Study Design. Prospective in vivo radiation exposure study.
Objective. To assess surgeon exposure to ionizing radiation in the setting of lateral lumbar interbody fusion (LLIF).
Summary of Background Data. Minimally invasive spine surgery relies heavily on image guidance. Rapid popularization of minimally invasive spine surgery procedures, such as LLIF, is appropriately accompanied by concern regarding occupational radiation exposure related to intraoperative fluoroscopy.
Methods. Optically stimulated luminescence technology dosimeters were used to record radiation exposure prospectively at 5 anatomic locations during 18 LLIF procedures: (1) eye, (2) thyroid, (3) chest, (4) axilla, and (5) gluteal region. Additionally, a ring dosimeter was worn during 13 of the LLIF cases.
Results. Average fluoroscopy time was 88.7 ± 36.8 seconds and skin dose to the patient was 25.2 ± 21.1 mGy. The chest dosimeter protected by lead recorded the lowest readings per procedure (0.44 ± 0.49 mrem). The gluteal dosimeter recorded an average exposure of 2.31 ± 4.50 mrem and the dosimeter at the axilla recorded an average of 4.20 ± 7.76 mrem per procedure. Exposure to the thyroid and eye were 2.19 ± 2.07 mrem and 2.64 ± 2.76 mrem, respectively. With the exception of the gluteal region, dosimeter readings from all unprotected areas were significantly higher than those from the chest dosimeter (P < 0.0125). In the course of 13 procedures, 190 mrem of exposure to the hand was recorded by the ring dosimeters. More than 2700 LLIF procedures may be performed annually before occupational limits are exceeded.
Conclusion. Prolonged exposure to “low-level” radiation as an occupational risk remains a concern for medical personnel. Radiation exposures to unprotected, radiosensitive locations, such as the axilla or eye, are worrisome. However, following radiation safety guidelines, 2700 LLIF procedures can be performed per year before exceeding occupational dose limits. Adherence to radiation safety guidelines is necessary to avoid sequelae related to an invisible but potentially deadly risk of minimally invasive spine surgery procedures.
Surgeon radiation exposure during lateral lumbar interbody fusion (LLIF) was measured at 6 anatomic locations in this prospective in vivo radiation exposure study. Adhering to radiation safety guidelines, an average of 2700 LLIF procedures may be performed per year before exceeding occupational limits for planned exposure situations.
*Department of Orthopedic Surgery, Division of Spine Surgery
†Department of Radiology and Imaging, and
‡Department of Vascular Surgery, Presbyterian/Weill Cornell Hospital, New York, NY; and
§Department of Epidemiology and Biostatistics, Hospital for Special Surgery, New York, NY
Address correspondence and reprint requests to Fadi Taher, MD, Orthopedic Surgery, Division of Spine Surgery, Hospital for Special Surgery, 535 East 70th St, New York, NY 10021; E-mail: email@example.com
Acknowledgment date: October 16, 2012. First revision date: December 4, 2012. Acceptance date: January 4, 2013.
The device(s)/drug(s) is/are FDA-approved or approved by corresponding national agency for this indication.
No funds were received in support of this work.
Relevant financial activities outside the submitted work: consulting fee or honorarium, consultancy, royalties, stock/stock options, and payment for the development of educational programs.