- Supine position on a split table
Position the patient supine on a radiolucent table, slightly head down 10° to prevent sliding towards the foot of the table.
A small pad behind the knee allows the knee to rest in slight flexion. This also facilitates lateral x-ray images as this will lift the knee anterior to the contralateral side. If the pad is moved to lie behind the ankle, it helps maintain the knee in full extension.
A tourniquet around the thigh may be useful to control perioperative bleeding. Before inflating the tourniquet, the knee should be carefully ﬂexed beyond 90° and the patella manually pushed distally to gain as much length as necessary.
Also place a sandbag behind the same buttock to prevent external rotation of the leg.