Gonadal Radiation Exposure and Risk Secondary to Fluoroscopic Imaging During Trauma Surgery

Study Overview
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Brief Summary
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The aim of this cohort study is to precisely measure patients' exposure to gonadal radiation during orthopaedic trauma surgery involving the acetabulum, pelvis, hip, and femur, and to apply these findings to a previously described and validated formula to determine the increased risk of future adverse health effects to the reproductive organs. The investigators null hypothesis is standard of care use of x-ray fluoroscopy during treatment of pelvis, hip, and femur fractures will not expose patients to a significant gonadal radiation load. Analysis of patients' intraoperative radiation doses by means of a previously validated formula will not display a significantly increased risk of adverse health events in the reproductive organs.

Detailed Description
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In the United States, physicians treat more than one and a half million fractures of the pelvis, hip, and femur each year.1-3 Exposure of patients to ionizing radiation during both diagnosis and treatment of these injuries is an unfortunate reality in the standard of care. Regulations put forth by the US National Radiation Committee (USNRC) include limiting maximum radiation exposure, above background levels, to individual members of the public to less than 1 millisievert (mSv) per year.4 While no current recommendations exist regarding medical exposure in patients, physicians are expected to display judicious practice of both diagnostic and therapeutic procedures during which patients are exposed to ionizing radiation.4 Nevertheless, patients whom undergo trauma activation are exposed to radiation levels that are significant and possibly excessive at 25 to 32 mSv during admission.5,6 The probability that radiation exposure may be reduced is supported by previous studies, which have established that only 60% of surgical trainees take into account the risks of radiation to a patient and that training on intraoperative fluoroscopy technique can decrease patient exposure by more than 50%, while maintaining an equivalent result.7,8 Few previous studies have addressed patient exposure to radiation during operative treatment of orthopaedic injuries.5,9,10 Previous research documenting radiation dose during surgeries of the pelvis and femur have used fluoroscope-calculated dose area product (DAP), which is less accurate than the direct dosimetry proposed in our study.11-13 Furthermore, prior studies have inappropriately determined stochastic risk through the linear no-threshold (LNT) model, which according to the USNRC, provides limited statistical power for epidemiologically based conclusions and overestimates risk at comparatively low doses such as those seen in trauma patients.14,15 Using a more accurate and previously validated model, the stochastic effects of exposure to the reproductive organs can be calculated at a more precise level than provided by previous studies.15,16 The investigators hope this research would allow the orthopaedic community to more accurately express the risks of intraoperative radiation to the patient, while supporting improved training on fluoroscopic technique and promoting the development of less fluoroscopic dependent fixation techniques.

Official Title
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A Descriptive Cohort Analysis of Gonadal Radiation Exposure and Risk Secondary to Fluoroscopic Imaging During Trauma Surgery About the Pelvis and Femur

Conditions
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Hip Fractures, Femur Fractures, Acetabular Fractures, Pelvic Injuries

Intervention / Treatment
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* Procedure: Exposure Recording


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients over the age of 18 Patients with: Hip fractures (femoral neck fractures, intertrochanteric fractures) Femur fractures (subtrochanteric fractures, femoral shaft fractures) Acetabular fractures Posterior pelvic ring injuries Patients requiring surgical fixation of their injuries per standard of care Exclusion Criteria: Any patients under the age of 18 Any patient not fluent in English. Hip fracture undergoing prosthetic replacement

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 88 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Standard of care, Exposure recording<br>Patient will undergo fracture surgery as per standard of care, and will have radiation exposure recording. | Procedure: Exposure Recording<br>* Patient undergoing fracture surgery will have radiation exposure recorded<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Gonadal radiation dose | The primary outcome variable will be patient gonadal radiation dose documented through dosimeter application and analysis during standard of care operative intervention. | During surgical intervention | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Fluoroscope-calculated dose. | The investigators will document fluoroscope-calculated dose. | During surgical intervention | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Gonadal Radiation Exposure, Fluoroscopic Imaging, Trauma Surgery, Pelvis fractures, Femur fractures