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Background: This study investigates radiation doses received by patients undergoing transforaminal (TFNB), hip, and sacroiliac joint (SIJ) nerve blocks by a single consultant orthopaedic surgeon across two separate settings: Theatre vs. Cath-lab. The fluoroscopic screening times (FST) patients were exposed to during their procedure were gathered to assess the relationship between FST and radiation dose received. Methods: Data was gathered retrospectively for a 30-month period from theatre and cath-lab records in a single hospital. Demographics gathered for each patient included gender, age, spinal level for TFNB procedures, radiation dose measured in Gray per centimetre squared (Gy/cm), and FST (seconds). Exclusion criteria included multiple or bilateral spinal levels. All TFNB, hip and SI joint data recorded were unilateral procedures. Independent sample t-tests were used to analyse the data. Results: A total of 442 patients met inclusion criteria. The mean radiation dose received during the TFNB for the theatre group (0.329 Gy/cm) was significantly higher than the cath-lab (0.260 Gy/cm) (P=0.002). This statistically significant observation of higher radiation doses in theatre versus the cath-lab was also seen for the hip (P=0.001) and SIJ (P=0.013) procedures, respectively. Pearson correlational analysis showed a moderately positive and statistically significant relationship between FST and radiation dose received by each patient (r=0.630, P=0.001). Conclusions: This retrospective cohort study demonstrated that patients undergoing TFNB, HIP and SIJ procedures are exposed to higher radiation doses in theatre than the Cath-lab. Longer FSTs were associated with higher radiation exposure. Location of procedure may represent a significant modifiable risk factor for ionising radiation exposure to both patients and clinicians.

mesentery and peritoneum

AB068. SOH21AS131. A retrospective analysis of radiation exposure to patients during orthopaedic fluoroscopic nerve block procedures: can we lessen the dose?