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Femoro-acetabular impingement is an etiology of early osteoarthritis. It is a dynamic theory of development of arthritis due to bony deformations of the acetabulum or the proximal femur. The impingement is diagnosed clinically by the impingement and apprehension tests. The realisation of reproducible and technically irreproachable standard X-Rays is of first importance to detect the subtle but present signs of impingement. The MR arthrography is the best exam for detection of intra-articular pathologies with radial sequences allowing to establish a precise topography of the lesions. The treatment is most of the time surgical to avoid progression of cartilage lesions, either by an open surgical dislocation or arthroscopically for selected cases.

A radiologist should be included in the multidisciplinary approach which will allow optimal diagnostic evaluation and treatment of sarcoma. The appropriate use of ultrasound, computed tomography and magnetic resonance imaging plays a significant role in the evaluation of these tumors and their recurrences. The potential role of dynamic magnetic resonance imaging has also been evaluated. A review of diagnostic imaging and their clinical utility is discussed.

Pelvic trauma includes a great variety of very polymorphous lesions, differing from each other by their anatomical aspect, their context and therapeutic implication: In order to be efficient, the radiologist first has to know diagnostic value of each radiological technique, in order to suggest the investigation strategy appropriate to any clinical situation. Then, he must be able to accurately describe fractures and to include them into a classification in agreement with the clinician. Pelvic fractures form a polymorphous group. In the isolated acetabular fractures, function is mainly at stake. Radiological assessment relies upon good-quality plain films completed by CT imaging in fine slices with multiplanar reconstruction. Letournel's classification remains the reference standard. Management consists mainly of re-establishing a joint congruence to prevent early coxarthrosis. Pelvic fractures often occur in violent trauma and are associated with visceral lesions, putting vital prognosis at stake. Radiological assessment must be included in multidisciplinary management and CT imaging stands for the most complete and least time-consuming device, allowing for investigation of both visceral and osseous lesions. In case of hemodynamic shock, external fracture stabilization and embolization of pelvic bleeding are preponderant. Tile/Association for Osteosynthesis classification is the most used presently. It allows good description of mechanisms and lesions and more adapted management. [ABSTRACT FROM AUTHOR]

The goal of this study was to describe the MRI characteristics of posttraumatic pseudolipomas. Ten patients with previous history of blunt trauma or local surgery were investigated with MRI at the level of their deformity. The etiology was blunt trauma in eight patients and postoperative trauma in two. For all patients medical documentation, in the form of clinical history and physical examination, confirmed that a visible hematoma was present acutely at the same location following the injury and that the contour deformity subsequently appeared. All patients underwent liposuction. Preoperative bilateral MRI examinations were performed on all patients. The mean clinical follow-up was 17.8 months. MRI examinations were interpreted in consensus by two experienced musculoskeletal radiologists with attention to fatty extension (subcutaneous fatty thickness and anatomical extension), asymmetry compared with the asymptomatic side, the presence or absence of fibrous septae or nonfatty components, and patterns of contrast enhancement. Ten posttraumatic pseudolipomas were identified. Clinically, they showed as subcutaneous masses with the consistency of normal adipose tissue. Their locations were the abdomen (n=1), hip (n=1), the upper thigh (n=6), the knee (n=1), and the ankle (n=1). On MRI examinations, using the contralateral side as a control, pseudolipomas appeared as focal fatty masses without a capsule or contrast enhancement. Posttraumatic pseudolipomas may develop at a site of blunt trauma or surgical procedures often antedated by a soft tissue hematoma. Characteristic MRI findings are unencapsulated subcutaneous fatty masses without contrast enhancement. [ABSTRACT FROM AUTHOR]