General parametric model of the body of the total hip endoprosthesis

Abstract

The endoprostheses of the hip joint are the most commonly used group of implants in orthopedic surgery. The success of their application in the process of replacing natural hip joint with artificial depends, besides the patient related and surgical factors, which include the selection of the type of endoprosthesis and the extent of its adaptability to the patient. Because of that, endoprostheses adapted to the patient's measures, so-called custom made endprostheses, are used. The main challenge in their design is large number of influential factors on the shape and dimensions of the endoprosthesis, the long period of development, and high prices as a consequence of these factors. One of the directions of endoprosthesis design process improvement is the introduction of generalized computational models that enable the adaptation of the endoprosthesis to a specific patient's femur, taking into consideration all influential factors of the disease. This paper describes a general parametric model of the body of the hip endoprosthesis, which was developed by combining two methods of parametric modeling with the aim to implement all existing contributing factors and, also, facilitate introduction of the new ones. The main advantages of this model of endoprosthesis are: flexibility and simplicity which makes this model easy for application in a variety of CAD software systems.