The effect of reformatting axis of computed tomography scans on the measurement of deformities in scaphoid waist nonunion.

Orthopaedics & Traumatology, Surgery & Research : OTSR
Gwan Bum LeeYoung Ho Shin

Abstract

Computed tomography (CT) has been used to understand the deformity of scaphoid nonunion, but no standard protocol for the reformatting of scaphoid CT imaging exists. The purpose of this study was to compare the reliability of measurements of the deformity of scaphoid waist nonunion between CT-scans reformatted in line with the scaphoid long axis and CT-scans reformatted in line with the wrist axis. We hypothesized that CT-scan which was reformatted along the scaphoid long axis is more reliable for understanding the deformity of scaphoid waist nonunion. CT-scans of 28 wrists with a scaphoid waist nonunion were reformatted along both the long axis of the scaphoid and of the wrist. For each set of CT-scans, the nonunion gap in axial, coronal and sagittal series, the intrascaphoid angle, and the height to length ratio were measured. All scans were reviewed twice by three observers and intraclass correlation coefficients (ICCs) for inter- and intraobserver reliability were assessed. For the measurement of nonunion gaps and height to length ratio, neither inter- nor intraobserver reliability showed significant differences between the two reformatting scans. However, for the intrascaphoid angle, both inter- (ICC: 0.202 vs. 0.419, p<0....Continue Reading

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