisectomy in 1 cases (3.2%); and lateral meniscus lesion with medial collateral ligamenttearing in 1 case (3.2%). 6. In 25 cases of the 31 cases, the radiologic abnormal findings corresponded to theoperative findings. 5 cases revealed somewhat different features with the operative findings. One case whichshowed no abnormal roentgenographic findings was found to have abnormality at operation. As a result, thediagnostic accuracy of arthrography was 96.8%.