Hyperlordotic positioning will be achieved through pelvic pads positioned low on iliac crest to maximize lumbar hyperlordosis and increased hip flexion with as many pillows as tolerated at thighs and knees to allow for increased sacral slope. Regular position will involve the pelvic pads at above or iliac crest and without extra pillows at thighs and legs.

Hyperlordotic positioning will be achieved through pelvic pads positioned low on iliac crest to maximize lumbar hyperlordosis and increased hip flexion with as many pillows as tolerated at thighs and knees to allow for increased sacral slope. Regular position will involve the pelvic pads at above or iliac crest and without extra pillows at thighs and legs.

X-rays will be performed at patients' pre-surgery visit, in the operating room prior to surgery and at the conclusion of surgery, and at 3 weeks after surgery at patients' postoperative visit. The specifics of the pelvic parameters will be measured at these visits. Also, the patient will complete VAS, ODI (Davidson, 2002; Fairbank, 2000 ), and WHOQOL-BREF prior to surgery and at 3 weeks follow-up. We will collect data on any complications occurring in the perioperative period till 3 weeks after surgery

Satisfaction ratings with regard to comfort in performing decompression and fusion will be collected by the coordinator prior to the end of the surgery to ensure that the surgeon remains blinded to allocation. It will be measured through a questionnaire using a series of verbal analog scales where 0 is completely unsatisfied and 10 is completely satisfied, the surgeon's degree of satisfaction with patient positioning and ease or difficulty in performing the surgery.