Validation of three-dimensional total knee replacement kinematics measurement using single-plane fluoroscopy

Abstract

Instability of the knee after total knee arthroplasty (TKA) is today the number one reason for aseptic revision surgery. In vivo evaluation of knee kinematics using single-plane fluoroscopy has become an important method to investigate knee stability and compare different implant designs.A validation experiment was performed to assess the accuracy of this method. A total knee implant was installed on sawbones and a flexion extension movement was performed with the sagittal plane parallel to the detector panel of the fluoroscope. Simultaneously, the sawbones were tracked using a conventional motion tracking system and rigidly attached markers. That measurement can be seen as a golden standard and is therefore believed to represent the real positions.The results indicate that knee rotations can be measured with an accuracy of approximately 0.6 • and sagittal plane translations can be measured with an accuracy of approximately 0.4 mm. These results prove that the method is sufficiently accurate for clinical use.

CenDerNet: Center and Curvature Representations for Render-and-Compare 6D Pose Estimation

“…Therefore, we focus on local geometry. Previous work has shown that geometric edges can be used for accurately estimating 6D poses [14,13,3]. We base our representation on view-space curvature.…”