"Superior continuation "
"Development "
"type 1 (parallel): equal distance between the medial and lateral lips throughout"
"type 2 (concave): widest distance between the medial and lateral lips at the proximal and distal ends, narrowest distance in the middle"
"type 3 (convex): widest distance between the medial and lateral lips in the middle, narrowest distance at the proximal and distal ends"
"type 4 (variform): distance between the medial and lateral lips variable throughout (most common type)"
"It's important to double-check the shoot through hip radiograph to ensure it has been orientated correctly (ischial tuberosity at the bottom), if the projection is sent upside down, the prominence of the linea aspera will be anterior and hence appear as an aggressive anterior periosteal reaction."
Expected headings
"Superior continuation "
"Inferior continuation"
"Development "
"There are four major anatomical variants based on the distance between the medial and lateral lips throughout the length of the linea aspera 1:"
"On lateral projections, prominence of the linea aspera may cause scalloping of the posterior femoral margin; this can mimic the radiographic appearance of osteonecrosis and periosteal reaction 3, 4."