It is well known that double contrast knee arthrogrphy is useful in diagnosis of meniscal lesions and other knee pathology, But intra-articular structures become less well delineated shortly after injection into the knee joint with water soluble contrast media because of rapid absorption and dilution of the injected media. This limits the time when sharpy detailed arthrograms are obtainable and precludes repeat delayed arthrogram without reinjection of contrast media. In order to overcome this major disadvantage, the authors used epinephrine which has vasoconstrictive effect and is expected to reduce fluid movement across the synovial membrane temoralrilly. The authors attempted to compare epinephrine inhanced double contrst arthrographic group , epinephrine(+) group, to the double contrast arthrographic group without epinephrine, epiniphrine(-) group, by statistical evaluation. Each group consisted of 35 cases and 7 lateral films of knee joint were taken sequentially 2, 6, 1 , 15, 20, 30, and 60 minutes after injection of contrast media, and were assessed by 5 certified radiologists, The results were as follows : 1. the difference of mean score of quality between epinephrine(+) group and epinephrine(-0 group was statistically significant at every time interval (p value <0.01 at minutes, p< 0.001 at all other time intervals). Epinephrine(+) group was superior to the epinephrine (-) group in quality of film. 2. Numbers of cases above score of 2 which was considered to be of diagnostic quality in evaluating mensical lesions were larger in epiniphrine(+) group than epinephrine(-) group at every time interval. And the difference between two groups was highly significant statistically (p <0.001). 3. Only 43% of cases was above score of 2 at 10 minutes inepinephrine(-) group , but 97% at 10 minutes and 80% at 20 minutes respectively in epinephrine(+) group, Therefore duration for adequate study of arthrogram is prolonged more than two times in epiniphrine(+) g oup.4. At 30 minutes . 57% of cases was above score of 2 in epiniphrine(+) group while at 15 minutes, 80% of cases was below score of 2 in epiniphrine(-) group. This makes it possible to repeat study without additional injection of contrast media or postponing of the examination in half of cases, if necessary. 5. The use of epinephrine in knee arthrography results in significant enhancement of radiographic quality initially (p<0.01). Therefore we can fluoroscope in good condition and obtain films of fine quality.