Safe zone in the mid shaft
The anatomy in the area between the two solid lines on the enlarged view is represented by one cross section and does not vary significantly for different levels of cross section within this zone.
Anterolateral Approach (D)
Vastus lateralis and rectus femoris are palpated with the patient in supine position. The direction of the pin should be in the plane between these two muscles, as shown in the above diagram. Care should be taken to avoid perforation beyond the femoral cortex medially to prevent injury to the neurovascular structures.