A 3D-2D Image Registration Algorithm for Kinematic Analysis of the Knee after Total Knee Arthroplasty (TKA)

Total Knee Arthroplasty or TKA is a surgical procedure for relief of significant, disabling pain caused by severe arthritis. In TKA component design, 3D-2D registration using single plane fluoroscopy is very important for analyzing 3D knee kinematics. The purpose of this study is to determine the precision provided by a new 3D-2D registration algorithm for the kinematic analysis of TKA components. In this paper, we compare kinematic measurements obtained by our new 3D-2D registration algorithm with measurements provided by the gold standard Roentgen Stereo analysis (RSA). The main focus of the study is on the out-of-plane translation and rotation movements which are difficult to measure precisely using a single plane approach. From our experimental results we found that in the proposed algorithm the standard deviation of the error for out-of-plane translation is 0.38mm for the implant which compares favorably to RSA and is significantly lower than other previously proposed approaches can provide.