This prospective study will determine the efficacy of intraoperative x-ray to identify retained surgical sponges. The recommended practice for finding a retained sponge is by radiography. The purpose is to find out how useful plain x-rays are in open posterior lumbar spine surgery, information which is presently unavailable. The specific aim is to compare the sensitivity (seeing a sponge when one is actually present) and specificity (not seeing a sponge when one is not present) of radiography of the surgical field for three conditions: viewing one lateral radiograph versus viewing one anteroposterior radiograph versus viewing two radiographs together, one lateral and one anteroposterior.
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Accuracy
Timeframe: Intraoperative
Interobserver Reproducibility
Timeframe: Intraoperative
Intraobserver Reproducibility
Timeframe: Intraoperative
Sensitivity
Timeframe: Intraoperative
Specificity
Timeframe: Intraoperative