• P F W Hannemann, L Brouwers, D van der Zee, A Stadler, K W A Gottgens, R Weijers, M Poeze, and P R G Brink.
• Department of Surgery and Traumasurgery, Maastricht University Medical Centre, PO Box 5800, 6202 AZ Maastricht, The Netherlands. pfwhannemann@gmail.com
• Skeletal Radiol. 2013 Oct 1;42(10):1377-82.

ObjectiveTo examine reliability and validity concerning union of scaphoid fractures determined by multiplanar reconstruction computed tomography randomized at 6, 12, and 24 weeks after injury.Materials And MethodsWe used Fleiss' kappa to measure the opinions of three observers reviewing 44 sets of computed tomographic scans of 44 conservatively treated scaphoid waist fractures. We calculated kappa for the extent of consolidation (0-24 %, 25-49 %, 50-74 %, or 75-100 %) on the transverse, sagittal and coronal views. We also calculated kappa for no union, partial union, and union, and grouped the results for 6, 12, and 24 weeks after injury. As the reference standard for union, CT scans were performed at a minimum of 6 months after injury to determine validity.ResultsOverall inter-observer agreement was found to be moderate (κ = 0.576). No union (κ = 0.791), partial union (κ = 0.502), and union (κ = 0.683) showed substantial, moderate, and substantial agreement, respectively. The average sensitivity of multiplanar reconstruction CT for diagnosing union of scaphoid waist fractures was 73 %. The average specificity was 80 %.ConclusionsOur results suggest that multiplanar reconstruction computed tomography is a reliable and accurate method for diagnosing union or nonunion of scaphoid fractures. However, inter-observer agreement was lower with respect to partial union.

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