[Recent advances in imaging of hip and knee prostheses]. / L'imagerie actuelle des prothèses de hanche et de genou.

More than 222 000 hip and knee prostheses are implanted each year in France and this number is growing. Simple radiography is generally used to examine these prostheses in situ but this method has several limitations, including superimposition, the inability to visualize some parts of the prosthesis and to study them in the axial plane, and poor visualization of intra- and peri-articular soft tissues. This article describes the advantages offered by computed tomography and ultrasonography in this setting

[Foot imaging]. / Imagerie du pied.

Foot and ankle problems are frequent, daily pathologies. Nowadays, imaging is able to put in evidence the most part of these affections, in a simple, non traumatic way. A good clinical examination is of highest importance to guide the imaging technique. Well done simple X-rays in a standing position is the first mandatory step. Ultrasonography has revolutionized the study of the smooth parts of the foot: tendons, sprains, pathologies of plantar aponeurosis, hind-foot problems....It is therefore the first exam to ask for. Ultrasonography is enough to resolve a very important part of the superficial soft tissues pathologies. When this technique fails, whatever the reason, RMI is the best way to study soft tissues and bone marrow (stress fractures, small intraosseous lesions, osteonecrosis...). CTscan remains the best tool to study the hard part of the skeleton. Neither CTscan nor RMI can directly put in evidence the joint's cartilage with a high degree of precision. So, an arthrography remains mandatory to have a good study of the cartilage of the ankle.