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ANATOMYRADIOLOGY The posterior concavity of the femoral shaft Two thin parallel lines of cortical bone density is buttressed along its middle third by the linea are occasionally seen running longitudinally aspera. This is a narrow, elevated length of bone along the middle third of the shaft of the femur with lateral and medial lips. It provides attach-on an A.P. radiograph. On the lateral view, inment for muscles of the Vastus and Adductor creased cortical thickness with filling in of the groups and the short head of Biceps Femoris usual posterior concavity of the femur is seen. (Last, 1978). It divides distally into medial and lateral supracondylar ridges. FIGURE 2A FIGURE 2. -Antero-posterior radiograph showing a pro-FIGURE I . -Antero-posterior radiograph of an minent linea aspera with filling in of the posterior concavity ?IatomiCal specimen showing two longitudinal parallel of the femur on the lateral projection. h e s in the mid shaft of the femur corresponding to the site of the medial and lateral lips of the linea aspera.

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