equipment available which differ both as to conception and field intensity and the various sequences must respond to precise technical indications. Basically, the structures that are to be evidenced are represented by fibrous-connective tissue, cartilage, synovial tissue and bone, and the modifications that may be caused on these by the varying pathologies must be taken into consideration. Sensitivity, specificity and multiplanarity are all fundamental elements to be considered when evaluating a magnetic resonance of the articulation. The morphology of the structure is best defined with the use of spin-echo sequences, in particular that of T1 weighted images. The sequences that exploit the suppression of fat, or fat--water separation, do seem to be the most suitable for a panoramic and comprehensive evaluation of the joint under study, as the various components may be observed in such a way so as to make a primary diagnostic codification on the underlying problem. Depending on the individual requirements, specific sequences may be added, such as those that give more detailed information/evaluation of cartilage damage, or a better view of flogistic synovial processes. With modern multidetector CT scanners CT arthrography with multiplanar reconstruction in high resolution is possible. CT arthrography is performed with intra articular injection of non diluted iodinated contrast material. CT arthrography of virtually any joint from head to toe is possible. There are several indications and advantages for CT arthrography: 1. Imaging time: imaging time with CT arthrography is much faster than MR. This is especially advantageous for anxious patients. Also for patients with claustrophobia, CT is often a better option. 2. Cartilage: CT arthrography has the advantage of high contrast between cartilage and contrast material. Therefore, CT arthrography may be superior in defining cartilage defects.