Common post retractor systems rely on a straight bar. Surgical tables are only 20-21 inches wide. The offset of the bed rail commonly used to attach devices adds another 2-3” of space.
When obese patients are larger than this footprint or when their arms are tucked, straight bars are placed directly against the patient’s body, risking injury.
These systems are usually placed one the sterile drape is on, making it very difficult to place padding between post and patient.