Title:An Automatic Method Framework for Personalized Knee Prosthetic Modeling
Based on Kinematic Geometry
Volume: 20
Author(s): Pengxi Li, Hui Liu, Bocheng Zhang, Dongpei Liu, Liang Yang*Bin Liu*
Affiliation:
- The Second Hospital of Dalian Medical University, Dalian Medical University Lianoing, China
- International School of Information Science & Engineering (DUT-RUISE), Dalian University of Technology Dalian, China
- DUT-RU Co-Research Center of Advanced ICT for Active Life, Dalian University of Technology Lianoing, China
Keywords:
Knee motion simulation, Average knee modeling, Personalized prosthesis modeling, Total knee arthroplasty, Kinematic geometry, Automatic method framework.
Abstract: The shape of a knee prosthesis has an important impact on the effect of total knee arthroplasty. Comparing to a standard common prosthesis, the
personalized prosthesis has inherent advantages. However, how to construct a personalized knee prosthesis has not been studied deeply. In this
paper, we present an automatic method framework of modeling personalized knee prostheses based on shape statistics and kinematic geometry.
Firstly, the average healthy knee model is established through an unsupervised process. Secondly, the sTEA (Surgical Transecpicondylar Axis) is
calculated, and the average healthy knee model is resized according to it. Thirdly, the resized model is used to simulate the knee’s motion in a
healthy state. Fourthly, according to the target patient's condition, an excising operation is simulated on both patient's knee model and the resized
model to generate an initial knee prosthesis model. Finally, the initial prosthesis model is adjusted according to the simulated motion results. The
average maximum error between the resized healthy knee model and the patient's own knee model is less than 2 mm, and the average maximum
error between the motion simulation results and actual motion results is less than 3 mm. This framework can generate personalized knee prosthesis
models according to the patient’s different conditions, which makes up for the deficiencies of standard common prostheses.