Radiography and ultrasound: how far can you go? S. James; Birmingham/UK Hip arthroplasty is an extremely common orthopaedic procedure and there is a wide array of implants which are in current use. It is important to understand the normal radiographic appearances following hip joint replacement, so complications can be appreciated and accurately reported. Radiographs still provide the mainstay for the initial diagnosis of component failure, both in the immediate post-operative period and at long-term follow-up. The relative significance of different patterns of radiolucency, bone sclerosis and component position is discussed. The normal or pathological significance of these findings is correlated with design, surface and fixation of the prosthetic components. It is of vital importance that serial studies are compared to early post-operative x-rays during follow-up to report accurately any sign of prosthetic failure and trigger prompt specialist referral. Ultrasound is quick to perform, inexpensive, does not suffer from susceptibility artefacts and can be used to guide treatment. The common soft tissue complications following hip arthroplasty are reviewed and illustrated. Learning Objectives: 1. To become familiar with the radiographic appearances of different types of prosthesis design. 2. To recognise the normal radiographic appearances following hip joint replacement. 3 . To learn about the common abnormal radiographic findings following hip replacement. 4. To understand the role of ultrasound in assessing the post-operative hip. CT scan plays an increasing role in the evaluation of hip arthroplasty. This technique has wide indications, as it is more sensitive than radiographs in detecting osteolysis secondary to prosthesis loosening, it clearly shows the periprosthetic fluid collections suggesting infection, and is the best technique to guide their aspiration including the aorta and mesenteric, pelvic and cervical systems. In addition, in extremity trauma with suspicion for arterial injuries, CTA has proven accurate in helping diagnose significant vascular injuries. Yet digital subtraction angiography (DSA) is reserved for therapeutic intervention. This talk aims to discuss technical aspects as well as indications for CTA and DSA. In particular, the implementation of CTA in whole-body trauma CT is emphasised. In addition, typical imaging findings are reviewed. Learning Objectives: