title: Is There a Relationship Between Body Mass Index and Fluoroscopy Time During Sacroiliac Joint Injection? A Multicenter Cohort Study.
abstract: To determine the relationship between BMI and fluoroscopy time during intra-articular sacroiliac joint (SIJ) injections performed for a pain indication.
  
  
  
  Multicenter retrospective cohort study.
  
  
  
  Three academic, outpatient pain treatment centers.
  
  
  
  Patients who underwent fluoroscopy guided SIJ injection with encounter data regarding fluoroscopy time during the procedure and body mass index (BMI).
  
  
  
  Median and 25-75% Interquartile Range (IQR) fluoroscopy time.
  
  
  
  459 SIJ injections (350 patients) were included in this study. Patients had a median age of 57 (IQR 44, 70) years, and 72% were female. The median BMI in the normal weight, overweight, and obese groups were 23 (IQR 21, 24), 27 (IQR 26, 29), and 35 (IQR 32, 40), respectively. There was no significant difference in the median fluoroscopy time recorded between these BMI classes (p = 0.45). First-time SIJ injection (p = 0.53), bilateral injection (p = 0.30), trainee involvement (p = 0.47), and new trainee involvement (trainee participation during the first 2 months of the academic year) (p = 0.85) were not associated with increased fluoroscopy time for any of the three BMI categories.
  
  
  
  Fluoroscopy time during sacroiliac joint injection is not increased in patients who are overweight or obese, regardless of whether a first-time sacroiliac joint injection was performed, bilateral injections were performed, a trainee was involved, or a new trainee was involved.
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois zmccormi@gmail.com.
authors.forename: Zachary L
authors.initials: ZL
authors.lastname: McCormick
authors.affiliation: Division of PM&R, University of Utah, Salt Lake City, Utah.
authors.forename: Daniel
authors.initials: D
authors.lastname: Cushman
authors.affiliation: University of Illinois College of Medicine, Chicago, Illinois.
authors.forename: David T
authors.initials: DT
authors.lastname: Lee
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Paul
authors.initials: P
authors.lastname: Scholten
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Samuel K
authors.initials: SK
authors.lastname: Chu
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Ashwin N
authors.initials: AN
authors.lastname: Babu
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Mary
authors.initials: M
authors.lastname: Caldwell
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Craig
authors.initials: C
authors.lastname: Ziegler
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Humaira
authors.initials: H
authors.lastname: Ashraf
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Bindu
authors.initials: B
authors.lastname: Sundar
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Ryan
authors.initials: R
authors.lastname: Clark
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Claire
authors.initials: C
authors.lastname: Gross
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Cara
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Kristen
authors.initials: K
authors.lastname: McCormick
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Brendon
authors.initials: B
authors.lastname: Ross
authors.affiliation: Columbia University Medical Center, New York.
authors.forename: Clark C
authors.initials: CC
authors.lastname: Smith
authors.affiliation: *Department of Physical Medicine & Rehabilitation, Northwestern Feinberg School of Medicine/the Rehabilitation Institute of Chicago, Chicago, Illinois.
authors.forename: Joel
authors.initials: J
authors.lastname: Press
authors.affiliation: Department of Orthopaedics, Stanford University, Palo Alto, California.
authors.forename: Matthew
authors.initials: M
authors.lastname: Smuck
authors.affiliation: Department of Anesthesia, Northwestern Feinberg School of Medicine, Chicago, Illinois, USA.
authors.forename: David R
authors.initials: DR
authors.lastname: Walega
mesh_terms: D000328:Adult; D000368:Aged; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage; D015992:Body Mass Index; D015331:Cohort Studies; D005260:Female; D005471:Fluoroscopy; D005938:Glucocorticoids / Q000008:administration & dosage; D006801:Humans; D007270:Injections, Intra-Articular / Q000379:methods; D017116:Low Back Pain / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D015641:Radiography, Interventional / Q000379:methods*; D012189:Retrospective Studies; D012446:Sacroiliac Joint; D013997:Time Factors
chemical_list: D000893:Anti-Inflammatory Agents; D005938:Glucocorticoids
keywords: Body Mass Index; Fluoroscopy; Injections; Obesity; Overweight; Radiation; Sacroiliac Joint