2D/3D Registration of Acetabular Hip Implants Under Perspective Projection and Fully Differentiable Ellipse Fitting
This work addresses the need for precise implant pose estimation in clinical and surgical settings, but it is incremental as it builds on existing methods with specific improvements.
The paper tackled the problem of estimating the orientation and position of acetabular hip implants in total hip arthroplasty using fluoroscopy images, achieving high accuracy with minimal computational demands in simulated and digitally reconstructed radiograph environments.
This paper presents a novel method for estimating the orientation and the position of acetabular hip implants in total hip arthroplasty using full anterior-posterior hip fluoroscopy images. Our method accounts for distortions induced in the fluoroscope geometry, estimating acetabular component pose by creating a forward model of the perspective projection and implementing differentiable ellipse fitting for the similarity of our estimation from the ground truth. This approach enables precise estimation of the implant's rotation (anteversion, inclination) and the translation under the fluoroscope induced deformation. Experimental results from both numerically simulated and digitally reconstructed radiograph environments demonstrate high accuracy with minimal computational demands, offering enhanced precision and applicability in clinical and surgical settings.