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Radiation Exposure Using Laser Guided Fluoroscopy in Various Orthopaedic Procedures

This study has been withdrawn prior to enrollment.
(Lack of personnel)
Information provided by (Responsible Party):
Montri D. Wongworawat, Loma Linda University Identifier:
First received: August 20, 2009
Last updated: September 29, 2013
Last verified: September 2013

August 20, 2009
September 29, 2013
August 2009
June 2011   (Final data collection date for primary outcome measure)
Duration of radiation exposure [ Time Frame: 1 to 12 weeks after surgery ]
Same as current
Complete list of historical versions of study NCT00972647 on Archive Site
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Radiation Exposure Using Laser Guided Fluoroscopy in Various Orthopaedic Procedures
Radiation Exposure Using Laser Guided Fluoroscopy in Various Orthopaedic Procedures

Introduction: The orthopaedic surgeon is frequently exposed to ionizing radiation, especially during intraoperative fluoroscopy. It is expected that using a laser guided fluoroscopy technique, which should improve accuracy of radiography, should also reduce the amount of time of exposure to radiation. Finally, the literature appears controversial in this matter with no clear conclusions that could be drawn from such.

Hypothesis: The test hypothesis is that the use of the laser-aiming device for fluoroscopy in several orthopaedic procedures will reduce the exposure of the patient and the surgeon to the damaging effects of radiation. The null hypothesis then states that there will be no difference in exposure to radiation between the group using the laser device and the group not using the apparatus.

Methods: A prospective randomized controlled trial will be performed in which patients undergoing fluoroscopy will be randomly allocated to two groups. One group will undergo imaging with use of the device throughout the procedure and the other group will undergo radiation without the laser guided device. Number and time of exposure will be recorded for each procedure. It is of the utmost importance that the complexity of the procedures remains relatively similar. It is believed that a good measure of complexity is the surgical time. Therefore, any procedures that are statistically similar from a set mean (p > 0.05) would be included into the study. It is also important that one or two surgeons with similar expertise and years of experience perform the surgeries to avoid confounding factors. It is expected that throughout the duration of the study (8 weeks) 50-100 cases would be reported which would produce statistically significant results. The results will be analyzed by calculating confidence intervals and differences between means of continuous data and significance levels by the Student's t test. Statistical significance will be set to P < 0.05.

Risks and Benefits: This study involves minimal risk. The use of the laser guide will not increase or introduce any risks other than the associated inherent surgical risks. The risks usually associated with this type of studies concern breach of confidentiality. To reduce this risk, research numbers will be assigned to subjects' data collected during the procedure, whose personal information will be found in another password-protected database.

This study will help the investigators to investigate a technique that may help reduce the amount of time that a patient is exposed to radiation.

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Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Outcomes Assessor)
Primary Purpose: Diagnostic
Procedure: Laser beam guidance
Using the laser centralizing beam to assist in position the body part prior to fluoroscopic imaging
  • No Intervention: Unguided
    Fluoroscopy images taken without laser beam guidance
  • Experimental: Laser guided
    Fluoroscopy images taken with laser beam guidance
    Intervention: Procedure: Laser beam guidance
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*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
June 2011
June 2011   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Patients with fractures requiring surgery with fluoroscopic assistance

Exclusion Criteria:

  • Patients with fractures treated without surgery
Sexes Eligible for Study: All
18 Years to 89 Years   (Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
United States
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Montri D. Wongworawat, Loma Linda University
Loma Linda University
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Principal Investigator: Montri D Wongworawat, MD Loma Linda University
Loma Linda University
September 2013

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP