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Observer variation in the detection of acetabular bone deficiencies |
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| Authors: | James F Wenz D L Hauser William W Scott Douglas D Robertson Michael J Tsapakos Dermot K Kearney David A Bluemke Daniel O Naiman Andrew F Brooker Edmund Y S Chao |
| Institution: | (1) Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA, TP;(2) Department of Radiology, Johns Hopkins University School of Medicine, Suite 4231 JHOC, 601 N. Caroline Street, Baltimore, MD 21287–0815, USA, TP;(3) Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland, USA, TP;(4) Department of Radiology, Washington University Medical School, St. Louis, Missouri, USA, US;(5) Department of Mathematical Sciences, Johns Hopkins University, Baltimore, Maryland, USA, TP;(6) Department of Orthopaedics, Texas Tech University, Lubbock, Texas,;(7) Department of Orthopaedic Biomechanics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA, TP |
| Abstract: | To determine observer variation in the detection of acetabular bone deficiencies, 42 pairs of frontal (AP) and lateral hip radiographs and CT studies for total hip arthroplasty patients obtained within an average of 4 weeks of each other were reviewed separately by five radiologists and one orthopedic surgeon. Interobserver variations were calculated for each individual reading the films using kappa values. The individual film readings were then compared with a consensus reading of the CT data. When separate observers were analyzed, agreement on plain film readings was slight to fair (av. kappa=0.1440±0.1047). The individual observers were not able to give readings which were very consistent with the CT consensus reading, resulting in a low sensitivity (65%) and specificity (74%) for acetabular defect classification with plain radiographs. The identification of acetabular bone defects from the AP and lateral views of the hip is highly subjective and variable from observer to observer. |
| Keywords: | Acetabular defects Observer variability Bone radiology Computed tomography |
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