The preoperative radiological assessment is based on different radiological examinations, exploring the tendons. In the United States, MRI is mainly used in this case. In France, it is CT-arthrography which is regarded as the standard of care because the high contrast resolution of the images obtained and their reliability appear to be higher than those of MRI. The articular puncture necessary to perform this examination is not regarded in our country as an obstacle. The MR-arthrography, which consists in injecting into the joint of very low concentration of gadolinium, makes it possible to obtain an arthrographic effect in MRI. This examination gives images with an excellent contrast. It is already very widespread in the USA. In France, we have an increasingly large experience of it, but still limited.