Tomographic technique for visualization of the cruciate ligaments in double contrast arthrography.

Double contrast arthrography of the knee is the method of choice for visualization of the menisci, while the single positive contrast technique is the preferred method for evaluation of the cruciate ligaments. A technique is described which combines the advantages of these two methods. Following radiography of the menisci, an essentially single positive contrast study of the cruciate ligaments is obtained by positioning the patient in the lateral recumbent position with the knee flexed to about 90degree. The positive contrast medium in this position fills the joint cavity beyond its mid-point and surrounds the cruciate ligaments. Tomographic studies of the midline of the knee joint, made in this position with a polytome unit, demonstrate the cruciate ligaments to best advantage.