Abstract: Arthrograms of the knee permit visualization of the soft tissue components of the knee joint. This is particularly important in the diagnosis of lesions of the menisci, especially tearing lesions. A device is disclosed which includes a novel clamp for supporting and restraining the patient's leg in a precise position in front of a unique film holder. A novel arthrographic protractor indicator is also provided to permit the technician to accurately identify the exact degree of knee rotation depicted in each radiograph. The device is uncomplicated, compact, and is constructed in a uniquely adjustable manner which permits accurate arthrographic studies of either the right or left knee in any size of individual. The arthrogram radiographs obtained with this device are clearer, more accurate and precisely reproducible, if necessary. All of these advantages are accompanied by greater comfort and far less radiation exposure to the patient, and to the radiological personnel.