Are CT Scans a Satisfactory Substitute for the Follow-Up of RSA Migration Studies of Uncemented Cups? A Comparison of RSA Double Examinations and CT Datasets of 46 Total Hip Arthroplasties

<div>The isosurface level for the CT volumes is set so that only metal is visible. The image of the 3D CT volume is rotated until it matches focuses 1 and 2 of the RSA radiographs. The tantalum beads in the periacetabular bone are numbered in the CT volume in the same sequence as in the RSA radiographs. Via rigid body transformation these bone marker coordinates from the RSA volume and CT volume are matched. Thereafter the tantalum beads of the liner in the CT volume are marked in the same way. Markers visible in only one of the RSA foci (red arrows) are excluded even in the CT volume.</div>

BioMed Research International

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Figure 1

Figure 1: Are CT Scans a Satisfactory Substitute for the Follow-Up of RSA Migration Studies of Uncemented Cups? A Comparison of RSA Double Examinations and CT Datasets of 46 Total Hip Arthroplasties 

Figure 1 | Are CT Scans a Satisfactory Substitute for the Follow-Up of RSA Migration Studies of Uncemented Cups? A Comparison of RSA Double Examinations and CT Datasets of 46 Total Hip Arthroplasties 