There are numerous causes of avascular necrosis (AVN), which is at its most basic definition when blood flow to a bone is interrupted or reduced. Numerous mnemonics have been proposed to remember the many causes of AVN. My favorite is probably GIVE INFARCTS: GIVE INFARCTS · G- Gaucher disease · I- Idiopathic- Legg-Calve Perthes · … Continue reading
History: middle aged male with trauma. This is a subtrochanteric fracture of the femur. The above image is a 3D reconstruction from the raw data of a CT of the abdomen and pelvis, such that the patient did not have to undergo additional scanning and radiation exposure to get this image of the femur. See … Continue reading
History: 55 year old male with knee pain. This is a classic example of bone infarcts, here called osteonecrosis of the knee, which on radiographs is represented as a well defined sclerotic lesion with serpentine margins. In our example, the articular surfaces are mildly distorted, more so on the tibial plateau, causing collapse. On MRI, … Continue reading
The following images are from WikiRadiography (WetPaint) here. See a pediatric femur fracture here.