title: Plain Radiographs are a Useful Substitute for Computed Tomography in Evaluating Acetabular Cup Version.
abstract: The purpose of this study is to compare acetabular component version measurements from cross-table lateral (XTL) radiographs, anteroposterior pelvis (AP-P) and anteroposterior hip (AP-H) radiographs, and axial pelvic computed tomography (CT) scans.
  
  
  
  One hundred fifty hips met our inclusion criteria of having a CT, XTL, and AP-P done postoperatively. Version was measured by 2 authors. Pearson regression analysis assessed correlation between versions of the modalities. Analysis of variance testing compared the averages of the values as a whole and based on demographics. When available, comparisons were also done with AP-H radiographs.
  
  
  
  Mean version for XTL and CT scan was 21.7° and 23.8°, respectively, whereas that from AP-P and AP-H radiographs was 12.5° and 17.2°, respectively. XTL and AP-H version measures were closely correlated with CT (P = .81), whereas AP-P measurements were only moderately correlated with CT (P = .75). AP-P and AP-H were significantly (P < .05) different from CT, whereas XTL was not (P = .36).
  
  
  
  The XTL radiograph remains a useful, cheaper, and safer substitute for CT scan when assessing supine version in the postoperative setting.
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Peter C
authors.initials: PC
authors.lastname: Noback
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Jonathan R
authors.initials: JR
authors.lastname: Danoff
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Thomas
authors.initials: T
authors.lastname: Herschmiller
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Jacob T
authors.initials: JT
authors.lastname: Bobman
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Roshan P
authors.initials: RP
authors.lastname: Shah
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Geller
authors.affiliation: Center for Hip and Knee Replacement, Department of Orthopedic Surgery, NewYork-Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: William
authors.initials: W
authors.lastname: Macaulay
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000601:surgery; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D003710:Demography; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011859:Radiography / Q000379:methods*; D014057:Tomography, X-Ray Computed
keywords: acetabular component version; anteroposterior hip; anteroposterior pelvis; computed tomography scan; cross-table lateral; total hip arthroplasty