The efficacy of an epidural depends mainly on accurate placement of the catheter in the epidural space. Therefore, identification of the epidural space is the most vital part of the procedure. Obese patients represent the most challenging group for the identification of anatomical landmarks. With the use of ultrasound, we can visualize the images of the anatomical structures in the back. Some anesthesiologists believe ultrasound can help in the placement of an epidural, and routinely use it to assist in determining needle entry point in your back as well as estimating the depth at which the epidural space will be found. Our hypothesis is that the use of lumbar spine ultrasound imaging will accurately determine the epidural space depth and the epidural insertion point in obese patients.