Radiographical measurements for distal intra-articular fractures of the radius using plain radiographs and cone beam computed tomography images.
OBJECTIVE
Operative treatment of an intra-articular distal radius fracture is one of the most common procedures in orthopedic and hand surgery. The intra- and interobserver agreement of common radiographical measurements of these fractures using cone beam computed tomography (CBCT) and plain radiographs were evaluated.


METHODS
Thirty-seven patients undergoing open reduction and volar fixation for a distal radius fracture were studied. Two radiologists analyzed the preoperative radiographs and CBCT images. Agreement of the measurements was subjected to intra-class correlation coefficient and the Bland-Altman analyses.


RESULTS
Plain radiographs provided a slightly poorer level of agreement. For fracture diastasis, excellent intraobserver agreement was achieved for radiographs and good or excellent agreement for CBCT, compared to poor interobserver agreement (ICC 0.334) for radiographs and good interobserver agreement (ICC 0.621) for CBCT images. The Bland-Altman analyses indicated a small mean difference between the measurements but rather large variation using both imaging methods, especially in angular measurements.


CONCLUSIONS
For most of the measurements, radiographs do well, and may be used in clinical practice. Two different measurements by the same reader or by two different readers can lead to different decisions, and therefore a standardization of the measurements is imperative. More detailed analysis of articular surface needs cross-sectional imaging modalities.
Department of Hand Surgery, Helsinki University Central Hospital, Topeliuksenkatu 5, Helsinki, P.0. Box 266, 00029 HUS, Finland. nora.suojarvi@helsinki.fi.
Nora
N
Suojärvi
Department of Radiology, HUS Helsinki Medical Imaging Center, Helsinki University Central Hospital, Topeliuksenkatu 5, Helsinki, P.O. Box 266, 00029 HUS, Finland.
T
T
Sillat
Department of Hand Surgery, Helsinki University Central Hospital, Topeliuksenkatu 5, Helsinki, P.0. Box 266, 00029 HUS, Finland.
N
N
Lindfors
Department of Radiology, HUS Helsinki Medical Imaging Center, Helsinki University Central Hospital, Topeliuksenkatu 5, Helsinki, P.O. Box 266, 00029 HUS, Finland.
S K
SK
Koskinen
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011856:Radiographic Image Enhancement / Q000379:methods*; D011885:Radius Fractures / Q000000981:diagnostic imaging*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014954:Wrist Injuries / Q000000981:diagnostic imaging*; D014962:X-Ray Film
Agreement; CBCT; Cone beam computed tomography; Distal radius fracture; Radiograph; Radiological measurement