Wrong-level spine surgery: A multicenter retrospective study.

BACKGROUND: Wrong-level spine surgery is a rare but serious complication of spinal surgery that increases patient harm and legal risks. Although such surgeries have been reported by many spine surgeons, they have not been adequately investigated. Therefore, this study aimed to examine the causes and preventive measures for wrong-level spine surgeries.

METHODS: This study analyzed cases of wrong-level spine surgeries from 10 medical centers. Factors such as age, sex, body mass index, preoperative diagnosis, surgical details, surgeon's experience, anatomical variations, responses, and causes of the wrong-level spine surgeries were studied. The methods used by the surgeons to confirm the surgical level were also surveyed using a questionnaire for each surgical procedure and site.

RESULTS: Eighteen cases (13 men and 5 women; mean age, 61.2 years; mean body mass index, 24.5 kg/m2 ) of wrong-level spine surgeries were evaluated in the study. Two cases involved emergency surgeries, three involved newly introduced procedures, and five showed anatomical variations. Wrong-level spine surgeries occurred more frequently in patients who underwent posterior thoracic surgery than in those who underwent other techniques (p < 0.01). Twenty-two spinal surgeons described the methods used to confirm the levels preoperatively and intraoperatively. In posterior thoracic laminectomies, half of the surgeons used preoperative markers to confirm the surgical level and did not perform intraoperative fluoroscopy. In posterior thoracic fusion, all surgeons confirmed the level using fluoroscopy preoperatively and intraoperatively.

CONCLUSIONS: Wrong-level spine surgeries occurred more frequently in posterior thoracic surgeries. The thoracic spine lacks the anatomical characteristics observed in the cervical and lumbar spine. The large drop in the spinous process can make it challenging for surgeons to determine the positional relationship between the spinous process and the vertebral body. Moreover, unfamiliarity with the technique and anatomical variations were also risk factors for wrong-level spine surgeries.