3. Postoperative Imaging: in the postoperative patient, artefacts from metal may be present in or near the joint. With CT arthrography these artefacts are often less pronounced, compared with MR imaging. 4. Bone and calcifications: assessment of bony structures may be easier with CT arthrography compared with MR arthrography. Small osseous fragments, such as glenoid rim fractures may be difficult to see with MR arthrography. With CT these fragment or calcifications may be easily seen. 5. MR contraindications: CT arthrography is a valuable alternative in patients that have a contraindication for MR imaging. For example, the diagnosis of a meniscal tear is possible in the same way using CT arthrography as with MR imaging. In the shoulder, CT arthrography is well suited for the assessment of labral lesions, cartilage damage and rotator cuff tendons using the same diagnostic criteria as with MR arthrography. MR arthrography is an outpatient procedure, requires no anaesthesia and is essentially devoid of complications. It is relatively easy to perform, and is a definite aid in patients when conventional MR exams cannot provide for exact information which may be needed for sufficient therapy. MR arthrography, by virtue of its ability to demonstrate accurately intra-articular structures and abnormalities of these structures (e.g. labral lesions -shoulder, hip; partial articular-sided cuff tears), adds an important component to the radiologist`s armamentarium. Although not appropriate for all patients, MR arthrography plays an important role in the evaluation of patients with suspected intra-articular pathology who have equivocal clinical and conventional MR imaging findings. However, even nowadays, clinical use of MR arthrography is limited due to three main reasons: the conversion of a non-invasive procedure into an invasive, albeit minimally invasive, procedure; increased cost and time required to perform MR arthrography compared with conventional MR imaging; and the need to obtain patient`s consent for performing a MR arthrography exam since the use of intra-articular gadolinium compounds has not yet been approved generally. MR arthrography is an outpatient procedure, requires no anaesthesia and is essentially devoid of complications. It is relatively easy to perform, and is a definite aid in patients when conventional MR exams cannot provide for exact information which may be needed for sufficient therapy. MR arthrography, by virtue of its ability to demonstrate accurately intra-articular structures and abnormalities A-275 17:00