Gravity-Assisted Navigation System for Total Hip Arthroplasty
In this chapter we propose a new system that allows reliable acetabular cup placement in total hip arthroplasty (THA) when the surgery is operated in lateral approach. Conceptually it combines the accuracy of computer-generated patient-specific morphology information with an easy-to-use mechanical guide, which effectively uses natural gravity as the angular reference. The former is achieved by using a statistical shape model-based 2D-3D reconstruction technique that can generate a scaled, patient-specific 3D shape model of the pelvis from a single conventional anteroposterior (AP) pelvic X-ray radiograph. The reconstructed 3D shape model facilitates a reliable and accurate co-registration of the mechanical guide with the patient’s anatomy in the operating theater. We validated the accuracy of our system by conducting experiments on placing seven cups to four pelvises with different morphologies. Taking the measurements from an image-free navigation system as the ground truth, our system showed an average accuracy of 2. 1 ± 0. 7∘ for inclination and an average accuracy of 1. 2 ± 1. 4∘ for anteversion.
KeywordsTotal hip arthroplasty (THA) Gravity-assisted navigation system (GANS) Statistical shape model 2D-3D reconstruction Smart instrumentation Mechanical guide
This chapter was modified from the paper published by our group in the 2011 International Conference on Information Processing in Computer Assisted Interventions (IPCAI 2011) (Zheng et al., IPCAI 2011:101–112). The related contents were reused with the permission.
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