Kinematic Modeling of Ankle and Foot Bone Motion for Applications in Orthopedics and Gait Analysis (Kinematische modellering van enkel- en voetbeenbeweging voor toepassingen in de orthopedie en ganganalyse)
Kinematic Modeling of Ankle and Foot Bone Motion for Applications in Orthopedics and Gait Analysis
<span style="font-size:10.0pt;line-height:150%;font-family:LMRoman10-Regular;mso-bidi-font-family:LMRoman10-Regular">This PhD dissertation focuses on the development and validation of kinematic models of the ankle and foot for use during marker based gait analysis and applications in orthopedics. More specifically, it investigates the hypothesis that CT-based models can predict complete 3D joint kinematics at the ankle and joints of the foot from a limited set of degrees of freedom and as such be used as tools in clinical practice and research. Therefore, we first developed different numerical models to simulate ankle kinematics and methods to build these models from CT data. The models were compared and validated next using in vitro measurements of passive ankle kinematics and data of in vitro gait simulations. This comparison of modeling approaches was intended to gain insight in the effect of articular surface and ligament representations on calculated joint kinematics. Using these insights, kinematic models of the more distal joints in the foot were developed and validated next. Subsequently, the models were subjected to an in-depth analysis to get insight in the effect of the model parameters on the simulated kinematics and to learn how the assumptions and steps in model construction contribute to the modeling error. Finally, the models were applied in practice in order to illustrate how they can be used for applications in orthopedics. More specifically, we studied the kinematic behavior of two types of ankle implants and investigated how ligament properties and articular surface geometry define ankle kinematics.