A cadaver model to evaluate the accuracy and reproducibility of plain radiograph step and gap measurements for intra-articular fracture of the distal radius.
作者信息
McCallister Wren V, Smith Jeffery M, Knight Jeff, Trumble Thomas E
机构信息
Department of Orthopaedics and Sports Medicine, University of Washington Medical Center, Seattle, WA 98195, USA.
出版信息
J Hand Surg Am. 2004 Sep;29(5):841-7. doi: 10.1016/j.jhsa.2004.04.019.
PURPOSE
The purpose of this study was to determine the accuracy and reproducibility of intra-articular step-off and gap displacements measured on plain radiographs using a standard cadaver model.
METHODS
Twenty-two physicians, in a blinded randomized fashion using a standard technique, examined the radiographs of 12 unique combinations of step and gap displacement created by a 3-part intra-articular osteotomy of the distal radius. Observer accuracy, inter- and intraobserver agreement, and tolerance limits were calculated.
RESULTS
The results of this study suggest that observers, independent of skill level, may measure step-off and gap displacements accurately to within .62 +/- .53 mm (95% confidence interval = .59-65). The accuracy of measurement was influenced by the quality of the radiograph. Intraclass correlation coefficient scores showed "substantial" (.78) to "almost perfect" (.81) inter- and intraobserver agreement.
CONCLUSIONS
These data can aid in the interpretation of clinical studies of acute distal radius fractures that are based on plain radiography.
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