Improved Intra-operative Safety From Optimal Selection of Anti-slip Surface

To identify the best surface to minimize the risk of intra-operative slipping when placed in Trendelenburg position. The outcomes of interest are to minimize the amount of movement from predefined anatomic landmarks and maximize the ease of performing the intended surgery. The study consists of performing a randomized trial comparing 3 common anti-slip surfaces to determine which surface provides the best result in terms of safety and cost.