After the patient is properly positioned but before traction is applied, a systematic fluoroscopic examination should be performed first with the leg in extension in neutral, internal, and external rotation and next with the leg in 45º of flexion. Intraoperatively, the same views can be obtained and compared with the preoperative equivalents so that bony resection can be better judged. The hip area is then prepared and draped in the standard fashion. After traction is applied, an anterolateral portal is first identified, just over the anterosuperior margin of the greater trochanter. Portal placement must be done carefully, with care taken not to injure nearby neurovascular structures (see Overview, Technical Considerations). Careful positioning and padding can help avoid traction-induced or compressive injuries to the obturator, pudendal, and peroneal nerves or branches thereof. Marking the border of the greater trochanter and the anterior superior iliac spine (ASIS) can help identify anatomic landmarks. Drawing a line from the ASIS longitudinally down the leg should help ensure that no portal is placed medial to the line, thus minimizing major risk to the femoral nerve. (See the image below.) ! Uwagi : Oprawa nieznacznie wytarta. Brzegi stron zakurzone.