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Estimation of radiographic joint space of the trapeziometacarpal joint with computed tomographic validation
David Jordan1, John Elfar1, Chian K Kwoh2
1University of Arizona College of Medicine, Hand Research Laboratory, Department of Orthopaedic Surgery, Tucson, Arizona, United States.
Purpose:
Joint space width (JSW) is a common metric used to evaluate joint structure on plain radiographs. For the hand, quantitative techniques are available for evaluation of the JSW of finger joints; however, such techniques have been difficult to establish for the trapeziometacarpal (TMC) joint. This study aimed to develop a validated method for measuring the radiographic joint space of the healthy TMC joint.
Approach:
Computed tomographic scans were taken of 15 cadaveric hands. The location of a JSW analysis region on the articular surface of the first metacarpal was established in 3D space and standardized in a 2D projection. The standardized region was applied to simulated radiographic images. A correction factor was defined as the ratio of the CT-based and radiograph-based joint space measurements. Leave-one-out validation was used to correct the radiograph-based measurements. A t-test was used to evaluate the difference between CT-based and corrected radiograph-based measurements ().
Results:
The CT-based and radiograph-based measurements of JSW were and , respectively. The correction factor for radiograph-based joint space was . Before correction, the difference between the CT-based and radiograph-based joint space was 1.43 mm [95% CI: ; ]. After correction, the difference was [95% CI: ; ].
Conclusions:
Corrected measurements of radiographic TMC JSW agreed well with CT-measured JSW. With in-vivo validation, the developed methodology has potential for automated and accurate radiographic measurement of TMC JSW.
