This category contains 106 posts

Malleolar Fractures

History: Middle aged male with ankle pain.  Malleolar fractures are classified mainly by two classification systems, the Weber system and the Lauge-Hansen system. There are three main types of Weber fractures (A,B, and C). The Lauge-Hansen system is much more complex and divides the fractures into their mechanisms, including supination/adduction, supination/external rotation, pronation/abduction, and pronation/external … Continue reading

Hip Osteoarthritis

History: 65 year old male with bilateral hip pain.  This case illustrates the classic findings of hip osteoarthritis including joint space narrowing, subchondral cysts, and osteophytes or osseous productive changes. Osteoarthritis most commonly presents with morning stiffness and pain related to use, and is very common in patients older than 65 years of age. It … Continue reading

Thoracic Spine Compression Fractures – Vertebra Plana

History: elderly female with back pain and deformity.  This is a case of multiple thoracic spine pathologic compression fractures secondary to osteoporosis in an elderly female patient. Osteoporosis is a condition of decreased bone mineral density that places patients at risk for fracture. Causes of osteoporosis include prolonged steroid use, post-menopausal state, and normal aging, … Continue reading


History: middle aged male with knee pain.  This is a case of lipohemarthrosis beautifully demonstrated on MRI. Lipohemarthrosis is simply the presence of fat and blood in a joint effusion (see a large knee joint effusion here), and it typically is caused by a fracture at the articular surface of a joint that extends into … Continue reading

Subtrochanteric Femur Fracture

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

Pars Defects – Spondylolysis

History: young adult male with back pain.  This is a case of a pars interartcularis defect with anterolisthesis, also called spondylolysis with spondylolisthesis. These injuries are thought to be due to chronic repetitive stress at the pars interarticularis, and most commonly occur at the L5-S1 level. It is best demonstrated on oblique radiographs of the … Continue reading

Bone Infarcts

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

Pediatric Knee Anatomy

The following images are from WikiRadiography (WetPaint) here .

Pediatric Femur Anatomy

The following images are from WikiRadiography (WetPaint) here. See a pediatric femur fracture here.  

Lateral Epicondyle Avulsion Fracture

History: child with elbow pain.  This is an example of a lateral epicondyle avulsion fracture in a child, which is a very rare epicondyle fracture and much less common than medial epicondyle fractures. A lateral epicondyle fracture is due to an avulsion of the lateral epicondyle by excessive force from the common extensor tendon, which … Continue reading