This is a prospective, randomized study with two cohorts: one experimental and one control. Anteroposterior (AP) and lateral (LAT) radiographs are routinely obtained as standard of care during spine surgery to confirm proper implant placement. These images will be used in this study. In one-half of the study subjects, after all sponges are removed, a surgical sponge will be intentionally placed in the surgical field prior to imaging. Postoperatively, each subject's images will be assessed for the presence or absence of a retained surgical sponge. Images will be independently read by two investigators. When there is discordance, the images will be adjudicated by a third. Interobserver agreement will be quantified using the Kappa statistic. Those reading images will not have participated in the surgery.
